NETWORK 1 SECURITY SOLUTIONS INC
SB-2/A, 1998-10-22
PREPACKAGED SOFTWARE
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<PAGE>
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 22, 1998
    
 
                                                     REGISTRATION NO.: 333-59617
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 2
                                       TO
                                   FORM SB-2
                             REGISTRATION STATEMENT
    
 
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                 (Name of small business issuer in its charter)
                         ------------------------------
 
<TABLE>
<S>                                     <C>                                     <C>
               DELAWARE                                  7372                                 11-3027591
   (State or Other Jurisdiction of           (Primary Standard Industrial                  (I.R.S. Employer
    Incorporation or Organization)           Classification Code Number)                Identification Number)
</TABLE>
 
                         ------------------------------
 
                       NETWORK-1 SECURITY SOLUTIONS, INC.
                                70 Walnut Street
                      Wellesley Hills, Massachusetts 02481
                                 (781) 239-8280
   (Address and Telephone Number of Registrant's Principal Executive Offices)
                         ------------------------------
 
                                  AVI A. FOGEL
                     President and Chief Executive Officer
                       Network-1 Security Solutions, Inc.
                                70 Walnut Street
                      Wellesley Hills, Massachusetts 02481
                                 (781) 239-8280
 
      (Name, Address and Telephone Number of Agent for Service of Process)
                         ------------------------------
 
                          COPIES OF COMMUNICATIONS TO:
                         ------------------------------
 
          SAM SCHWARTZ, ESQ.                     ROBERT J. MITTMAN, ESQ.
       Bizar Martin & Taub, LLP                   Tenzer Greenblatt LLP
     1350 Avenue of the Americas                  The Chrysler Building
       New York, New York 10019                    405 Lexington Avenue
      Telephone: (212) 265-8600                  New York, New York 10174
      Telecopier: (212) 581-8958                Telephone: (212) 885-5000
                                                Telecopier: (212) 885-5001
 
                         ------------------------------
 
                APPROXIMATE DATE OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
                         ------------------------------
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / / [      ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / / [      ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / / [      ]
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / / [      ]
                         ------------------------------
 
   
                        CALCULATION OF REGISTRATION FEE
    
   
<TABLE>
<CAPTION>
                                                                                                              PROPOSED
                                                                                            PROPOSED          MAXIMUM
                                                                                             MAXIMUM         AGGREGATE
                         TITLE OF EACH CLASS OF                            AMOUNT TO BE  OFFERING PRICE    OFFERING PRICE
                       SECURITIES BEING REGISTERED                          REGISTERED    PER SHARE (1)         (1)
<S>                                                                        <C>           <C>              <C>
Common Stock, par value $.01 per share...................................    1,955,000      $    6.00       $ 11,730,000
Underwriter's Warrants(3), each to purchase one share of Common Stock....      170,000      $    .001       $        170
Common Stock, par value $.01 per share issuable upon exercise of
Underwriter's Warrants(4)................................................      170,000      $    9.30(4)    $  1,581,000
Total....................................................................
 
<CAPTION>
 
                                                                            AMOUNT OF
                         TITLE OF EACH CLASS OF                            REGISTRATION
                       SECURITIES BEING REGISTERED                             FEE
<S>                                                                        <C>
Common Stock, par value $.01 per share...................................   $3,460.35
Underwriter's Warrants(3), each to purchase one share of Common Stock....   $     .05
Common Stock, par value $.01 per share issuable upon exercise of
Underwriter's Warrants(4)................................................   $  466.40
Total....................................................................   $3,926.80(5)
</TABLE>
    
 
   
(1) Estimated solely for the purpose of calculating the registration fee
    pursuant to Rule 457(o) of the Securities Act of 1933, as amended.
    
 
   
(2) Includes 255,000 shares of Common Stock issuable upon exercise of an option
    granted to the Underwriter to cover over-allotments of shares, if any.
    
 
   
(3) Pursuant to Rule 416, this Registration Statement also registers such
    indeterminate number of shares as may become issuable pursuant to the
    anti-dilution provisions of the Underwriter's Warrants.
    
 
   
(4) No fee due pursuant to Rule 457(g).
    
 
   
(5) Fee previously paid.
    
                         ------------------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                             CROSS-REFERENCE SHEET
 
<TABLE>
<CAPTION>
FORM SB-2 ITEM NUMBER AND CAPTION                                                 HEADING IN PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
       1.  Front of Registration Statement and Outside Front
             Cover of Prospectus................................  Outside Front Cover of Prospectus
       2.  Inside Front and Outside Back Cover Pages of
             Prospectus.........................................  Inside Front and Outside Back Cover
       3.  Summary Information and Risk Factors.................  Prospectus Summary; Risk Factors
       4.  Use of Proceeds......................................  Use of Proceeds
       5.  Determination of Offering Price......................  Risk Factors; Underwriting
       6.  Dilution.............................................  Dilution; Risk Factors
       7.  Selling Security Holders.............................  Not Applicable
       8.  Plan of Distribution.................................  Outside Front Cover Page of Prospectus
       9.  Legal Proceedings....................................  Business
      10.  Directors, Executive Officers, Promoters and Control
             Persons............................................  Risk Factors; Management
      11.  Security Ownership of Certain Beneficial Owners and
             Management.........................................  Principal Stockholders
      12.  Description of Securities............................  Description of Securities
      13.  Interest of Named Experts and Counsel................  Legal Matters; Experts
      14.  Disclosure of Commission Position on Indemnification
             for Securities Act Liabilities.....................  Description of Securities
      15.  Organization Within Last Five Years..................  Business; Certain Transactions
      16.  Description of Business..............................  Business
      17.  Management's Discussion and Analysis or Plan of
             Operation..........................................  Management's Discussion and Analysis of Financial
                                                                    Condition and Results of Operations
      18.  Description of Property..............................  Prospectus Summary; Risk Factors; Discussion and
                                                                    Analysis of Financial Results of Operations;
                                                                    Business
      19.  Certain Relationships and Related Transactions.......  Certain Transactions
      20.  Market for Common Equity and Related Stockholder
             Matters............................................  Risk Factors; Dilution; Management; Shares Eligible
                                                                    for Future Sale
      21.  Executive Compensation...............................  Management
      22.  Financial Statements.................................  Financial Statements
      23.  Change in and Disagreements with Accountants on
             Accounting and Financial Disclosure................  Not Applicable
</TABLE>
<PAGE>
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
   
                 PRELIMINARY PROSPECTUS DATED OCTOBER 22, 1998
    
 
                             SUBJECT TO COMPLETION
 
   
                                1,700,000 SHARES
    
 
                                     [LOGO]
 
                                  COMMON STOCK
 
    Prior to this offering, there has been no public market for the Common Stock
and there can be no assurance that any such market will develop. It is
anticipated that the Common Stock will be quoted on the Nasdaq SmallCap Market
under the symbol "NSSI." For a discussion of the factors considered in
determining the initial public offering price, see "Underwriting."
 
                            ------------------------
   
THE SECURITIES OFFERED HEREBY ARE SPECULATIVE AND INVOLVE A HIGH DEGREE OF RISK
  AND IMMEDIATE SUBSTANTIAL DILUTION AND SHOULD NOT BE PURCHASED BY INVESTORS
  WHO CANNOT AFFORD THE LOSS OF THEIR ENTIRE INVESTMENT. SEE "RISK FACTORS"
                COMMENCING ON PAGE 7 AND "DILUTION" ON PAGE 21.
    
                            ------------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
     EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
        SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
                THIS PROSPECTUS. ANY REPRESENTATION TO THE
                      CONTRARY IS A CRIMINAL OFFENSE.
 
   
<TABLE>
<CAPTION>
                                                           PRICE            UNDERWRITING          PROCEEDS
                                                             TO            DISCOUNTS AND             TO
                                                           PUBLIC          COMMISSIONS(1)        COMPANY(2)
<S>                                                  <C>                 <C>                 <C>
Per Share..........................................        $6.00                $.60               $5.40
Total(3)...........................................     $10,200,000          $1,020,000          $9,180,000
</TABLE>
    
 
   
(1) In addition, the Company has agreed to pay to the Underwriter a 3%
    nonaccountable expense allowance and to sell to the Underwriter warrants
    (the "Underwriter's Warrants") to purchase up to 170,000 shares of Common
    Stock. The Company has also agreed to indemnify the Underwriter against
    certain liabilities under the Securities Act of 1933, as amended. See
    "Underwriting."
    
 
   
(2) Before deducting expenses estimated at $1,035,000, including the
    Underwriter's nonaccountable expense allowance in the amount of $306,000
    ($351,900 if the Underwriter's over-allotment option is exercised in full),
    payable by the Company.
    
 
   
(3) The Company has granted the Underwriter an option, exercisable within 45
    days from the date of this Prospectus, to purchase up to an additional
    255,000 shares of Common Stock on the same terms as set forth above, solely
    for the purpose of covering over-allotments, if any. If the Underwriter's
    over-allotment option is exercised in full, the price to public,
    underwriting discounts and commissions, and proceeds to Company will be
    $11,730,000, $1,173,000 and $10,557,000, respectively. See "Underwriting."
    
 
    The shares of Common Stock are being offered, subject to prior sale, when,
as and if delivered to, and accepted by the Underwriter and subject to approval
of certain legal matters by counsel and to certain other conditions. The
Underwriter reserves the right to withdraw, cancel or modify the offering and to
reject any order in whole or in part. It is expected that delivery of
certificates representing the shares will be made against payment therefor at
the offices of the Underwriter, 650 Fifth Avenue, New York, New York 10019, on
or about            , 1998.
 
                            ------------------------
 
                           WHALE SECURITIES CO., L.P.
 
                The date of this Prospectus is            , 1998
<PAGE>
                                [GATEFOLD COVER]
 
       [GRAPHIC ILLUSTRATING DEPLOYMENT OF THE COMPANY'S FIREWALL/PLUS
       PRODUCTS THROUGHOUT AN ENTERPRISE'S COMPUTER NETWORK, OFFERING
       PROTECTION FOR SUCH NETWORKS AGAINST INTERNAL AND EXTERNAL
       SECURITY THREATS.]
 
The Company's FIREWALL/PLUS family of security software products enables an
organization to protect and secure its computer networks from internal and
external security threats. Specific features include:
 
ENTERPRISE-WIDE DEPLOYMENT. Unlike most other firewall solutions which focus on
an enterprise's connection to the Internet, FIREWALL/PLUS may be used throughout
the enterprise; as a perimeter firewall to control access to and from the
Internet, between internal networks to protect the network from attacks from
within, and on application servers and clients PCs to protect data.
 
MULTI-PROTOCOL CAPABILITY. FIREWALL/PLUS provides multi-protocol filtering not
available from network security products offered by other firewall vendors.
FIREWALL/PLUS filters TCP/IP plus all other commonly used network transport
protocols, such as IPX, SNA, DECnet and NetBEUI.
 
MULTI-LAYER SECURITY. FIREWALL/PLUS' Interceptor Shim and security filter engine
technology introduce a security layer between the network hardware drivers and
the Windows NT operating system by filtering all network traffic before it
reaches Windows NT.
 
ADVANCED FILTERING SYSTEM. FIREWALL/PLUS incorporates frame, packet, application
layer, proxy, and stateful inspection filtering capabilities. The Company
believes that its hybrid approach to filtering allows the Company to offer a
firewall product that maximizes security without sacrificing performance.
 
                         ------------------------------
 
    FIREWALL/PLUS is a trademark of the Company. All other trademarks or
tradenames referred to in this Prospectus are the property of their respective
owners.
 
    CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS ON
NASDAQ, IN THE OVER-THE-COUNTER MARKET OR OTHERWISE WHICH STABILIZE, MAINTAIN OR
OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK. SPECIFICALLY, THE UNDERWRITER
MAY OVER-ALLOT IN CONNECTION WITH THE OFFERING AND MAY BID FOR AND PURCHASE
SHARES OF COMMON STOCK IN THE OPEN MARKET. FOR A DESCRIPTION OF THESE
ACTIVITIES, SEE "UNDERWRITING."
<PAGE>
                               [INSIDE GATEFOLD]
 
                 [FOUR PICTURES IN CLOCKWISE ORDER AS FOLLOWS]
 
    [GRAPHIC ILLUSTRATING DEPLOYMENT OF THE COMPANY'S FIREWALL/PLUS ENTERPRISE
VERSION WHICH RESIDES ON THE PERIMETER OF A COMPUTER NETWORK OFFERING A BARRIER
BETWEEN THE ENTERPRISE AND THE INTERNET.]
 
    [The following text appears to the right of the graphic.]
 
    - Sits on the perimeter of a network, offering a barrier between the
      enterprise and the Internet.
 
    - Incorporates Virtual Private Network (VPN) technology to enable secure
      communications between networks across the Internet, utilizing all
      commonly used network transport protocols.
 
    - May be operated in a transparent mode and therefore cannot be identified
      for attack.
 
    [GRAPHIC ILLUSTRATING DEPLOYMENT OF THE COMPANY'S FIREWALL/PLUS ENTERPRISE
VERSION BEING USED AS AN INTERNAL GATEWAY SECURITY DEVICE TO PROTECT
SUB-NETWORKS FROM UNAUTHORIZED ATTACK ORIGINATING FROM OTHER SUB-NETWORKS ON THE
NETWORK.]
 
    [The following text appears to the right of the graphic.]
 
    - Controls access by users to sub-networks throughout the enterprise
      network.
 
    - Protects against attacks originating from within the internal enterprise
      network, where security breaches often originate.
 
    - Supports multiple network transport protocols, including IP, IPX, SNA,
      DECnet, and NetBEUI.
<PAGE>
    [GRAPHIC ILLUSTRATING DEPLOYMENT OF THE COMPANY'S FIREWALL/PLUS CLIENT
VERSION, WHICH PROTECTS A WINDOWS NT WORKSTATION AGAINST INTERNAL AND EXTERNAL
NETWORK ATTACKS.]
 
    [The following text appears to the right of the graphic.]
 
    - Protects the Windows NT workstation on which it resides against internal
      and external network attacks.
 
    - Protects highly sensitive Windows NT workstations (e.g. CEO, human
      resources, payroll and accounting).
 
    - Supports multi-protocol environments commonly used in enterprise networks.
 
    [GRAPHIC ILLUSTRATING DEPLOYMENT OF THE COMPANY'S FIREWALL/PLUS SERVER
VERSION WHICH RESIDES ON A WINDOWS NT APPLICATION SERVER PREVENTING UNAUTHORIZED
ACCESS BY INTERNAL NETWORK USERS.]
 
    [The following text appears to the right of the graphic.]
 
    - Installs directly on a Windows NT application server without interfering
      with the normal operation of the server.
 
    - Prevents unauthorized access to a secured Windows NT server by internal
      users, where security breaches often originate.
 
    - Protects sensitive enterprise systems such as database servers, key escrow
      securities, digital certificate servers and authentication servers.
 
    - Security provided for all commonly used network transport protocols.
<PAGE>
                               PROSPECTUS SUMMARY
 
   
    THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE MORE
DETAILED INFORMATION AND FINANCIAL STATEMENTS, INCLUDING THE NOTES THERETO,
APPEARING ELSEWHERE IN THIS PROSPECTUS. EXCEPT AS OTHERWISE INDICATED, ALL
INFORMATION IN THIS PROSPECTUS, INCLUDING PER SHARE DATA AND INFORMATION
RELATING TO THE NUMBER OF SHARES OUTSTANDING, (I) HAS BEEN ADJUSTED TO REFLECT A
1-FOR-1.61083 REVERSE STOCK SPLIT OF THE COMMON STOCK EFFECTED ON JULY 20, 1998,
(II) GIVES EFFECT TO THE CONVERSION OF THE OUTSTANDING SHARES OF SERIES B
CONVERTIBLE PREFERRED STOCK INTO 310,399 SHARES OF COMMON STOCK, THE ISSUANCE OF
562,836 SHARES OF SERIES C CONVERTIBLE PREFERRED STOCK (THE "SERIES C PREFERRED
STOCK") IN EXCHANGE FOR THE CANCELLATION OF PROMISSORY NOTES, INCLUDING ACCRUED
INTEREST, OF $2,954,888, AND THE ISSUANCE OF AN AGGREGATE OF 64,167 SHARES OF
COMMON STOCK IN CONNECTION WITH THE ACQUISITION OF COMMHOME SYSTEMS CORPORATION
(THE "COMMHOME ACQUISITION") AND SATISFACTION OF CERTAIN INDEBTEDNESS OF
COMMHOME, ALL UPON CONSUMMATION OF THIS OFFERING, AND (III) ASSUMES THE
CONVERSION OF 562,836 SHARES OF SERIES C PREFERRED STOCK INTO 562,836 SHARES OF
COMMON STOCK AND NO EXERCISE OF THE UNDERWRITER'S OVER-ALLOTMENT OPTION TO
PURCHASE UP TO 255,000 ADDITIONAL SHARES OF COMMON STOCK. SEE
"BUSINESS--COMMHOME SYSTEM CORPORATION ACQUISITION," "CERTAIN TRANSACTIONS,"
"DESCRIPTION OF SECURITIES--PREFERRED STOCK" AND NOTE J TO NOTES TO FINANCIAL
STATEMENTS.
    
 
    CERTAIN STATEMENTS CONTAINED HEREIN UNDER "PROSPECTUS SUMMARY," "RISK
FACTORS," "USE OF PROCEEDS," "MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS" AND "BUSINESS" INCLUDING, WITHOUT
LIMITATION, STATEMENTS CONCERNING THE COMPANY'S STRATEGY AND GROWTH PLANS,
CONTAIN CERTAIN FORWARD-LOOKING STATEMENTS CONCERNING THE COMPANY'S OPERATIONS,
ECONOMIC PERFORMANCE AND FINANCIAL CONDITION. BECAUSE SUCH STATEMENTS INVOLVE
RISKS AND UNCERTAINTIES, ACTUAL RESULTS MAY DIFFER MATERIALLY FROM THOSE
EXPRESSED OR IMPLIED BY SUCH FORWARD LOOKING STATEMENTS. FACTORS THAT COULD
CAUSE SUCH DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED UNDER
"RISK FACTORS."
 
                                  THE COMPANY
 
    Network-1 Security Solutions, Inc. (the "Company") develops, markets,
licenses and supports a family of network security software products designed to
provide comprehensive security to computer networks, including Internet based
systems and internal networks and computing resources. The Company's
FIREWALL/PLUS family of security software products enables an organization to
protect its computer networks from internal and external attacks and to secure
organizational communications over such internal networks and the Internet. The
Company also offers its customers a full range of consulting services in network
security and network design and support in order to build, maintain and enhance
customer relationships and increase the demand for its software products.
 
    The FIREWALL/PLUS family of security solutions is designed to protect
against Internet and intranet (internal networks utilizing Internet technology
and applications based upon TCP/IP--the Internet network transport protocol)
based security threats and to address security needs that arise from within
internal networks that often utilize other network transport protocols besides
TCP/IP including, among others, Novell's IPX, Digital Equipment's DECnet and
IBM's SNA. The Company's FIREWALL/PLUS family of firewall products operates on
the Microsoft Windows NT operating system platform. FIREWALL/PLUS' proprietary
Interceptor Shim and filter engine software technology, with its unique ability
to handle and filter all commonly used network transport protocols, provide
organizations with a highly secure and flexible security solution. Additionally,
unlike most other firewall solutions which focus on an enterprise's connection
to the Internet, the FIREWALL/PLUS solution can be deployed throughout the
enterprise; at the perimeter to control access to and from the Internet, between
internal networks and on application servers and desktop PCs to protect data
residing on such servers and PCs. FIREWALL/PLUS for Windows NT received the 1997
Internet and Electronic Commerce Conference award for "Best Intranet Solution"
and the 1997 ENT Magazine Readers Choice Award for "Best NT Firewall."
 
    As a result of the explosive growth in network computing and Internet use
(as well as use of intranets and extranets), protection of an organization's
network and data has become a significant economic
 
                                       3
<PAGE>
concern for businesses. According to the 1997 Annual Information Week/Ernst &
Young LLP Information Security Survey of information technology managers and
professionals, 42% of the respondents reported malicious acts from external
sources, as compared to 16% in the prior year, and 43% of the respondents
reported malicious acts by employees as compared to 29% in the prior year.
According to FBI estimates, U.S. companies suffer estimated losses of $5 to $10
billion per year as a result of unauthorized access to information and data.
According to the 1998 Computer Security Institute/FBI Computer Crime and
Security Survey, 44% of the respondents reported unauthorized access by
employees. The Company believes that securely segmenting internal network areas
and computing resources from unauthorized access will become paramount to
insuring the integrity of both the internal network and an organization's
intranet and extranet (intranets which allow access to one or more users outside
of the internal network) resources.
 
    In a Windows NT based environment, it is typical for multiple network
transport protocols to co-exist, as Windows NT comes pre-equipped with TCP/IP,
IPX (Novell), NetBEUI (LAN Manager) and AppleTalk. In addition, certain
applications require the use of non-TCP/IP protocols to operate between
sub-networks within a network. The Company believes that multiple network
transport protocols will remain prevalent in computing environments because of
the large installed base of non-TCP/IP based computer systems and applications.
As a result, the Company believes that its FIREWALL/PLUS technology offers
significant advantages as a security product for computer networks because of
its unique ability to filter all commonly used network transport protocols and
reside in multiple locations throughout an organization's network.
 
    The Company intends to pursue an aggressive growth strategy and to focus its
efforts on marketing its FIREWALL/PLUS family of network security products. Key
elements of the Company's strategy are to:
 
    - Provide comprehensive network security solutions by developing, marketing
      and supporting a family of network security products to address a broad
      range of security issues confronting computer networks and computing,
      including concerns arising from allowing access to the Internet as well as
      concerns relating to the security of internal networks.
 
    - Emphasize internal network security because of the ability of
      FIREWALL/PLUS to filter a multitude of network transport protocols which
      are common in many organizations. The Company intends to devote a
      significant portion of the proceeds of this offering for sales and
      marketing toward educating potential end users and third-party
      distributors as to the need to protect networks and computing resources
      from unauthorized access and attacks from within an internal network and
      the capabilities and benefits of the Company's products.
 
    - Implement a marketing plan which includes a multi-channel distribution
      strategy which emphasizes establishing and maintaining third-party
      distributor relationships with systems integrators, VARs, OEMs and
      resellers in the United States and internationally.
 
    - Increase sales of FIREWALL/PLUS by leveraging relationships with
      consulting clients.
 
    Since its inception, the Company has incurred significant losses. The future
success of the Company is largely dependent upon its FIREWALL/PLUS family of
software products achieving market acceptance. There can be no assurance that
the Company will be able to successfully implement its marketing strategy,
achieve significant market acceptance of its FIREWALL/PLUS products or achieve
profitable operations.
 
    The Company was incorporated under the laws of the State of Delaware in July
1990. Unless the context requires otherwise, all references to the Company
include the Company's wholly-owned subsidiary, Network-1 Acquisition Corp.,
which was formed to acquire CommHome Systems Corporation upon the consummation
of this offering. The Company's executive offices are located at 70 Walnut
Street, Wellesley Hills, Massachusetts 02481 and its telephone number at that
address is (781) 239-8280. The Company intends to relocate its executive offices
to a new facility in the Boston, Massachusetts area following the consummation
of this offering. The Company's website can be found at
http://www.network-1.com.
 
                                       4
<PAGE>
                                  THE OFFERING
 
   
<TABLE>
<S>                                 <C>
Common Stock offered..............  1,700,000 shares
 
Common Stock to be outstanding
  after the offering..............  4,925,467 shares(1)(2)
 
Use of Proceeds...................  The Company intends to use the net proceeds of this
                                    offering for sales and marketing; software development;
                                    payment of trade payables; repayment of indebtedness;
                                    purchase of computer equipment; establishing a new
                                    office facility; and the balance for working capital and
                                    general corporate purposes.
 
Risk Factors......................  The securities offered hereby involve a high degree of
                                    risk and immediate substantial dilution to new investors
                                    and should not be purchased by investors who cannot
                                    afford the loss of their entire investment. See "Risk
                                    Factors" and "Dilution."
 
Proposed Nasdaq SmallCap Market
  symbol..........................  NSSI
</TABLE>
    
 
- ------------------------
 
   
(1) Includes 562,836 shares of Common Stock issuable upon conversion of the
    562,836 shares of Series C Preferred Stock to be issued in exchange for the
    cancellation of promissory notes, including accrued interest, of $2,954,888
    upon the consummation of this offering. Such shares of Common Stock will be
    outstanding only if the holders elect to convert such shares into shares of
    Common Stock. If the Underwriter exercises the over-allotment option in
    whole or in part, the Company will use 50% of the net proceeds therefrom to
    repay a portion of the promissory notes and, as a result, less shares of
    Series C Preferred Stock will be issued. If the Underwriter exercises the
    over-allotment option in full, $665,550 of the net proceeds therefrom will
    be used to repay a portion of the promissory notes and 126,771 shares of
    Series C Preferred Stock will not be issued. See "Certain Transactions" and
    "Description of Securities--Preferred Stock."
    
 
   
(2) Does not include: (i) 170,000 shares of Common Stock reserved for issuance
    upon exercise of the Underwriter's Warrants; (ii) 855,216 shares of Common
    Stock reserved for issuance upon exercise of stock options granted under the
    Company's 1996 Stock Option Plan (the "Stock Option Plan"); (iii) 194,784
    shares of Common Stock reserved for issuance upon exercise of stock options
    available for future grant under the Stock Option Plan; and (iv) 630,886
    shares of Common Stock reserved for issuance upon exercise of other
    outstanding warrants and options. See "Management--Stock Option Plan,"
    "Description of Securities," "Certain Transactions" and "Underwriting."
    
 
                            ------------------------
 
   
    NOTICE TO CALIFORNIA INVESTORS: Each purchaser of Common Stock in California
must be an "accredited investor" as that term is defined in Rule 501(a) of
Regulation D promulgated under the Securities Act of 1933, as amended (the
"Securities Act"), or satisfy one of the following suitability standards; (i)
minimum gross income of $65,000 and a net worth (exclusive of home, home
furnishings and automobiles) of $250,000; or (ii) minimum net worth (exclusive
of home, home furnishings and automobiles) of $500,000.
    
 
   
    NOTICE TO NEW JERSEY, OHIO, SOUTH CAROLINA AND WASHINGTON INVESTORS: Each
purchaser of Common Stock in New Jersey, Ohio, South Carolina and Washington
must be an "accredited investor" as that term is defined in Rule 501(a) of
Regulation D promulgated under the Securities Act.
    
 
                                       5
<PAGE>
                         SUMMARY FINANCIAL INFORMATION
 
    The summary financial information set forth below is derived from and should
be read in conjunction with the financial statements, including the notes
thereto, and "Management's Discussion and Analysis of Financial Condition and
Results of Operations," contained elsewhere in this Prospectus.
 
STATEMENT OF OPERATIONS DATA:
 
<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31,      SIX MONTHS ENDED JUNE 30,
                                                         ----------------------------  ---------------------------
                                                             1996           1997           1997          1998
                                                         -------------  -------------  ------------  -------------
<S>                                                      <C>            <C>            <C>           <C>
Total revenues.........................................  $   1,027,000  $   2,369,000  $  1,427,000  $     902,000
Loss from operations...................................     (4,239,000)    (1,837,000)     (640,000)    (1,552,000)
Net loss...............................................     (4,499,000)    (2,390,000)     (781,000)    (1,990,000)
Loss per share (1).....................................          (2.46)         (1.29)         (.40)         (1.17)
Weighted average number of shares
  outstanding..........................................      1,825,163      1,855,244     1,934,334      1,699,120
</TABLE>
 
BALANCE SHEET DATA:
 
   
<TABLE>
<CAPTION>
                                                                 DECEMBER 31, 1997          JUNE 30, 1998
                                                                 -----------------  -----------------------------
                                                                      ACTUAL           ACTUAL      AS ADJUSTED(2)
                                                                 -----------------  -------------  --------------
<S>                                                              <C>                <C>            <C>
Cash and cash equivalents......................................    $      60,000    $     634,000  $    8,349,000
Working capital (deficit)......................................         (661,000)      (2,429,000)      8,187,000
Total assets...................................................        2,404,000        3,129,000      10,494,000
Total liabilities..............................................        2,479,000        3,707,000         806,000
Accumulated deficit............................................       (7,470,000)      (9,460,000)    (10,758,000)
Total stockholders' equity (deficit)...........................          (75,000)        (578,000)      9,688,000
</TABLE>
    
 
- ------------------------
 
(1) See Notes A and B to Notes to Financial Statements for an explanation of
    shares used in net loss per share calculations.
 
   
(2) Gives effect to (i) the sale of 1,700,000 shares of Common Stock offered
    hereby and the application of the estimated net proceeds therefrom,
    including the repayment of promissory notes, plus accrued interest, of
    $585,000, (ii) the issuance of 562,836 shares of Series C Preferred Stock in
    exchange for the cancellation of promissory notes, plus accrued interest, of
    $2,954,888, (iii) the incurrence of aggregate non-cash charges estimated to
    be $668,000 relating to the amortization of the debt discount on the
    promissory notes described in (i) and (ii) above, upon consummation of this
    offering, (iv) the issuance of an aggregate of 64,167 shares of Common
    Stock, upon consummation of this offering, in connection with the CommHome
    Acquisition and the satisfaction of an aggregate of $105,000 of indebtedness
    of CommHome owed to certain officers of the Company, and a charge related to
    the CommHome Acquisition for purchased research and development of $469,000
    and (v) the issuance of 13,220 shares of Common Stock in October 1998 for
    services rendered valued at $79,320 (such adjustment, together with the
    adjustments described in (ii) through (iv) above, collectively the "Offering
    Adjustments"). See "Use of Proceeds," "Business--CommHome Systems
    Corporation Acquisition," "Certain Transactions" and "Capitalization."
    
 
                                       6
<PAGE>
                                  RISK FACTORS
 
    AN INVESTMENT IN THE SHARES OF COMMON STOCK OFFERED HEREBY IS SPECULATIVE
AND INVOLVES A HIGH DEGREE OF RISK AND SHOULD NOT BE PURCHASED BY ANYONE WHO
CANNOT AFFORD THE LOSS OF THEIR ENTIRE INVESTMENT. EACH PROSPECTIVE INVESTOR
SHOULD CAREFULLY CONSIDER THE FOLLOWING RISK FACTORS AS WELL AS THE OTHER
INFORMATION SET FORTH IN THIS PROSPECTUS IN EVALUATING AN INVESTMENT IN THE
SHARES OF COMMON STOCK OFFERED HEREBY. THIS PROSPECTUS CONTAINS FORWARD-LOOKING
STATEMENTS BASED UPON CURRENT EXPECTATIONS THAT INVOLVE RISKS AND UNCERTAINTIES.
THE COMPANY'S ACTUAL RESULTS AND THE TIMING OF CERTAIN EVENTS MAY DIFFER
MATERIALLY FROM THOSE DISCUSSED IN SUCH FORWARD-LOOKING STATEMENTS AS A RESULT
OF CERTAIN FACTORS, INCLUDING, BUT NOT LIMITED TO, THOSE SET FORTH IN THE
FOLLOWING RISK FACTORS AND ELSEWHERE IN THIS PROSPECTUS.
 
   
    LIMITED RELEVANT OPERATING HISTORY; SIGNIFICANT AND CONTINUING LOSSES;
SIGNIFICANT ACCUMULATED DEFICIT; EXPLANATORY PARAGRAPH IN INDEPENDENT PUBLIC
ACCOUNTANT'S REPORT RELATING TO THE COMPANY'S ABILITY TO CONTINUE AS A GOING
CONCERN. Although the Company was organized in July 1990, it was engaged
primarily in providing network consulting and training services through 1994 and
did not commence marketing of its first FIREWALL/PLUS product until June 1995.
Accordingly, the Company has a limited relevant operating history as a software
developer upon which an evaluation of its prospects and future performance can
be made. Such prospects must be considered in light of the risks, expenses and
difficulties frequently encountered in the operation and expansion of a new
business and the shift from research and product development to
commercialization of products based on rapidly changing technologies in a highly
specialized and emerging market. Since inception, the Company has incurred
significant net losses, including net losses of $4,499,000, $2,390,000 and
$1,990,000 for the years ended December 31, 1996, December 31, 1997 and the six
months ended June 30, 1998, respectively. At June 30, 1998, the Company had an
accumulated deficit of $9,460,000 and, since June 30, 1998, the Company has
continued to incur significant and increasing losses. The Company will also
incur aggregate non-cash charges upon consummation of this offering of
approximately $1,137,000 relating to (i) the amortization of debt discount with
respect to $3,250,000 principal amount promissory notes which will be repaid or
cancelled in exchange for shares of Series C Preferred Stock, upon consummation
of this offering and (ii) purchased research and development in connection with
the CommHome Acquisition. In addition, the Company will incur additional
non-cash charges of $572,000 over the vesting period related to stock options
issued in May 1998 to Avi A. Fogel, President and Chief Executive Officer of the
Company. Inasmuch as the Company intends to increase its level of activities
following the consummation of this offering and will be required to make
significant up-front capital expenditures in connection with its sales and
marketing and continuing research and product development efforts, the Company
anticipates that losses will continue until such time, if ever, as the Company
is able to attain sales levels sufficient to support its operations. There can
be no assurance that the Company will ever achieve significantly increased
revenues or profitable operations. The Company's independent auditors have
included an explanatory paragraph in their report on the Company's financial
statements for the years ended December 31, 1996 and December 31, 1997, stating
that certain factors raise substantial doubt about the Company's ability to
continue as a going concern. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations," "Certain Transactions" and
Financial Statements.
    
 
    SIGNIFICANT CAPITAL REQUIREMENTS; WORKING CAPITAL DEFICIT; DEPENDENCE ON
PROCEEDS FOR PLAN OF OPERATION; CONTINUING NEED FOR ADDITIONAL FINANCING. The
Company's capital requirements have been and will continue to be significant,
and its cash requirements have been exceeding its cash flow from operations. At
June 30, 1998, the Company had a working capital deficit of $2,429,000. As a
result, the Company has been substantially dependent on private sales of equity
and debt securities to fund its operations. The Company is dependent on the
proceeds of this offering to implement its business plan and finance its working
capital requirements. The Company anticipates, based on currently proposed plans
and assumptions relating to the implementation of its business plan (including
the timetable of, costs and expenses associated with, and success of, its
marketing efforts), that the net proceeds of this offering, together with
projected revenues from operations, will be sufficient to satisfy the Company's
operations and capital requirements for
 
                                       7
<PAGE>
approximately twelve months following the consummation of this offering. There
can be no assurance, however, that such funds will not be expended prior thereto
due to unanticipated changes in economic conditions or other unforeseen
circumstances. In the event the Company's plans change or its assumptions change
or prove to be inaccurate (due to unanticipated expenses, difficulties, delays
or otherwise) or the net proceeds of this offering and projected revenues
otherwise prove to be insufficient to fund the implementation of the Company's
business plan or working capital requirements, the Company could be required to
seek additional financing sooner than currently anticipated. The Company has no
current arrangements with respect to any additional financing. Consequently,
there can be no assurance that any additional financing will be available to the
Company when needed, on commercially reasonable terms or at all. Any inability
to obtain additional financing when needed would have a material adverse effect
on the Company, requiring it to curtail and possibly cease its operations. In
addition, any additional equity financing may involve substantial dilution to
the interests of the Company's then existing stockholders. See "Use of Proceeds"
and "Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
    UNCERTAINTY OF MARKET ACCEPTANCE OF PRODUCTS. The future success of the
Company is largely dependent upon market acceptance of its FIREWALL/PLUS family
of software products. The network security market is at an early stage of
development and is rapidly evolving. Accordingly, demand for the Company's
products and market acceptance are subject to a high level of uncertainty. While
the Company believes that its FIREWALL/PLUS family of software products offers
advantages over competing products for network security, revenue from licenses
of FIREWALL/PLUS products since introduction (June 1995) through June 30, 1998
have been only $2,561,000, including a non-refundable prepaid royalty of
$500,000. There can be no assurance that FIREWALL/PLUS will gain market
acceptance. Revenues from such products depend on a number of factors, including
the influence of market competition, technological changes in the network
security market, the Company's ability to design, develop and introduce
enhancements on a timely basis, and the ability of the Company to successfully
establish and maintain distribution channels. Moreover, there are commercially
available competitive products, offered by companies with significantly greater
resources than the Company, which have comparable or more favorable price
characteristics and which may be perceived to have performance characteristics
comparable to the Company's products. In addition, the Company anticipates the
introduction of additional competitive products, particularly if the demand for
network security products continues to increase. Existing and future competition
may make it more difficult to achieve market acceptance for FIREWALL/PLUS.
Additionally, potential customers may be reluctant to purchase the Company's
products due to significant investments in other network security products.
Consequently, although the Company intends to utilize a significant portion of
the proceeds of this offering to expand its marketing and sales activities,
there can be no assurance that such funds will be sufficient, that the Company's
increased marketing efforts and expenditures will result in significant levels
of revenue or that the FIREWALL/PLUS family of products will achieve significant
market acceptance. Moreover, a highly publicized breach of network security
involving the Company's products could adversely affect public perception of,
and confidence in, the Company's products. See "Use of Proceeds,"
"Business--Sales and Marketing" and "Business--Competition."
 
   
    LIMITED MARKETING CAPABILITIES AND EXPERIENCE; DEPENDENCE UPON THIRD-PARTY
MARKETING ARRANGEMENTS. The Company has not yet undertaken significant marketing
efforts relating to product commercialization, has limited marketing experience
and has limited financial, personnel and other resources to undertake extensive
marketing activities independently. Accordingly, the Company has relied and
intends to continue to rely to a large extent on arrangements with third parties
for the marketing and distribution of its products, including arrangements with
VARs, systems integrators, resellers, distributors and OEMs. The Company has
only recently entered into marketing arrangements with most of its distributors
and, to date, most of such arrangements have generated limited revenues. For the
year ended December 31, 1997 and the six months ended June 30, 1998, the
Company's five largest distributors accounted for an aggregate of approximately
28% and 25% of the Company's revenues, respectively. Trusted Information
Systems, Inc. ("TIS"), as a result of a $500,000 non-refundable pre-paid
royalty, Electronic Data Systems
    
 
                                       8
<PAGE>
   
Corporation ("EDS") and Atlantic Richfield Company and related entities ("ARCO")
accounted for 21%, 15% and 13%, of the Company's revenues, respectively, for the
year ended December 31, 1997, and The City of Hope, EDS and The Sabre Group,
Inc. accounted for 32%, 17% and 11% of the Company's revenues, respectively, for
the six months ended June 30, 1998. In October 1998, Network Associates, Inc.
(which acquired TIS) terminated the license agreement with the Company effective
December 31, 1998. Based on information provided by Network Associates, Inc.,
the Company does not anticipate receiving any additional royalties. The
Company's prospects will be dependent upon its ability to develop and maintain
strategic marketing relationships with additional third parties and upon the
marketing and distribution efforts of its third-party distributors. While the
Company believes that the third parties with which it enters into marketing
arrangements have an economic incentive to commercialize the Company's products,
the time and resources devoted to these activities will be contributed and
controlled by such third parties. Many of the Company's third-party distributors
represent various product lines, including those competing with the Company's
products. A decline in the prospects of key distributors could have an adverse
effect on the Company. There can be no assurance that the Company will be able,
for financial or other reasons, to finalize any additional third-party
distribution or marketing arrangements, maintain its existing marketing and
distribution arrangements or that any such arrangements will result in the
successful commercialization of the Company's products. See "Business--Sales and
Marketing."
    
 
   
    COMPETITION. The network security market in general, and the firewall
product market in particular, is characterized by intense competition and
rapidly changing business conditions, customer requirements and technologies.
The Company believes that the principal competitive factors affecting the market
for network security products include security effectiveness, scope of product
offerings, name recognition, product features, distribution channels, price,
ease of use and customer service and support. Currently, the Company's principal
competitors include AXENT Technologies Inc., Bay Networks, Inc. (a subsidiary of
Northern Telecom Limited), CheckPoint Software Technologies, Ltd., Cisco
Systems, Inc., Compaq Computer Corporation, Cyberguard Corp., International
Business Machines Corporation, ISS Group, Inc., Microsoft Corporation, Network
Associates, Inc. and Secure Computing Corporation. Due to the rapid expansion of
the network security market, the Company may face competition from new entrants
to the firewall product market. Most of the Company's current and potential
competitors have longer operating histories, greater name recognition, larger
installed customer bases and possess substantially greater financial, technical
and marketing and other competitive resources than the Company. As a result, the
Company's competitors may be able to adapt more quickly to new or emerging
technologies and changes in customer requirements or to devote greater resources
to the promotion and sale of their products than the Company. While the Company
believes that its firewall products do not compete against manufacturers of
other types of security products (such as encryption and authentication
products), there can be no assurance that potential customers will not perceive
the products of such other companies as substitutes for the Company's products.
In addition, certain of the Company's competitors may determine for strategic
reasons to consolidate, to substantially lower the price of their network
security products or to bundle their products with other products, such as
hardware or other enterprise software products. Accordingly, it is possible that
new competitors and alliances among competitors may emerge and rapidly acquire
significant market share. There can be no assurance that the Company's current
and potential competitors will not develop products that may be more effective
than the Company's current or future products or that the Company's products
would not be rendered obsolete or less marketable by evolving technologies or
changing consumer demands or that the Company will otherwise be able to compete
successfully. Increased competition for firewall products may result in price
reductions and reduced gross margins and may adversely effect the Company's
ability to gain market share, any of which would adversely affect the Company's
business, operating results and financial condition. See
"Business--Competition."
    
 
    RAPID TECHNOLOGICAL CHANGE; POTENTIAL PRODUCT OBSOLESCENCE. The network
security industry is characterized by rapid technological advances, increasingly
sophisticated and changing customer requirements, frequent new product
introductions and enhancements, new and continuously evolving network security
threats and attack methodologies and evolving industry standards in computer
hardware and software
 
                                       9
<PAGE>
technology. As a result, the Company must continually change and improve its
products in response to such advances and changes in operating systems,
application software, computer and communications hardware, networking software,
programming tools and computer language technology. The introduction of products
embodying new technologies and the emergence of new industry standards may
render existing products obsolete or unmarketable. The Company's future
operating results will depend upon the Company's ability to enhance its current
products and to develop and introduce new products on a timely basis that
address the increasingly sophisticated needs of the marketplace and that keep
pace with technological developments, new competitive product offerings and
emerging industry standards. There can be no assurance that the Company will be
successful in developing and marketing new products or
product enhancements that respond to technological change and evolving industry
standards and customer requirements, that the Company will not experience
difficulties that could delay or prevent the successful development,
introduction and marketing of these products, or that any new products and
product enhancements will adequately meet the requirements of the marketplace
and achieve market acceptance. In the event that the Company does not respond
adequately to the need to develop and introduce new products or enhancements of
existing products in a timely manner in response to changing market conditions
or customer requirements, the Company's business, operating results and
financial condition will be materially adversely affected. See
"Business--Product Development."
 
    UNPROVEN MARKET FOR INTERNAL NETWORK SECURITY PRODUCTS. Many of the
Company's competitors in the firewall market have largely devoted their
resources to the development and marketing of perimeter firewall products ("IP
Firewalls") designed primarily to protect an internal network from internet
based security threats or threats from within intranets. While TCP/IP is a
dominant network transport protocol, network environments often use other
network transport protocols such as Novell's IPX, Digital Equipment's DECnet and
IBM's SNA. The Company believes that the ability of the FIREWALL/PLUS technology
to filter all commonly used network transport protocols and reside in multiple
locations throughout the enterprise network offers significant advantages as a
security product for internal networks. However, the Company's limited sales to
date have not established that, in fact, this is a significant marketing
advantage. The Company's future success depends in large part on the Company's
ability to successfully market its technology and the increased awareness and
demand in the market for the need to address security threats that arise from
within internal networks which may require substantial marketing efforts and the
expenditure of significant funds. Furthermore, firewall vendors and other
vendors of network security products with substantially greater financial,
technical and marketing resources than the Company may modify existing security
products or develop new products which would address the internal network
security market. The Company's failure to successfully implement marketing
efforts emphasizing the internal network security market would have a material
adverse effect on its business, financial condition and results of operations in
the future. See "Business--Network-1 Strategy" and "Business--FIREWALL/PLUS
Technology."
 
    SIGNIFICANT FLUCTUATIONS IN QUARTERLY OPERATING RESULTS. The Company
anticipates significant quarterly fluctuations in its operating results in the
future. The Company generally ships orders for commercial products as they are
received and, as a result, does not have any material backlog. As a result,
quarterly revenues and operating results depend on the volume and timing of
orders received during the quarter, which are difficult to forecast. Operating
results may also fluctuate on a quarterly basis due to factors such as the
demand for the Company's products, purchasing patterns and budgeting cycles of
customers, the introduction of new products and product enhancements by the
Company or its competitors, market acceptance of new products introduced by the
Company or its competitors and the size, timing, cancellation or delay of
customer orders, including cancellation or delay in anticipation of new product
introduction or enhancement. Therefore, comparisons of quarterly operating
results may not be meaningful and should not be relied upon, nor will they
necessarily reflect the Company's future performance. Because of the foregoing
factors, it is likely that in some future quarters the Company's operating
results will be below the expectations of public market analysts and investors.
In such event, the price of the Common Stock
 
                                       10
<PAGE>
would likely be materially adversely affected. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations."
 
    PROPOSED EXPANSION; MANAGEMENT OF GROWTH; NEED FOR QUALIFIED
PERSONNEL. Following the consummation of this offering, the Company intends to
use a substantial portion of the proceeds to expand its current level of
operations and expects to significantly increase the number of its employees.
This growth will result in an increase in responsibilities placed upon the
Company's management and will place added pressures on the Company's operating
and financial resources. The Company's success will be dependent in part on its
ability to manage its growth, recruit additional management personnel, expand
its sales and marketing personnel and research and development staff, improve
its operational and financial systems, expand its customer support functions and
train, motivate and manage additional employees, monitor operations and control
costs. Competition with respect to the recruiting of highly qualified personnel
in the software industry is intense and many of the Company's competitors have
significantly greater resources than the Company. The Company's ability to
attract and assimilate new personnel will be critical to the Company's
performance and there can be no assurance that the Company will be successful in
attracting and retaining the personnel it requires to enhance its products,
develop new products and conduct its operations successfully. Moreover, the
Company may also use a portion of the net proceeds for the acquisition of
businesses, technologies or products which it believes are complimentary to
those of the Company, although there are currently no commitments or agreements
with respect to any such acquisitions as of the date of this prospectus, except
for the acquisition of CommHome. See "Business--CommHome Systems Corporation
Acquisition."
 
    LIMITED PROTECTION OF PROPRIETARY RIGHTS; RELIANCE ON TRADE SECRETS. The
Company's success is substantially dependent on its proprietary technologies.
The Company does not hold any patents and relies on copyright and trade secret
laws, non-disclosure agreements with employees, distributors and customers,
including "shrink wrap" license agreements that are not signed by the customer,
and technical measures to protect the ideas, concepts and documentation of its
proprietary technologies and know-how to protect its intellectual property
rights. Such methods may not afford complete protection, and there can be no
assurance that third parties will not independently develop substantially
equivalent or superior technologies or obtain access to the Company's
technologies, ideas, concepts and documentation. In addition, there can be no
assurance that any confidentiality agreements between the Company and its
employees, distributors or customers will provide meaningful protection for the
Company's proprietary information in the event of any unauthorized use or
disclosure. Furthermore, the Company may be subject to additional risk as it
enters into transactions in countries where intellectual property laws are not
well developed or are poorly enforced. Legal protection of the Company's rights
may be ineffective in such countries. The inability of the Company to protect
its proprietary technologies could have a material adverse effect on the
Company. The Company also licenses from a third-party certain proxy technology
which is incorporated into its FIREWALL/PLUS products. The Company is dependent
in part on its ability to continue to license such technology and any inability
of the Company to be able to continue to utilize such technology either as a
result of the Company's breach or the termination of the license agreement or
otherwise, in the absence of similar available technologies, could have a
material adverse effect on the Company.
 
    The Company received a U.S. trademark registration for the FIREWALL/PLUS
name in December 1996. Although the Company is not aware of any challenges to
the Company's rights to use this trademark, there can be no assurance that the
use of this mark would be upheld if challenged. See "Business--Proprietary
Rights."
 
    POTENTIAL INFRINGEMENT ON INTELLECTUAL PROPERTY RIGHTS OF OTHERS. Although
the Company believes that its technologies and products have been developed
independently and do not infringe upon the proprietary rights of others, there
can be no assurance that the Company's technologies and products do not and will
not so infringe or that third parties will not assert infringement claims
against the Company in the future. The Company is not aware of any patent
infringement charge or any violation of other proprietary rights
 
                                       11
<PAGE>
claimed by any third party relating to the Company or the Company's products. In
response to certain public statements made by CheckPoint Software Technologies,
Ltd. related to a patented technology referred to as "stateful inspection" (the
"Checkpoint Patent"), the Company retained patent counsel in April 1997 to
review the Checkpoint Patent as compared to the Company's intellectual property
and associated products. Based upon the opinion of the Company's intellectual
property counsel, the Company does not believe that the CheckPoint Patent will
have a material adverse effect on the Company. If, however, the Company's
technologies or products were deemed to infringe upon the Checkpoint Patent, or
if the Company's technologies or products were deemed to infringe upon the
proprietary rights of other third parties, the Company could become liable for
damages or be required to modify its products or to obtain a license. As the
number of and variety of security products being offered continue to increase
the functionality of such products may further overlap, which could result in
increased infringement claims by software developers, including infringement
claims against the Company with respect to future products. There can be no
assurance that the Company would be able to modify its products or obtain a
license in a timely manner, upon acceptable terms and conditions, or at all, or
that the Company will have the financial or other resources necessary to defend
a patent infringement or other proprietary rights infringement action. Failure
to do any of the foregoing could have a material adverse effect on the Company,
including possibly requiring the Company to cease marketing its products. See
"Business--Proprietary Rights."
 
    DEPENDENCE ON REVENUES FROM LIMITED PRODUCT LINE; NON-RECURRING
REVENUES. Since 1996, a substantial portion of the Company's revenues have been
derived from licenses of its FIREWALL/PLUS products. For the year ended December
31, 1997 and the six months ended June 30, 1998, revenues from FIREWALL/PLUS
products accounted for approximately 60% and 35% of the Company's revenues,
respectively. A decline in revenues from FIREWALL/PLUSproducts would have a
material adverse effect on the Company. In addition, revenues from the Company's
products are generally non-recurring in nature. There can be no assurance that
the Company will not remain dependent upon non-recurring revenues from
FIREWALL/PLUS products licensed to a limited number of customers, which revenues
could constitute a considerable portion of the Company's revenues. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
    DEPENDENCE ON CONTINUED GROWTH OF THE INTERNET AND INTERNAL NETWORKS. Since
the Company's products are designed to protect internal networks from
unauthorized access and attacks via the Internet and from within internal
networks, the Company's success is substantially dependent upon the widespread
acceptance and use of the Internet, intranets and extranets as effective means
of communication and commerce. Rapid growth in the use of and interest in the
Internet, intranets and extranets is a recent phenomenon, and there can be no
assurance that acceptance and use will continue to develop or that a
sufficiently broad base of consumers will adopt and continue to use the
Internet, intranets and extranets as means of communication and commerce. The
Internet may not be accepted as a viable commercial marketplace for a number of
reasons, including potentially inadequate development of the necessary network
infrastructure or delayed development of enabling technologies and performance
improvements. If use of the Internet does not continue to grow or grows more
slowly than expected, if the infrastructure for the Internet does not
effectively support growth that may occur, or if the Internet and online
services do not become a viable commercial marketplace, market demand for the
Company's products may not develop or be maintained. See "Business--Industry
Background."
 
    FOCUS ON WINDOWS NT PLATFORM. Currently, the Windows NT operating system is
the principal platform for the Company's FIREWALL/PLUS family of products.
According to a recent International Data Corporation survey, Windows NT
shipments are expected to assume a majority market share by 1999. While the
Windows NT platform is perceived to have security weaknesses, many of the
Company's competitors currently offer Windows NT based firewalls and the Company
believes that the use of Windows NT as the preferred operating system will
continue to grow dramatically over the next five years. In the event that demand
for Windows NT based firewalls declines, or other platforms become the preferred
platforms, and the Company is unable to adapt its products to the preferred
platforms on a
 
                                       12
<PAGE>
timely basis, the Company's business, financial condition and results of
operations may be materially adversely affected. See "Business--Industry
Background" and "Business--FIREWALL/PLUS Technology."
 
   
    POTENTIAL LIABILITY EXPOSURE. Since the Company's products are network
security products and are used to prevent unauthorized access to and attacks
upon critical enterprise information, the Company may be exposed to potential
liability claims for damage caused to a network as a result of an actual or
alleged failure of an installed product. Although the Company's license
agreements typically contain provisions that are designed to limit the Company's
exposure to potential product liability or related claims, including provisions
that limit the Company's liability for special, consequential or incidental
damages, there can be no assurance that such provisions will be enforceable
under the laws of applicable domestic or foreign jurisdictions. The Company's
consulting engagements often involve development, implementation and maintenance
of networking systems that are critical to the operations of its clients'
businesses. The Company's failure or inability to meet a client's expectations
in the performance of its services could harm the Company's business reputation
or result in a claim for substantial damages against the Company, regardless of
the Company's responsibility for such failure or inability. In addition, in the
course of performing services, the Company's personnel often gain access to
technologies and content which include confidential or proprietary client
information. Any unauthorized disclosure or use of such information could result
in a claim for substantial damages. The Company currently maintains product
liability insurance coverage in the amount of $2,000,000 that, subject to
customary exclusions, covers claims resulting from failure of the Company's
products or services to perform the function or to serve the purpose intended.
There can be no assurance that the Company's insurance will be sufficient to
cover potential claims or that adequate levels of coverage will be available in
the future at reasonable cost. A partially or completely uninsured successful
claim against the Company could have a material adverse effect on the Company.
See "Business--Proprietary Rights."
    
 
    RISK OF PRODUCT DEFECTS. Software products as complex as those offered by
the Company may contain undetected errors or result in failures when first
introduced or when new versions are released. In particular, the personal
computer hardware environment is characterized by a wide variety of non-standard
configurations that make pre-release testing for programming or compatibility
errors very difficult and time-consuming. Despite testing by the Company and by
current and potential customers, there can be no assurance that errors will not
be found in new products or enhancements after commencement of commercial
shipments. The occurrence of these errors could result in adverse publicity,
loss of or delay in market acceptance, claims by customers against the Company,
or could cause the Company to incur additional costs, any of which could have a
material adverse effect upon the Company's business, operating results and
financial condition. See "Business--Products" and "Business--Product
Development."
 
    LENGTHY SALES CYCLE. Licensing of the Company's software products generally
involves a significant commitment of capital by customers, with the attendant
delays frequently associated with large capital expenditures for complex
technology. Accordingly, the sales cycle for the Company's products can be
lengthy and generally commences at the time a prospective customer demonstrates
an interest in purchasing a FIREWALL/PLUS solution, typically includes a 30-day
free evaluation period and ends upon execution of a purchase order by the
customer. The length of the sales cycle varies depending on the type and
sophistication of the customer and the complexity of the operating system and
may extend for periods of six to nine months. As a result of the Company's
lengthy sales cycle, sales of the Company's products generally require the
Company to make expenditures and use significant resources prior to receipt, if
any, of corresponding revenues. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations."
 
    LICENSING IN FOREIGN MARKETS. The Company relies on software licenses to
foreign customers for a portion of its revenues. For the years ended December
31, 1996 and 1997 and the six months ended June 30, 1998, licensing of the
Company's software products to foreign customers accounted for approximately 7%,
16% and 2%, respectively, of the Company's revenues. The Company is seeking to
increase the
 
                                       13
<PAGE>
licensing of its products in foreign markets, but there can be no assurance that
the Company will be successful or that such markets will prove to be viable. To
the extent that the Company is able to successfully expand its licenses to
foreign markets, the Company will become increasingly subject to risks inherent
in foreign trade, including shipping delays, increased collection risks, trade
restrictions, export duties and tariffs and international political, regulatory
and economic developments, all of which could have an adverse effect on the
Company's operating margins and results of operations and exacerbate the risks
inherent in the Company's business. The Company may seek to limit its exposure
to the risk of currency fluctuations by engaging in foreign currency hedging
transactions that could expose the Company to substantial risk of loss. The
Company is not currently engaged in any currency hedging or other activities
involving derivative financial instruments. The Company has limited experience
in managing international transactions and has not yet formulated a strategy to
protect the Company against currency fluctuations. See "Business--Sales and
Marketing."
 
   
    DEPENDENCE UPON KEY PERSONNEL; NEW MANAGEMENT. The success of the Company
will be largely dependent on the personal efforts of Avi A. Fogel, President and
Chief Executive Officer, William Hancock, Chief Technology Officer, and Robert
P. Olsen, Vice President of Product Management. Although the Company has entered
into employment agreements with each of Messrs. Fogel, Hancock and Olsen, the
loss of the services of any of such officers could have a material adverse
effect on the Company's business and prospects. Prior to the consummation of
this offering, the Company will obtain "key-man" life insurance on each of the
lives of Messrs. Fogel and Olsen in the amount of $2,000,000. The Company has
been unable to obtain key-man life insurance on the life of Mr. Hancock due to
his health. Messrs. Fogel and Olsen as well as Murray P. Fish, Chief Financial
Officer, only joined the Company in May 1998. In addition, Joseph A. Donohue,
Vice President of Engineering, and Joseph D. Harris, Vice President of
International Sales, only joined the Company in July 1998 and August 1998,
respectively. There can be no assurance that such officers will become
sufficiently familiar with the Company's operations on a timely basis, or at
all. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations" and "Management."
    
 
   
    CONTROL BY MANAGEMENT. Upon consummation of this offering, the Company's
officers and directors, will beneficially own, in the aggregate, approximately
37.2% of the outstanding Common Stock. Accordingly, such persons will continue
to exert significant influence over the outcome of all matters submitted to a
vote of the holders of Common Stock, including the election of directors,
amendments to the Company's Certificate of Incorporation and approval of
significant corporate transactions. Such consolidation of voting power could
also have the effect of delaying, deterring or preventing a change in control of
the Company that might be beneficial to other stockholders. See "Management" and
"Principal Stockholders."
    
 
   
    BENEFITS TO RELATED PARTIES; USE OF PROCEEDS TO REPAY INDEBTEDNESS AND TRADE
PAYABLES. Upon consummation of this offering, the Company will issue 562,836
shares of Series C Preferred Stock (subject to adjustment in the event the
Underwriter's over-allotment option is exercised) in exchange for cancellation
of promissory notes, plus accrued interest, of approximately $2,954,888,
including 382,696 shares of Series C Preferred Stock to be issued to Applewood
Associates, L.P., a principal stockholder of the Company, in exchange for the
cancellation of promissory notes, plus accrued interest, of $2,009,156, an
aggregate of 74,081 shares of Series C Preferred Stock to be issued to Charles
P. Stevenson, Jr., a principal stockholder of the Company, and affiliated
entities in exchange for the cancellation of promissory notes, plus accrued
interest, of $388,926, and an aggregate of 40,521 shares of Series C Preferred
Stock to be issued to Corey M. Horowitz, Chairman of the Board of Directors and
a principal stockholder of the Company, and CMH Capital Management Corp., whose
sole stockholder is Mr. Horowitz, in exchange for the cancellation of promissory
notes, plus accrued interest, of $212,734. In addition, the Company has
allocated $585,000 (7.2%) of the net proceeds of this offering to repay
outstanding indebtedness, of which $102,811 will be paid to Charles P.
Stevenson, Jr. and affiliated entities, $75,000 will be paid to Applewood
Associates, L.P., and $56,235 will be paid to Corey M. Horowitz and CMH Capital
Management Corp. In
    
 
                                       14
<PAGE>
   
the event the Underwriter exercises the over-allotment option in whole or in
part, the Company will use 50% of the net proceeds to repay a portion of the
promissory notes, pro rata among the holders of such promissory notes, including
Applewood Associates, L.P. and Messrs. Stevenson and Horowitz and their
affiliated entities, and the number of shares of Series C Preferred Stock to be
issued to such persons will be proportionately reduced. In addition,
simultaneously with the consummation of this offering, the Company is acquiring
CommHome, of which Avi A. Fogel is President and Chief Executive Officer and a
principal stockholder, in exchange for 46,667 shares of Common Stock and the
assumption of approximately $200,000 of liabilities, of which $55,000 and
$50,000 are owed to Mr. Fogel and Robert P. Olsen, Vice President of Product
Management, respectively. Messrs. Fogel and Olsen have agreed to cancel such
obligations in exchange for the issuance of 9,167 and 8,333 shares of Common
Stock, respectively, upon the consummation of this offering. Furthermore, the
Company has allocated approximately $595,000 (7.3%) of the proceeds of this
offering to pay past due trade payables including approximately $95,000 of
CommHome trade payables. See "Use of Proceeds," "Management's Discussion and
Analysis of Financial Condition and Results of Operations," "Description of
Securities--Preferred Stock" and "Certain Transactions."
    
 
    POTENTIAL CONFLICTS OF INTERESTS AS TO PRIOR TRANSACTIONS. The Company has
from time to time entered into transactions with certain of its officers,
directors and principal stockholders and their affiliates. Although the Company
believes that transactions with such persons and their affiliates were on terms
no less favorable than could have been obtained from unaffiliated third parties,
the Company lacked sufficient disinterested independent directors at the time of
certain of such transactions. See "Certain Transactions."
 
   
    BROAD DISCRETION IN APPLICATION OF PROCEEDS. Approximately $1,685,000
(20.7%) of the estimated net proceeds of this offering has been allocated to
working capital and general corporate purposes. Management will have broad
discretion as to the application of such proceeds. Furthermore, to the extent
cash flow from operations is insufficient for such purposes, a portion of the
proceeds allocated to working capital may be utilized to pay a portion of the
salary of the Company's officers over the twelve months following the
consummation of this offering (such aggregate salaries estimated to be
approximately $840,000). See "Use of Proceeds."
    
 
   
    IMMEDIATE AND SUBSTANTIAL DILUTION. This offering involves an immediate and
substantial dilution of $4.46 per share (or 74.3%) between the adjusted net
tangible book value per share of Common Stock after this offering and the
initial public offering price per share. See "Dilution."
    
 
    NO DIVIDENDS. The Company has never paid any dividends on its Common Stock
and does not anticipate paying cash dividends in the foreseeable future. The
Company currently intends to retain all earnings for use in connection with the
operation and expansion of its business. The declaration and payment of future
dividends, if any, will be at the sole discretion of the Company's Board of
Directors and will depend upon a variety of factors, including future earnings,
if any, operations, capital requirements, the general financial condition of the
Company, the preferences of any series of Preferred Stock which may be
designated in the future, the general business conditions and future contractual
restrictions on payments of dividends, if any. See "Dividend Policy" and
"Description of Securities--Common Stock."
 
   
    SHARES ELIGIBLE FOR FUTURE SALE; REGISTRATION RIGHTS. Upon the consummation
of this offering, the Company will have 4,925,467 shares of Common Stock
outstanding (assuming the conversion of the outstanding shares of Series C
Preferred Stock into 562,836 shares of Common Stock), of which the 1,700,000
shares being offered hereby will be freely tradeable without restriction or
further registration under the Securities Act. All of the remaining 3,225,467
shares of Common Stock outstanding are "restricted securities," as that term is
defined in Rule 144 promulgated under the Securities Act, and in the future may
be sold only pursuant to an effective registration statement under the
Securities Act, in compliance with the exemption provisions of Rule 144, on
various dates following the date of this Prospectus, or pursuant to another
exemption under the Securities Act. The Company has granted certain registration
rights with respect to an aggregate of 1,126,750 shares of Common Stock, and the
Company
    
 
                                       15
<PAGE>
has granted the Underwriter demand and piggyback registration rights with
respect to the shares of Common Stock issuable upon exercise of the
Underwriter's Warrants. No prediction can be made as to the effect, if any, that
sales of such securities or the availability of such securities for sale will
have on the market prices prevailing from time to time. While all of the
Company's principal securityholders, officers and directors, have agreed not to
(i) sell or otherwise dispose of any shares of Common Stock in any public market
transaction (including pursuant to Rule 144) or (ii) exercise any registration
rights for a period of twelve months following the date of this Prospectus
without the Underwriter's prior written consent, the possibility that a
substantial number of the Company's securities may be sold in the public market
may adversely affect prevailing market prices for the Common Stock and could
impair the Company's ability to raise capital through the sale of its equity
securities. See "Description of Securities" and "Shares Eligible for Future
Sale."
 
   
    SIGNIFICANT OUTSTANDING OPTIONS AND WARRANTS; POTENTIAL ADVERSE EFFECT ON
MARKET PRICE OF COMMON STOCK. Upon the consummation of this offering, there will
be outstanding options and warrants to purchase an aggregate of 1,656,102 shares
of Common Stock (including 170,000 shares of Common Stock issuable upon exercise
of the Underwriter's Warrants) at exercise prices ranging from $1.61 to $9.66
per share. To the extent that outstanding options and warrants are exercised,
dilution to the percentage ownership of the Company's stockholders will occur
and any sales in the public market of the Common Stock underlying such options
and warrants may adversely affect prevailing market prices for the Common Stock.
Moreover, the terms upon which the Company will be able to obtain additional
equity capital may be adversely effected since the holders of outstanding
options and warrants can be expected to exercise them at a time when the Company
would, in all likelihood, be able to obtain any needed capital on terms more
favorable to the Company than those provided in the outstanding options and
warrants. See "Management--Stock Option Plan," "Description of
Securities--Warrants and Options" and "Underwriting."
    
 
    NO ASSURANCE OF PUBLIC MARKET; ARBITRARY DETERMINATION OF OFFERING PRICE;
POSSIBLE VOLATILITY OF MARKET PRICE OF COMMON STOCK. Prior to this offering,
there has been no public trading market for the Common Stock. There can be no
assurance that a regular trading market for the Common Stock will develop after
this offering or that, if developed, it will be sustained. The initial public
offering price of the Common Stock has been determined arbitrarily by
negotiation between the Company and the Underwriter and is not necessarily
related to the assets, book value or potential earnings of the Company or any
other recognized criteria of value and may not be indicative of the prices that
may prevail in the public market. In addition, the market price for the Common
Stock following this offering may be highly volatile as has been the case with
the securities of other companies in emerging businesses. Factors such as the
Company's operating results, announcements of the Company or its competitors,
introduction of new products or technologies by the Company or its competitors
and various factors affecting the network security industry generally or the
market for firewall products in particular may have a significant impact on the
market price of the Common Stock. Additionally, in recent years, the stock
market has experienced a high level of price and volume volatility and market
prices for the stock of many companies, particularly of small and emerging
growth companies, the common stock of which trade in the over-the-counter
market, have experienced wide price fluctuations which have not necessarily been
related to the operating performance of such companies. See "Underwriting."
 
    POSSIBLE DELISTING OF SECURITIES FROM NASDAQ SYSTEM; RISKS RELATING TO
LOW-PRICED STOCKS. It is currently anticipated that the Common Stock will be
eligible for listing on Nasdaq upon the completion of this offering. In order to
continue to be listed on Nasdaq, however, the Company must maintain $2,000,000
in net tangible assets (total assets, other than goodwill, less total
liabilities), and a $1,000,000 market value of the public float. In addition,
continued inclusion requires two market-makers, a minimum bid price of $1.00 per
share and adherence to certain corporate governance provisions. The failure to
meet these maintenance criteria in the future may result in the delisting of the
Common Stock from Nasdaq, and trading, if any, in the Common Stock would
thereafter be conducted in the non-Nasdaq over-the-counter
 
                                       16
<PAGE>
market. As a result of such delisting, an investor could find it more difficult
to dispose of or to obtain accurate quotations as to the market value of the
Common Stock.
 
    In addition, if the Common Stock were to become delisted from trading on
Nasdaq and the trading price of the Common Stock were to fall below $5.00 per
share, trading in the Common Stock would also be subject to the requirements of
certain rules promulgated under the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), which require additional disclosure by broker-dealers in
connection with any trades involving a stock defined as a penny stock
(generally, any non-Nasdaq equity security that has a market price of less than
$5.00 per share, subject to certain exceptions). Such rules require the
delivery, prior to any penny stock transaction, of a disclosure schedule
explaining the penny stock market and the risks associated therewith and impose
various sales practice requirements on broker-dealers who sell penny stocks to
persons other than established customers and accredited investors (generally
defined as an investor with a net worth in excess of $1,000,000 or annual income
exceeding $200,000 individually or $300,000 together with a spouse). For these
types of transactions, the broker-dealer must make a special suitability
determination for the purchaser and have received the purchaser's written
consent to the transaction prior to the sale. The broker-dealer also must
disclose the commissions payable to the broker-dealer, current bid and offer
quotations for the penny stock and, if the broker-dealer is the sole market-
maker, the broker-dealer must disclose this fact and the broker-dealer's
presumed control over the market. Such information must be provided to the
customer orally or in writing before or with the written confirmation of trade
sent to the customer. Monthly statements must be sent disclosing recent price
information for the penny stock held in the account and information on the
limited market in penny stocks. The additional burdens imposed upon
broker-dealers by such requirements could, in the event the Common Stock were
deemed to be a penny stock, discourage broker-dealers from effecting
transactions in the Common Stock which could severely limit the market liquidity
of the Common Stock and the ability of purchasers in this offering to sell the
Common Stock in the secondary market.
 
   
    ADVERSE EFFECT OF PREFERRED STOCK; ANTI-TAKEOVER PROVISIONS AFFECTING
STOCKHOLDERS. The Company's Certificate of Incorporation authorizes the
Company's Board of Directors to issue 5,000,000 shares of "blank check"
Preferred Stock and to fix the rights, preferences, privileges and restrictions,
including voting rights, of these shares, without further stockholder approval.
Upon consummation of this offering, there will be 562,836 shares of Series C
Preferred Stock outstanding. The holders of the Series C Preferred Stock will be
entitled to a liquidation preference of $5.25 per share plus any declared but
unpaid dividends before any payments are made to holders of Common Stock, in the
event of liquidation, dissolution or winding up of the Company or, if elected by
a majority of the outstanding shares of Series C Preferred Stock, upon the sale
of all or substantially all of the assets of the Company or the merger of the
Company into any other entity. The rights of the holders of Common Stock will be
subject to and may be adversely affected by the rights of holders of the Series
C Preferred Stock or additional Preferred Stock that may be designated and
issued in the future. The ability to issue additional series of Preferred Stock
without stockholder approval could have the effect of making it more difficult
for a third party to acquire a majority of the voting stock of the Company
thereby delaying, deferring or preventing a change in control of the Company.
Moreover, following the consummation of this offering, the Company will be
subject to the State of Delaware's "business combination" statute, which
prohibits a publicly-traded Delaware corporation from engaging in various
business combination transactions with any of its 15% stockholders for a period
of three years after the date of the transaction in which the person became an
"interested stockholder," unless certain approvals are obtained or other events
occur. The statute could prohibit or delay mergers or other attempted takeovers
or changes in control with respect to the Company and, accordingly, may
discourage attempts to acquire the Company. See "Description of Securities."
    
 
    TAX LOSS CARRYFORWARD. The Company's net operating loss carryforwards
("NOLs") expire in the years 2009 to 2012. Under Section 382 of the Internal
Revenue Code of 1986, as amended, utilization of prior NOLs is limited after an
ownership change, as defined in Section 382, to an annual amount equal to the
value of the corporation's outstanding stock immediately before the date of the
ownership change
 
                                       17
<PAGE>
   
multiplied by the long-term tax exempt rate. The additional equity financing
obtained by the Company in connection with recent financings and this offering
will result in an ownership change and, thus, will limit the Company's use of
its prior NOLs. In the event the Company achieves profitable operations, any
significant limitation on the utilization of its NOLs would have the effect of
increasing the Company's tax liability and reducing net income and available
cash reserves. The Company is unable to determine the availability of such NOLs
since this availability is dependent upon profitable operations, which the
Company has not achieved in prior periods. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and Note H to Notes
to Financial Statements.
    
 
   
    LIMITATIONS ON LIABILITY OF DIRECTORS AND OFFICERS. The Company's
Certificate of Incorporation includes provisions to eliminate, to the full
extent permitted by Delaware General Corporation Law as in effect from time to
time, the personal liability of directors of the Company for monetary damages
arising from a breach of their fiduciary duties as directors. The Certificate of
Incorporation also includes provisions to the effect that the Company shall, to
the maximum extent permitted from time to time under the law of the State of
Delaware, indemnify any director or officer. In addition, the Company's By-laws
require the Company to indemnify, to the fullest extent permitted by law, any
director, officer, employee or agent of the Company for acts which such person
reasonably believes are not in violation of the Company's corporate purposes as
set forth in the Certificate of Incorporation. See "Management--Limitation of
Liability and Indemnification Matters."
    
 
                                       18
<PAGE>
                                USE OF PROCEEDS
 
   
    The net proceeds to the Company from the sale of the 1,700,000 shares of
Common Stock offered hereby, (after deducting underwriting discounts and
commissions and other expenses of the offering) are estimated to be
approximately $8,145,000 ($9,476,100 if the Underwriter's over-allotment option
is exercised in full). The Company expects to use the net proceeds (assuming no
exercise of the Underwriter's over-allotment option) during the twelve months
following this offering approximately as follows:
    
 
   
<TABLE>
<CAPTION>
                                                                             APPROXIMATE    APPROXIMATE PERCENTAGE
APPLICATION OF NET PROCEEDS                                                 DOLLAR AMOUNT       OF NET PROCEEDS
- --------------------------------------------------------------------------  --------------  -----------------------
<S>                                                                         <C>             <C>
Sales and marketing(1)....................................................   $  3,620,000               44.4%
Software development(2)...................................................      1,310,000               16.1
Payment of trade payables(3)..............................................        595,000                7.3
Repayment of outstanding indebtedness(4)..................................        585,000                7.2
Purchase of computer equipment(5).........................................        200,000                2.5
Relocation of offices(6)..................................................        150,000                1.8
Working capital and general corporate purposes(7).........................      1,685,000               20.7
                                                                            --------------             -----
    Total.................................................................   $  8,145,000              100.0%
                                                                            --------------             -----
                                                                            --------------             -----
</TABLE>
    
 
- ------------------------
 
   
(1) Represents (i) approximately $1,870,000 for sales, marketing and promotional
    activities related to the Company's software products and (ii) approximately
    $1,750,000 for the salaries and related costs of up to 20 additional sales
    and marketing personnel. See "Business--Sales and Marketing."
    
 
   
(2) Represents estimated costs associated with software development, including
    the salaries of up to 12 additional software engineers and developers. See
    "Business--Product Development."
    
 
   
(3) Represents payment of (i) estimated past due trade payables and (ii)
    approximately $95,000 of certain liabilities assumed by the Company in
    connection with the CommHome Acquisition. See "Business-- CommHome Systems
    Corporation Acquisition," "Certain Transactions" and Financial Statements.
    
 
   
(4) Represents amounts to repay (i) $575,000 principal amount of promissory
    notes issued from February 1997 through October 1998, plus estimated accrued
    interest thereon at annual rates between 6% and 10%, including $102,811
    which will be paid to Charles P. Stevenson, Jr., a principal stockholder of
    the Company, and affiliated entities, $75,000 which will be paid to
    Applewood Associates, L.P., a principal stockholder of the Company, and
    $56,235 which will be paid to Corey M. Horowitz, Chairman of the Board of
    Directors and a principal stockholder of the Company, and CMH Capital
    Management Corp., of which Mr. Horowitz is the sole stockholder. The Company
    used the net proceeds from the issuance of the promissory notes for working
    capital and general corporate purposes. See "Certain Transactions."
    
 
   
(5) Represents expenditures to purchase hardware and software as well as servers
    and test equipment for the Company's operations.
    
 
(6) Represents costs associated with relocating the Company's principal office
    location to the Boston, Massachusetts area, including rent and related
    costs. See "Business--Facilities."
 
   
(7) Represents amounts which may be used to pay a portion of the compensation
    for executive officers (such aggregate salaries are estimated to be $840,000
    during the twelve months following the consummation of this offering), rent,
    trade payables, consulting fees and professional fees.
    
 
   
    If the Underwriter's over-allotment option is exercised in full, the Company
will realize additional net proceeds of $1,331,100, of which 50% will be
allocated to working capital and general corporate purposes and 50% will be
allocated to repay additional indebtedness. See "Certain Transactions."
    
 
                                       19
<PAGE>
    The allocation of the net proceeds from this offering set forth above
represents the Company's best estimate based upon its currently proposed plans
and assumptions relating to its operations and certain assumptions regarding
general economic conditions. If any of these factors change, the Company may
find it necessary or advisable to reallocate some of the proceeds within the
above-described categories or to use portions thereof for other purposes. The
Company may also use a portion of the net proceeds for the acquisition of
businesses, technologies, or products which it believes are complimentary to
those of the Company, although there are currently no commitments or agreements
with respect to any such acquisitions as of the date of this Prospectus, except
for the acquisition of CommHome. See "Business-- CommHome Systems Corporation
Acquisition."
 
    Based on currently proposed plans and assumptions relating to its
operations, and implementation of its business plan (including the timetable of
costs and expenses associated with, and success of, its marketing efforts) the
Company anticipates that the net proceeds of this offering, together with
projected revenues from operations, will be sufficient to fund the Company's
operations and capital requirements for approximately twelve months following
the consummation of this offering. There can be no assurance, however, that such
funds will not be expended prior thereto due to unanticipated changes in
economic conditions or other unforeseen circumstances. In the event the
Company's plans change or its assumptions change or prove to be inaccurate (due
to unanticipated expenses, difficulties, delays or otherwise) or the net
proceeds of this offering and projected revenues otherwise prove to be
insufficient to fund the implementation of the Company's business plan or
working capital requirements, the Company could be required to seek additional
financing sooner than currently anticipated. The Company has no current
arrangements with respect to any additional financing. Consequently, there can
be no assurance that any additional financing will be available to the Company
when needed, on commercially reasonable terms or at all.
 
    Proceeds not immediately required for the purposes described above will be
invested principally in United States government securities, short-term
certificates of deposit, or other similar short-term, interest bearing
investments.
 
                                       20
<PAGE>
                                    DILUTION
 
   
    The difference between the initial public offering price per share of Common
Stock and the net tangible book value per share of Common Stock after this
offering constitutes the dilution to investors in this offering. Net tangible
book value per share is determined by dividing the net tangible book value of
the Company attributable to Common Stock (total tangible assets less total
liabilities less the amount of equity representing the liquidation preferrence
of any outstanding preferred stock) by the number of outstanding shares of
Common Stock without giving effect to the conversion of any convertible
securities, unless otherwise indicated.
    
 
   
    At June 30, 1998, the negative net tangible book value of the Company
attributable to Common Stock was ($1,428,000) or $(.85) per share ($(.36) per
share, on a pro forma basis after giving effect to (i) the conversion of the
outstanding shares of Series B Convertible Preferred Stock into 310,399 shares
of Common Stock upon consummation of this offering, and (ii) the issuance of
596,741 shares of Common Stock in exchange for the cancellation of outstanding
warrants and options to purchase 789,521 shares of Common Stock on July 8, 1998
(collectively, the "Pro Forma Adjustments")). After also giving effect to the
sale by the Company of the 1,700,000 shares of Common Stock offered hereby
(after deducting underwriting discounts and commissions and estimated expenses
of this offering) and the Offering Adjustments (see footnote 2 of "Prospectus
Summary--Summary Financial Information"), the adjusted net tangible book value
of the Company attributable to Common Stock at June 30, 1998 would have been
$6,733,000, or $1.54 per share, representing an immediate increase in net
tangible book value of $1.90 per share to the existing stockholders and an
immediate dilution of $4.46 (74.3%) per share to new investors. The following
table illustrates the foregoing information with respect to dilution to new
investors on a per share basis:
    
 
   
<TABLE>
<S>                                                             <C>        <C>
Initial public offering price.................................             $    6.00
  Pro forma net tangible book value before offering...........  $    (.36)
  Increase attributable to new investors......................       1.90
                                                                ---------
Adjusted net tangible book value after offering...............                  1.54
                                                                           ---------
Dilution per share to new investors...........................             $    4.46
                                                                           ---------
                                                                           ---------
</TABLE>
    
 
   
    The following table sets forth, with respect to the Company's existing
stockholders (after giving effect to the Pro Forma Adjustments and the Offering
Adjustments and assuming conversion of the Series C Preferred Stock into 562,836
shares of Common Stock) and new investors in this offering, a comparison of the
number of shares of Common Stock acquired from the Company, the percentage
ownership of such shares, the total consideration paid, the percentage of total
consideration paid and the average price per share.
    
 
   
<TABLE>
<CAPTION>
                                                      SHARES PURCHASED         TOTAL CONSIDERATION
                                                   -----------------------  --------------------------       AVERAGE
                                                     NUMBER      PERCENT       AMOUNT        PERCENT     PRICE PER SHARE
                                                   ----------  -----------  -------------  -----------  -----------------
<S>                                                <C>         <C>          <C>            <C>          <C>
Existing Stockholders............................   3,225,467        65.5%  $  10,199,208        50.0%      $    3.16
New Investors....................................   1,700,000        34.5      10,200,000        50.0            6.00
                                                   ----------       -----   -------------       -----
Total............................................   4,925,467       100.0%  $  20,399,208       100.0%
                                                   ----------       -----   -------------       -----
                                                   ----------       -----   -------------       -----
</TABLE>
    
 
   
    The above tables assume no exercise of the Underwriter's over-allotment
option. If such option is exercised in full, the Company will use 50% of the net
proceeds therefrom ($665,550) to repay certain indebtedness and, as a result,
126,771 shares of Series C Preferred Stock will not be issued and existing
stockholders will have paid $9,533,658 for 3,098,696 shares. In addition, the
new investors will have paid $11,730,000 for 1,955,000 shares of Common Stock,
representing approximately 55.2% of the total consideration, for 38.7% of the
total number of shares of Common Stock outstanding. In addition, the above
tables do not give effect to shares issuable upon exercise of outstanding
warrants and options to purchase 1,656,102 shares of Common Stock, including
options to purchase 855,216 shares of Common Stock issued under the Stock Option
Plan and 170,000 shares of Common Stock issuable upon exercise of the
Underwriter's Warrants. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations," "Management--Stock Option Plan,"
Description of Securities--Warrants and Options" and "Underwriting."
    
 
                                       21
<PAGE>
                                DIVIDEND POLICY
 
    The Company has never declared or paid any cash dividends on its Common
Stock and does not intend to declare or pay cash or other dividends in the
foreseeable future. The Board of Directors currently expects to retain any
future earnings for use in the operation and expansion of its business. The
declaration and payment of any future dividends will be at the discretion of the
Board of Directors and will depend upon a variety of factors, including future
earnings, if any, operations, capital requirements, the general financial
condition of the Company, the preferences of any series of Preferred Stock which
may be designated in the future, the general business conditions and future
contractual restrictions on payment of dividends, if any.
 
                                 CAPITALIZATION
 
    The following table sets forth the capitalization of the Company (i) as of
June 30, 1998 and (ii) as adjusted to give effect to the sale of the Common
Stock offered hereby, the anticipated application of the estimated net proceeds
therefrom and the Pro Forma Adjustments (see "Dilution") and the Offering
Adjustments (see footnote 2 of "Prospectus Summary -- Summary Financial
Information"). The information set forth below should be read in conjunction
with the Financial Statements and Notes thereto and "Management's Discussion and
Analysis of Financial Condition and Results of Operations."
 
   
<TABLE>
<CAPTION>
                                                                                             JUNE 30, 1998
                                                                                     -----------------------------
<S>                                                                                  <C>            <C>
                                                                                        ACTUAL       AS ADJUSTED
                                                                                     -------------  --------------
Short-term debt....................................................................  $   2,582,000        --
                                                                                     -------------  --------------
                                                                                     -------------  --------------
Stockholders' equity (deficit)(1):
  Preferred Stock, $.01 par value, 5,000,000 shares authorized.....................
    Series A Preferred Stock, no shares issued or outstanding, actual, and as
      adjusted.....................................................................       --              --
    Series B Convertible Preferred Stock, 500,000 shares issued and outstanding,
      actual; no shares issued and outstanding, as adjusted........................  $       5,000        --
    Series C Convertible Preferred Stock, no shares issued and outstanding, actual;
      562,836 shares issued and outstanding, as adjusted (liquidation preference
      $2,954,888)(2)...............................................................       --        $        6,000
  Common Stock, $.01 par value; 25,000,000 shares authorized; 1,678,104 shares
    issued and outstanding, actual; 4,362,631 shares issued and outstanding, as
    adjusted(3)....................................................................         17,000          43,000
  Additional paid-in capital.......................................................      9,432,000      20,969,000
  Accumulated deficit..............................................................     (9,460,000)    (10,758,000)
  Unearned portion of compensatory stock options...................................       (572,000)       (572,000)
                                                                                     -------------  --------------
    Total stockholders' equity (deficit)...........................................       (578,000)      9,688,000
                                                                                     -------------  --------------
      Total capitalization.........................................................  $    (578,000) $    9,688,000
                                                                                     -------------  --------------
                                                                                     -------------  --------------
</TABLE>
    
 
- ------------------------
 
(1) See Note F to Notes to Financial Statements.
 
   
(2) See Note J [2] to Notes to Financial Statements.
    
 
   
(3) Does not include (i) 855,216 shares of Common Stock issuable upon exercise
    of stock options (of which options to purchase 448,875 shares were granted
    as of June 30, 1998) under the Stock Option Plan, (ii) 630,886 shares of
    Common Stock issuable upon exercise of other outstanding options and
    warrants and (iii) 170,000 shares of Common Stock reserved for issuance upon
    exercise of the Underwriter's Warrants.
    
 
                                       22
<PAGE>
                            SELECTED FINANCIAL DATA
 
    The following selected financial data for the years ended December 31, 1996
and December 31, 1997 and at December 31, 1997 have been derived from the
Company's audited financial statements. The following selected financial data
for the six month periods ended June 30, 1997 and 1998 and at June 30, 1998 have
been derived from unaudited financial statements which have been prepared on the
same basis as the audited financial statements and, in the opinion of
management, contain all adjustments, consisting only of normal recurring
adjustments, necessary to present fairly the information presented. The results
for the six month period ended June 30, 1998 are not necessarily indicative of
the results to be expected for any other interim period or the fiscal year. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and Financial Statements.
 
STATEMENT OF OPERATIONS DATA:
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED DECEMBER 31,      SIX MONTHS ENDED JUNE 30,
                                                             ----------------------------  ----------------------------
<S>                                                          <C>            <C>            <C>            <C>
                                                                 1996           1997           1997           1998
                                                             -------------  -------------  -------------  -------------
Revenues:
  Licenses.................................................  $     624,000  $   1,132,000  $     506,000  $     412,000
  Royalties................................................       --              500,000        500,000       --
  Services.................................................        403,000        737,000        421,000        490,000
                                                             -------------  -------------  -------------  -------------
      Total revenues.......................................      1,027,000      2,369,000      1,427,000        902,000
                                                             -------------  -------------  -------------  -------------
Cost of revenues:
  Amortization of software development costs...............        246,000        321,000        125,000        267,000
  Cost of licenses.........................................        193,000        176,000         52,000        128,000
  Cost of services.........................................        390,000        418,000        212,000        272,000
                                                             -------------  -------------  -------------  -------------
      Total cost of revenues...............................        829,000        915,000        389,000        667,000
                                                             -------------  -------------  -------------  -------------
Gross profit...............................................        198,000      1,454,000      1,038,000        235,000
Operating expenses:
  Product development......................................        892,000        792,000        235,000        283,000
  Selling and marketing....................................      1,614,000        926,000        524,000        351,000
  General and administrative...............................      1,931,000      1,573,000        919,000      1,153,000
                                                             -------------  -------------  -------------  -------------
      Total operating expenses.............................      4,437,000      3,291,000      1,678,000      1,787,000
                                                             -------------  -------------  -------------  -------------
Loss from operations.......................................     (4,239,000)    (1,837,000)      (640,000)    (1,552,000)
Interest expense...........................................       (260,000)      (553,000)      (141,000)      (438,000)
                                                             -------------  -------------  -------------  -------------
Net loss...................................................  $  (4,499,000) $  (2,390,000) $    (781,000) $  (1,990,000)
                                                             -------------  -------------  -------------  -------------
                                                             -------------  -------------  -------------  -------------
Loss per share (1).........................................  $       (2.46) $       (1.29) $        (.40) $       (1.17)
Weighted average number of shares outstanding (1)..........      1,825,163      1,855,244      1,934,334      1,699,120
</TABLE>
 
BALANCE SHEET DATA:
 
   
<TABLE>
<CAPTION>
                                                                       DECEMBER 31, 1997         JUNE 30, 1998
                                                                       -----------------  ----------------------------
                                                                            ACTUAL           ACTUAL      AS ADJUSTED
                                                                       -----------------  ------------  --------------
<S>                                                                    <C>                <C>           <C>
Cash and cash equivalents............................................    $      60,000    $    634,000  $    8,349,000
Working capital (deficit)............................................         (661,000)     (2,429,000)      8,187,000
Total assets.........................................................        2,404,000       3,129,000      10,494,000
Total liabilities....................................................        2,479,000       3,707,000         806,000
Accumulated deficit..................................................       (7,470,000)     (9,460,000)    (10,758,000)
Total stockholders' equity (deficit).................................          (75,000)       (578,000)      9,688,000
</TABLE>
    
 
- ------------------------
 
(1) See Notes A and B to Notes to Financial Statements for an explanation of
    shares used in net loss per share calculations.
 
                                       23
<PAGE>
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
    THE FOLLOWING DISCUSSION AND ANALYSIS SHOULD BE READ IN CONJUNCTION WITH THE
COMPANY'S FINANCIAL STATEMENTS, INCLUDING THE NOTES THERETO, INCLUDED ELSEWHERE
IN THIS PROSPECTUS. EXCEPT FOR THE HISTORICAL INFORMATION CONTAINED HEREIN, THIS
DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE RISKS AND
UNCERTAINTIES, INCLUDING, WITHOUT LIMITATION, THOSE CONCERNING THE COMPANY'S
STRATEGY AND GROWTH PLANS. BECAUSE SUCH STATEMENTS INVOLVE RISKS AND
UNCERTAINTIES, ACTUAL RESULTS MAY DIFFER MATERIALLY FROM THOSE EXPRESSED OR
IMPLIED BY SUCH FORWARD-LOOKING STATEMENTS. FACTORS THAT COULD CAUSE SUCH
DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED UNDER "RISK
FACTORS."
 
GENERAL
 
    The Company develops, markets, licenses and supports a family of network
security software products designed to provide comprehensive security to
computer networks including Internet based systems and internal networks and
computing resources. The Company also offers to its customers a full range of
consulting services in network security, network design and support. From
inception (July 1990) through December 31, 1994, the Company was primarily
engaged in providing consulting and training services. In 1995, the Company
began to shift its focus from consulting and training to the development and
marketing of network security software products. The Company introduced its
first FIREWALL/PLUS software product in June 1995. Accordingly, the Company has
a limited relevant operating history as a software developer upon which an
evaluation of its prospects and future performance can be made. Such prospects
must be considered in light of the risks, expenses and difficulties frequently
encountered in the operation and expansion of a new business and the shift from
research and product development to commercialization of products based on
rapidly changing technologies in a highly specialized and emerging market. The
Company will be required to significantly expand its product and development
capabilities, introduce new products, introduce enhanced features to existing
products, expand its in-house sales force, establish and maintain distribution
channels through third-party vendors, increase marketing expenditures, further
expand its management team and attract additional qualified personnel. In
addition, the Company must adapt to the demands of an emerging and rapidly
changing computer network security market, intense competition and rapidly
changing technology and industry standards. There can be no assurance that the
Company can successfully address such risks, and the failure to do so would have
a material adverse effect on the Company's business, results of operations and
financial condition.
 
    To date, the Company has incurred significant losses and, at June 30, 1998,
had an accumulated deficit of $9,460,000. Inasmuch as the Company intends to
increase its level of activities following the consummation of this offering and
will be required to make significant up-front capital expenditures in connection
with its sales and marketing and continuing research and product development
efforts, the Company anticipates that losses will continue until such time, if
ever, as the Company is able to attain sales levels sufficient to support its
operations. There can be no assurance that the Company will ever achieve
profitable operations. The Company's independent auditors have included an
explanatory paragraph in their report on the Company's financial statements for
the year ended December 31, 1996 and December 31, 1997, stating that certain
factors raise substantial doubt about the Company's ability to continue as a
going concern.
 
   
    The Company has only recently employed certain members of senior management
relating to expansion of its operations and this offering, including Avi A.
Fogel, President and Chief Executive Officer, Robert P. Olsen, Vice President of
Product Management, Murray P. Fish, Chief Financial Officer, Joseph A. Donohue,
Vice President of Engineering and Joseph D. Harris, Vice President of
International Sales. In addition, the Company intends to hire approximately 12
additional software engineers and developers and 20 additional sales and
marketing personnel within twelve months of consummation of this offering, as
well as expand its finance and administrative staff and increase expenses for
employee benefits,
    
 
                                       24
<PAGE>
facilities, consulting, insurance, and other general operating expenses. See
"Business--Sales and Marketing," "Business--Product Development" and
"Management."
 
    The Company's FIREWALL/PLUS family of software products has not yet achieved
market acceptance. The future success of the Company is largely dependent upon
market acceptance of its FIREWALL/PLUS family of software products. While the
Company believes that its FIREWALL/PLUS family of software products offer
advantages over competing products for network security, license revenues and
royalties from FIREWALL/PLUS products since their introduction (June 1995)
through June 30, 1998 has only been $2,561,000, including a non-refundable
pre-paid royalty of $500,000. There can be no assurance that FIREWALL/PLUS will
gain significant market acceptance. Revenue from such commercial products depend
on a number of factors, including the influence of market competition,
technological changes in the network security market, the Company's ability to
design, develop and introduce enhancements on a timely basis, and the ability of
the Company to successfully establish and maintain distribution channels. The
failure of FIREWALL/PLUS to achieve significant market acceptance, as a result
of competition, technological change or other factors, would have a material
adverse effect on the Company's business, operating results and financial
condition.
 
    The Company's revenues are generated primarily from product license fees for
the use of the Company's software products (license revenues) and service fees
for consulting services, including training and maintenance (service revenues).
Revenues from licenses are recognized upon (i) delivery of the software or, if
the customer has evaluation software, delivery of the software key, and (ii)
issuance of the related license, assuming that no significant vendor obligations
or customer acceptance rights exist. In October 1997, the American Institute of
Certified Public Accountants issued Statement of Position ("SOP") No. 97-2,
SOFTWARE REVENUE RECOGNITION, which the Company adopted, effective January 1,
1997. Such adoption had no effect on the Company's methods of recognizing
revenue from its license and maintenance activities. Prior to 1997, the
Company's revenue policy was in accordance with the preceding authoritative
guidance provided by SOP No. 91-1, SOFTWARE REVENUE RECOGNITION.
 
    The Company recognizes service revenue upon delivery of the service or
ratably over the period of service. Consulting fees are recognized as such
services are performed. Annual maintenance, which may be purchased in
conjunction with the licensing of a product, is offered for an annual fee
generally equal to 15% of the then current license fee and is recorded as
service revenue ratably over the contract term.
 
    The Company markets and licenses its products and services primarily through
third parties, such as VARs, systems integrators, resellers, distributors and
OEMs, and to a lesser extent, through the Company's limited in-house sales
force. Licenses through distributors typically have a lower gross margin than
in-house generated licenses since distributors usually receive discounts.
Revenues from third-party distributors accounted for approximately 23% and 72%
of the Company's license revenues for the years ended December 31, 1996 and
1997, respectively, and 60% of the Company's license revenues for the six months
ended June 30, 1998. The Company expects that the percentage of license revenues
generated from third-party distributors to increase in future periods. Pricing
is based upon the number of concurrent connections, the nature of the user's
operating system and whether hardware is needed. Selling and marketing expenses
are expected to increase as a result of proposed expansion of distribution
channels and marketing programs and hiring of additional personnel.
 
    The Company has committed significant product and development resources to
its FIREWALL/PLUS family of products. The Company's anticipated levels of
expenditures for product development are based on its plans for product
enhancements and new product development. The Company capitalizes and amortizes
software development costs in accordance with Statement of Financial Accounting
Standards No. 86. These costs consist of salaries, consulting fees and
applicable overhead. The Company intends to use a portion of the proceeds of
this offering to significantly increase its product development expenditures.
See "Business--Product Development."
 
    The Company's net operating loss carryforwards ("NOLs") expire in the years
2009 to 2012. Under Section 382 of the Internal Revenue Code of 1986, as
amended, utilization of prior NOLs is limited after
 
                                       25
<PAGE>
   
an ownership change, as defined in Section 382, to an annual amount equal to the
value of the corporation's outstanding stock immediately before the date of the
ownership change multiplied by the long-term tax exempt rate. The additional
equity financing obtained by the Company in connection with recent financings
and this offering will result in an ownership change and, thus, will limit the
Company's use of its prior NOLs. In the event the Company achieves profitable
operations, any significant limitation on the utilization of its NOLs would have
the effect of increasing the Company's tax liability and reducing net income and
available cash reserves. The Company is unable to determine the availability of
such NOL's since this availability is dependent upon profitable operations,
which the Company has not achieved in prior periods. See Note H to Notes to
Financial Statements.
    
 
RESULTS OF OPERATIONS
    SIX MONTHS ENDED JUNE 30, 1998 COMPARED TO SIX MONTHS ENDED JUNE 30, 1997
    Revenues decreased by $525,000 or 37%, from $1,427,000 for the six months
ended June 30, 1997 to $902,000 for the six months ended June 30, 1998,
primarily as a result of the Company's receipt of a non-refundable pre-paid
royalty of $500,000 during the six months ended June 30, 1997.
    License revenues decreased by $94,000 or 19%, from $506,000 for the six
months ended June 30, 1997 to $412,000 for the six months ended June 30, 1998,
primarily due to a lack of financial resources for marketing of the Company's
software products during the six months ended June 30, 1998 and certain initial
product licensing payments received from international resellers during the six
months ended June 30, 1997. During the six months ended June 30, 1998, revenues
from FIREWALL/PLUS products and third party virtual private network ("VPN")
products accounted for $326,000 and $86,000 of license revenues, respectively,
and during the six months ended June 30, 1997, license revenues consisted solely
of licenses of FIREWALL/PLUS products. Royalties were $500,000 for the six
months ended June 30, 1997 as a result of the receipt of a non-refundable
pre-paid royalty of $500,000 from Trusted Information Systems, Inc. ("TIS") in
June 1997 and $0 for the six months ended June 30, 1998.
    Service revenues increased by $69,000 or 16%, from $421,000 for the six
months ended June 30, 1997 to $490,000 for the six months ended June 30, 1998.
Service revenues from consulting increased by $71,000 or 20%, from $353,000 for
the six months ended June 30, 1997 to $424,000 for the six months ended June 30,
1998. The increase in service revenues from consulting was attributable to a
large consulting project serviced during the six months ended June 30, 1998.
 
    The Company's three largest customers, The City of Hope, Electronic Data
Systems Corporation ("EDS") and The Sabre Group, Inc. accounted for 32%, 17% and
11% of the Company's revenues, respectively, during the six months ended June
30, 1998. The Company's revenues from customers in the United States represented
83% of its revenues during the six months ended June 30, 1997 and 98% of its
revenues during the six months ended June 30, 1998.
 
    Cost of revenues consists of cost of licenses, amortization of software
development costs and cost of services. Cost of licenses consist of software
media (disks), documentation, product packaging, production costs, product
royalties and the cost of hardware associated with sales of FIREWALL/PLUS
PREMIER VERSION. Cost of licenses increased by $76,000 or 146%, from $52,000 for
the six months ended June 30, 1997 to $128,000 for the six months ended June 30,
1998, representing 10% and 31% of license revenues, respectively. The increase
in cost of licenses in dollar amount and as a percentage of license revenues
resulted primarily from increased hardware costs associated with sales of
FIREWALL/PLUS PREMIER VERSION, which includes computer hardware and, therefore,
has a lower gross margin, and sales of third party VPN products. Cost of
licenses as a percentage of license revenues may fluctuate from period to period
due to changes in product mix, changes in the number or size of transactions
recorded in a given period or an increase or decrease in licenses of products
which would require the Company to pay royalties to third parties. Amortization
of software development costs increased by $142,000 or 114%, from $125,000 for
the six months ended June 30, 1997 to $267,000 for the six months ended June 30,
1998, representing 25% and
 
                                       26
<PAGE>
65% of license revenues, respectively. The increase in the amortization of
software development costs for the six months ended June 30, 1998 was due to the
commencement of amortization of costs of the FIREWALL/ PLUS WINDOWS NT Version
4.0 upon its release in September 1997.
 
    Cost of services consist of salaries, benefits and overhead associated with
consulting services and maintenance. Cost of services increased by $60,000 or
28%, from $212,000 for the six months ended June 30, 1997 to $272,000 for the
six months ended June 30, 1998, representing 50% and 56% of service revenues,
respectively, due to increases in employees and outside consultants.
 
    Gross profit decreased from $1,038,000 for the six months ended June 30,
1997 to $235,000 for the six months ended June 30, 1998, representing 73% and
26% of revenues, respectively. The decrease in gross profit was due to the
receipt of the non-refundable prepaid royalty of $500,000 in June 1997,
decreased license revenues and the increase in cost of sales as a result of
increased amortization of software costs, licenses of third party VPN products
and hardware costs associated with licenses of FIREWALL/PLUS PREMIER VERSION.
    Product development consists of salaries, benefits, travel and related costs
of the Company's product development personnel, including consulting fees, the
costs of computer equipment used in product and technology development and
third-party development contracts. Product development expense increased $48,000
or 20%, from $235,000 for the six months ended June 30, 1997 to $283,000 for the
six months ended June 30, 1998, representing 16% and 31% of revenues,
respectively. Total product development costs, including capitalized costs of
$567,000 and $50,000, were $802,000 and $333,000 for the six months ended June
30, 1997 and June 30, 1998, respectively. The decrease in total product
development costs was due to the significant costs incurred during the six
months ended June 30, 1997 for the development of FIREWALL/PLUS Version 4.0
which was released in September 1997, and reduced expenditures during the six
months ended June 30, 1998 resulting from the Company's lack of financial
resources. The Company currently anticipates that product development costs will
increase as the Company hires additional software engineers and developers to
support the Company's growth. See "Business--Product Development."
    Sales and marketing expenses consist primarily of salaries, including
commissions, benefits, bonuses and travel, advertising, public relations,
consultants and trade shows. Selling and marketing expenses decreased by
$173,000 or 33%, from $524,000 for the six months ended June 30, 1997 to
$351,000 for the six months ended June 30, 1998, representing 37% and 39% of
revenues, respectively. The decrease in selling and marketing expenses was due
primarily to a decrease in marketing efforts during such period resulting from
the Company's lack of financial resources for such purposes.
    General and administrative expenses include employee costs, including
salary, benefits, travel and other related expenses associated with management,
finance and accounting operations, and legal and other professional services
provided to the Company. General and administrative expenses increased by
$234,000 or 25%, from $919,000 for the six months ended June 30, 1997 to
$1,153,000 for the six months ended June 30, 1998, representing 64% and 128% of
revenue, respectively. The increase in general and administrative expenses was
due primarily to non-cash charges of $583,000 during the six months ended June
30, 1998 related to the value of stock options issued to the Company's Chief
Executive Officer and other securities issued to an affiliate of the Company's
Chairman of the Board of Directors and third parties for services, as compared
to non-cash charges of $95,000 during the six months ended June 30, 1997 related
to consulting services. This increase was partially offset by reduced
professional fees, recruitment fees and travel and entertainment expenses during
the six months ended June 30, 1998. The Company currently anticipates that
general and administrative expenses will increase significantly as the Company
hires additional personnel to support its growth in future periods.
    Interest expense increased by $297,000 or 211%, from $141,000 for the six
months ended June 30, 1997 to $438,000 for the six months ended June 30, 1998,
representing 10% and 49% of revenues, respectively. The increase in interest
expense was due primarily to an increase in the amortization of debt
 
                                       27
<PAGE>
   
discount for the six months ended June 30, 1998 related to private financings
consisting of notes and warrants. Interest expense is expected to be
significantly reduced following consummation of this offering since (i)
indebtedness of $2,954,888 will be cancelled in exchange for 562,836 shares of
Series C Preferred Stock and (ii) approximately $585,000 of the proceeds of this
offering will be used to repay the balance of the Company's outstanding debt.
See "Certain Transactions."
    
    No provision for or benefit from federal, state or foreign income taxes was
recorded for the six months ended June 30, 1997 or the six months ended June 30,
1998 because the Company incurred net operating losses during each period and
fully reserved its deferred tax assets as their future realization could not be
determined.
    As a result of the foregoing, the net loss increased by $1,209,000 or 155%,
from $781,000 for the six months ended June 30, 1997 to $1,990,000 for the six
months ended June 30, 1998.
    YEAR ENDED DECEMBER 31, 1997 COMPARED TO YEAR ENDED DECEMBER 31, 1996
    Revenues increased by $1,342,000 or 131%, from $1,027,000 for the year ended
December 31, 1996 ("1996") to $2,369,000 for the year ended December 31, 1997
("1997"). License revenues increased by $508,000 or 81%, from $624,000 for 1996
to $1,132,000 for 1997, as a result of introduction of FIREWALL/PLUS for Windows
NT. Royalties were $500,000 in 1997 and $0 in 1996 as a result of receipt of a
non-refundable pre-paid royalty of $500,000 from TIS relating to licensing
certain of the Company's technology in June 1997. Service revenues increased by
$334,000 or 83%, from $403,000 for 1996 to $737,000 for 1997. Service revenues
from consulting increased by $245,000 or 68% from $359,000 in 1996 to $604,000
in 1997, primarily as a result of servicing a large consulting project during
1997. Service revenues from maintenance increased by $89,000 or 202% from
$44,000 in 1996 to $133,000 in 1997, as a result of an increase in the customer
base for FIREWALL/PLUS products which purchased maintenance contracts. The
Company's three largest customers, TIS, EDS and ARCO accounted for 21%, 15% and
13% of the Company's revenues, respectively, in 1997. The Company's revenues
from customers in the United States represented 93% of its revenues in 1996 and
84% of its revenues in 1997.
    Cost of licenses decreased $17,000 or 9%, from $193,000 for 1996 to $176,000
for 1997, representing 31% and 16% of license revenues, respectively. The
decrease in the cost of licenses resulted primarily from the hardware costs
associated with decreased licenses of both FIREWALL/PLUS PREMIER VERSION and
third party products. The decrease in cost of licenses as a percentage of
license revenues was due to the change in product mix as license revenue from
FIREWALL/PLUS PREMIER VERSION, which includes hardware, accounted for a lower
percentage of license revenues in 1997. Amortization of software development
costs increased by $75,000 or 30%, from $246,000 for 1996 to $321,000 for 1997,
representing 39% and 28% of license revenues, respectively. The increase in
amortization of software development costs was due to the commencement of
amortization of costs of Windows NT Version 3.0 of FIREWALL/PLUS upon its
release in December 1996 and Version 4.0 upon its release in September 1997.
 
    Cost of services increased by $28,000 or 7%, from $390,000 for 1996 to
$418,000 for 1997, representing 97% and 57% of service revenues, respectively.
The decrease in cost of services as a percentage of service revenues was due
primarily to the increase in service revenues which did not require increased
personnel.
    Gross profit increased from $198,000 for 1996 to $1,454,000 for 1997,
representing 19% and 61% of revenues, respectively. The increase in gross profit
was due to increased license revenue of $508,000, and the receipt of a $500,000
prepaid royalty in June 1997 and a $334,000 increase in service revenue.
    Product development expenses decreased by $100,000 or 11%, from $892,000 for
1996 to $792,000 for 1997, representing 87% and 33% of revenues, respectively.
The decrease in product development costs was due primarily to an increased
portion of time spent by developers on the development of Windows NT Versions
3.0 and 4.0 of FIREWALL/PLUS and the capitalization of such costs. During 1996
and 1997, the
 
                                       28
<PAGE>
Company capitalized $750,000 and $850,000, respectively, of additional software
development costs associated with the development and enhancement of its
FIREWALL/PLUS family of products.
    Sales and marketing expenses decreased by $688,000 or 43%, from $1,614,000
for 1996 to $926,000 for 1997, representing 157% and 39% of revenues,
respectively. The decrease in sales and marketing expenses in dollar amount was
due primarily to a decrease in advertising expenses and the reduction of trade
shows and related travel in the aggregate amount of $633,000 due to the
Company's lack of funds for sales and marketing. The decrease in sales and
marketing expenses as a percentage of sales was due to the aforementioned
factors, as well as the Company's significant increase in revenues.
    General and administrative expenses decreased by $358,000 or 19%, from
$1,931,000 for 1996 to $1,573,000 for 1997, representing 188% and 66% of
revenues for 1996 and 1997, respectively. The decrease in general and
administrative expenses in dollar amount and as a percentage of revenues in 1997
was due primarily to a charge of $518,000 related to the issuance of warrants to
advisory board members in 1996 and reduced professional fees, recruiting fees,
office supplies and stationary, repairs and maintenance contracts, travel and
bad debt expenses, partially offset by higher salaries and depreciation.
    Interest expense increased by $293,000 or 113%, from $260,000 for 1996 to
$553,000 for 1997, representing 25% and 23% of revenue for 1996 and 1997,
respectively. The increase in interest expense was due primarily to increased
amortization of debt discount as a result of the issuance of $1,500,000
principal amount promissory notes and warrants to purchase 210,628 shares of
Common Stock during 1997. Debt discount is amortized over the life of the debt
instrument.
    No provision for or benefit from federal, state or foreign income taxes was
recorded for 1996 or 1997 because the Company incurred net operating losses for
each year and fully reserved its deferred tax assets as their future realization
could not be determined.
    As a result of the foregoing, the net loss decreased by $2,109,000 or 47%,
from $4,499,000 for 1996 to $2,390,000 for 1997.
LIQUIDITY AND CAPITAL RESOURCES
    The Company's capital requirements have been and will continue to be
significant, and its cash requirements have been exceeding its cash flow from
operations. At June 30, 1998, the Company had $634,000 of cash and cash
equivalents and a working capital deficit of $2,429,000. The Company has
financed its operations primarily through private sales of equity and debt
securities. Net cash used in operating activities was $708,000 and $848,000
during 1997 and the six months ended June 30, 1998, respectively. Net cash used
in operating activities for 1997 was primarily attributable to a net loss of
$2,390,000 and an increase in accounts receivable of $309,000 which was
partially offset by increases in accounts payable, accrued expenses and other
current liabilities of $744,000, and amortization of debt discount of $500,000
and depreciation and amortization of $481,000. Net cash used in operating
activities for the six months ended June 30, 1998 was primarily attributable to
a net loss of $1,990,000 and an increase in accounts receivable of $192,000,
partially offset by amortization of debt discount of $364,000, issuance of
Common Stock and warrants for services rendered of $583,000 and depreciation and
amortization of $346,000.
   
    The Company's operating activities during 1996, 1997 and the six months
ended June 30, 1998 were financed primarily with $3,948,000 of net proceeds from
the sale of Common Stock with respect to a private placement completed in March
1996, $1,500,000 of net proceeds from the issuance of $1,500,000 principal
amount of notes and warrants to purchase 210,628 shares of Common Stock in 1997
and $1,750,000 of net proceeds from the issuance of $1,750,000 principal amount
of notes and warrants to purchase 325,919 shares of Common Stock during the six
months ended June 30, 1998. Upon consummation of this offering, the entire
principal amount of $3,250,000 and interest accrued on such outstanding notes
will be cancelled in exchange for the issuance of Series C Preferred Stock or
repaid with
    
 
                                       29
<PAGE>
   
proceeds from this offering. The Company will incur aggregate non-cash charges
estimated to be $668,000 relating to the amortization of debt discount with
respect to $3,250,000 principal amount promissory notes which will be repaid or
cancelled in exchange for shares of Series C Preferred Stock. The Company does
not currently have a line of credit from a commercial bank or other institution.
    
 
   
    Simultaneously with the consummation of this offering, the Company, through
its wholly-owned subsidiary, will acquire CommHome in exchange for 46,667 shares
of the Company's Common Stock valued at $280,000 plus the assumption of
approximately $200,000 of liabilities, of which $105,000 will be satisfied with
the issuance of 17,500 shares of the Company's Common Stock. Upon consummation
of the acquisition, the Company will incur a charge for purchased research and
development of $469,000 representing the excess of the purchase price plus the
assumed liabilities over the fair value of the tangible assets acquired of
$1,000. See "Business--CommHome Systems Corporation Acquisition."
    
    The Company is dependent on the proceeds of this offering to implement its
business plan and finance its working capital requirement. The Company
anticipates, based on currently proposed plans and assumptions relating to the
implementation of its business plan (including the timetable of, costs and
expenses associated with, and success of, its marketing efforts), that the net
proceeds of this offering, together with projected revenues from operations,
will be sufficient to satisfy the Company's operations and capital requirements
for approximately twelve months following the consummation of this offering.
There can be no assurance, however, that such funds will not be expended prior
thereto due to unanticipated changes in economic conditions or other unforeseen
circumstances. In the event the Company's plans change or its assumptions change
or prove to be inaccurate (due to unanticipated expenses, difficulties, delays
or otherwise) or the net proceeds of this offering and projected revenues
otherwise prove to be insufficient to fund the implementation of the Company's
business plan or working capital requirements, the Company could be required to
seek additional financing sooner than currently anticipated. The Company has no
current arrangements with respect to any additional financing. Consequently,
there can be no assurance that any additional financing will be available to the
Company when needed, on commercially reasonable terms or at all. Any inability
to obtain additional financing when needed would have a material adverse effect
on the Company, requiring it to curtail and possibly cease its operations. In
addition, any additional equity financing may involve substantial dilution to
the interests of the Company's then existing stockholders.
FLUCTUATIONS IN OPERATING RESULTS
    The Company anticipates significant quarterly fluctuations in its operating
results in the future. The Company generally ships orders for commercial
products as they are received and, as a result, does not have any material
backlog. As a result, quarterly revenues and operating results depend on the
volume and timing of orders received during the quarter, which are difficult to
forecast. Operating results may fluctuate on a quarterly basis due to factors
such as the demand for the Company's products, purchasing patterns and budgeting
cycles of customers, the introduction of new products and product enhancements
by the Company or its competitors, market acceptance of new products introduced
by the Company or its competitors and the size, timing, cancellation or delay of
customer orders, including cancellation or delay in anticipation of new product
introduction or enhancement. In addition, the Company's consulting revenues tend
to fluctuate as projects, which may continue over several quarters, are
undertaken or completed. Therefore, comparisons of quarterly operating results
may not be meaningful and should not be relied upon, nor will they necessarily
reflect the Company's future performance. Because of the foregoing factors, it
is likely that in some future quarters the Company's operating results will be
below the expectations of public market analysts and investors. In such event,
the price of the Common Stock would likely be materially adversely affected.
    Licensing of the Company's products generally involves a significant
commitment of capital by customers, with the attendant delays frequently
associated with large capital expenditures for complex technology. Accordingly,
the sales cycle for the Company's products can be lengthy and generally
 
                                       30
<PAGE>
commences at the time a prospective customer demonstrates an interest in
licensing a FIREWALL/PLUS solution, typically includes a 30-day free evaluation
period and ends upon execution of a purchase order by the customer. The length
of the sales cycle varies depending on the type and sophistication of the
customer and the complexity of the operating system and may extend for periods
of six to nine months. As a result of the Company's lengthy sales cycle, license
of the Company's products generally require the Company to make expenditures and
use significant resources prior to receipt, if any, of corresponding revenues.
YEAR 2000 ISSUE
   
    The Company has assessed the potential software issues associated with the
Year 2000 and believes its software products are Year 2000 compliant and,
therefore, does not expect to incur material costs related thereto. With regard
to internal computing resources utilized in its operations, the Company does not
expect to incur material costs to make such resources Year 2000 compliant.
    
 
                                       31
<PAGE>
                                    BUSINESS
 
OVERVIEW
 
    The Company develops, markets, licenses and supports a family of network
security software products designed to provide comprehensive security to
computer networks, including Internet based systems and internal networks and
computing resources. The Company's FIREWALL/PLUS family of security software
products enables an organization to protect its computer networks from internal
and external attacks and to secure organizational communications over such
internal networks and the Internet. The Company also offers its customers a full
range of consulting services in network security and network design and support
in order to build, maintain and enhance customer relationships and increase the
demand for its software products.
 
    The FIREWALL/PLUS family of security solutions is designed to protect
against Internet and intranet (internal networks utilizing Internet technology
and applications based upon TCP/IP--the Internet network transport protocol)
based security threats and to address security needs that arise from within
internal networks that often utilize other network transport protocols besides
TCP/IP including, among others, Novell's IPX, Digital Equipment's DECnet and
IBM's SNA. The Company's FIREWALL/PLUS family of firewall products operates on
the Microsoft Windows NT operating system platform. FIREWALL/PLUS' proprietary
Interceptor Shim and filter engine software technology, with its unique ability
to handle and filter all commonly used network transport protocols, provide
organizations with a highly secure and flexible security solution. Additionally,
unlike most other firewall solutions which focus on an enterprise's connection
to the Internet, the FIREWALL/PLUS solution can be deployed throughout the
enterprise; at the perimeter to control access to and from the Internet, between
internal networks and on application servers and desktop PCs to protect data
residing on such servers and PCs. The Company's FIREWALL/PLUS for Windows NT
received the 1997 Internet and Electronic Commerce Conference award for "Best
Intranet Solution" and the 1997 ENT Magazine Readers Choice Award for "Best NT
Firewall."
 
INDUSTRY BACKGROUND
 
   
    A critical resource of every organization is its information and its ability
to distribute and access information throughout the enterprise. Computing has
moved from large centralized mainframes to distributed client/server
architecture consisting of interconnected personal computers dispersed
throughout an organization. Organizations utilize local area networks ("LANs")
to share information and applications internally. Many organizations have
connected LANs, including geographically dispersed networks, into wide area
networks ("WANs"). In addition, the explosive growth in telecommuting has
resulted in LANs and WANs frequently being accessed from remote locations via
traditional modem dial-up, Integrated Services Digital Network ("ISDN") and
recently introduced cable modems and Asymmetric Digital Subscriber Line ("ADSL")
modems. There is a growing use of establishing these remote connections to an
organization's central resources, via Internet links, rather than through
dedicated point-to-point connections.
    
 
    This evolution from mainframe computers supporting a number of terminals,
towards networks of interconnected personal computers has resulted in a wide
range of technologies from a multitude of vendors being used within internal
networks in order to satisfy different enterprise computing requirements. As a
result, heterogeneous networks utilizing a variety of network transport
protocols are commonplace within LANs and WANs. Although TCP/IP has become a
widely accepted network transport protocol due to the growth of the Internet and
the popularity of TCP/IP applications for use within internal networks, network
transport protocols such as IPX, DECnet, AppleTalk and SNA, among others, are
still utilized throughout networked environments, and the Company believes such
network transport protocols will continue to be utilized due to the large
investments in installed systems and applications using these protocols.
Further, computing environments often run one or more incompatible versions of
the same protocol suite for extended periods of time while converting to new
versions or to support older
 
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<PAGE>
applications or systems which cannot use the newer versions of a given protocol
suite. In addition, Windows NT is shipped from Microsoft with four complete
network transport protocols (IP, IPX, AppleTalk and NetBEUI) for use with NT
when connected to a corporate network.
 
    The Windows NT server market continues to grow and outpace sales of other
popular non-NT-based servers. According to recent studies by International Data
Corporation and Dataquest, in 1997, servers shipped with the Windows NT
operating system exceeded shipments of servers utilizing other operating
systems.
 
    NETWORK SECURITY
 
    Although open computing environments have many business advantages, their
accessibility makes an organization's critical software applications and
electronically stored data vulnerable to security threats. Open computing
environments are inherently complex, typically involving a variety of hardware,
operating systems, network transport protocols and applications supplied by a
multitude of vendors, making these networks difficult to manage, monitor and
protect from unauthorized access or attack. The security risk associated with
network computing is complicated by the increasing popularity of the Internet,
intranets and extranets (intranets which allow access to one or more users
outside of the internal network). By connecting an internal private network to
the Internet, unauthorized third parties are given a new means by which to
access an organization's private network. The combination of TCP/IP with other
commonly used network transport protocols within internal networks, increases
the network security challenge because of the various avenues of attack
available to both internal and external attackers.
 
    As a result of the explosive growth in network computing and Internet use
(as well as use of intranets and extranets), protection of an organization's
network and data has become a significant economic concern for businesses.
According to the 1997 Annual Information Week/Ernst & Young LLP Information
Security Survey of information technology managers and professionals, 42% of the
respondents reported malicious acts from external sources, as compared to 16% in
the prior year, and 43% of the respondents reported malicious acts by employees
as compared to 29% in the prior year. According to FBI estimates, U.S. companies
suffer estimated losses of $5 to $10 billion per year as a result of
unauthorized access to information and data. According to the 1998 CSI/FBI
Computer Crime and Security Survey, 44% of the respondents reported unauthorized
access by employees. The Company believes that securely segmenting internal
network areas and computing resources from unauthorized access will become
paramount to insuring the integrity of both the internal network and an
organization's intranet and extranet resources.
 
    FIREWALLS
 
    A firewall is a security solution that enables an organization to protect
its computer resources from unauthorized access by internal and external users.
Firewalls enforce security access control policies between a trusted network and
an untrusted network. Only authorized traffic as defined by security policies is
allowed access through the firewall. Firewalls are predominantly utilized today
to provide security for a network's perimeter by preventing external breaches of
the internal network (trusted network) from untrusted external sources (the
public network).
 
    Due to the significant growth in Internet connections, a number of companies
have introduced firewall products ("IP Firewalls") designed primarily to protect
an internal network using TCP/IP as the network transport protocol from Internet
based security threats or threats from within intranets. IP Firewalls can also
filter other network transport protocols used specifically with the IP routing
protocol (such as UDP and ICMP). In addition, a limited number of IP Firewalls
have limited filtering capabilities for a small number of non-IP based network
transport protocols.
 
    Firewalls can also serve to provide access control between individual
sub-networks on an internal network or to control access between an internal
network and a selected outside party authorized to have access to the internal
network for limited purposes. IP Firewalls can accomplish this task to the
extent that
 
                                       33
<PAGE>
TCP/IP is the network transport protocol being used within an internal network
as is the case with intranets and extranets. To the extent other network
transport protocols are utilized within such an internal network, IP Firewalls
will disallow all data utilizing any such network transport protocol from
passing through the firewall, thereby denying access entirely to a party which
is intended to have such access. This reduces the effectiveness of IP Firewalls
in a multi-protocol networked environment.
 
    The Company's FIREWALL/PLUS family of security solutions is designed to
address security needs that arise from within internal networks utilizing
non-TCP/IP network transport protocols, including Novell's IPX, Digital
Equipment Corporation's DECnet and IBM's SNA, as well as to protect against
TCP/IP based Internet and intranet security threats addressed by IP Firewalls.
The Company's FIREWALL/PLUS suite of products consists of a firewall designed to
control access to an organization's internal network from the public networks
(the "ENTERPRISE VERSION"), a firewall controlling access between the network
and a trusted application server (the "SERVER VERSION") and a firewall
controlling access between the network and a trusted client workstation (the
"CLIENT VERSION").
 
    The IP Firewall market is expected to continue to experience dramatic
growth. International Data Corporation estimates that 1996 unit shipments of
firewalls grew by more than 250%, compared with 1995, with 1996 revenues of
approximately $220 million. Unit sales of firewalls are expected to increase
from 36,610 units or approximately $220 million in 1996 to 1.1 million units or
$730 million in 2001. It is anticipated that unit prices of firewalls will
experience a decline in the future because of increased competition. The Company
believes that these projections do not take into account the need for firewalls
to protect computing environments that do not rely exclusively on TCP/IP as the
network transport protocol. While an organization generally requires a small
number of firewalls to restrict vulnerability to TCP/IP based threats from the
Internet, it may require numerous firewalls to protect internal networks from
attacks from within the organization.
 
    The Company believes that securely segmenting internal network areas and
computing resources from unauthorized access will become paramount to insuring
the integrity of both the internal network and an organization's intranet and
extranet resources. The Company further believes that multiple network transport
protocols will remain prevalent in computing environments because of the large
installed base of non-IP based computer systems and applications. The
FIREWALL/PLUS security solution is positioned to address the security issues
faced by enterprises with multi-protocol networking environments seeking to
prevent unauthorized access and attacks from the Internet, intranets and
extranets and internal networks using network transport protocols other than
TCP/IP.
 
NETWORK-1 STRATEGY
 
    The Company intends to pursue an aggressive growth strategy and to focus its
efforts on marketing its FIREWALL/PLUS family of network security products. Key
elements of the Company's strategy are:
 
    - PROVIDE COMPREHENSIVE NETWORK SECURITY SOLUTIONS. The Company's strategy
      is to develop, market and support a family of network security products to
      address a broad range of security issues confronting computer networks and
      computing, including concerns arising from allowing access to the Internet
      as well as concerns relating to the security of internal networks. The
      Company's comprehensive approach to network security is based on its
      FIREWALL/PLUS technology, which offers robust security for data
      communications utilizing TCP/IP as well as other network transport
      protocols. The FIREWALL/PLUS family of firewall products currently
      includes the FIREWALL/PLUS ENTERPRISE VERSION, FIREWALL/PLUS SERVER
      VERSION and the FIREWALL/PLUS CLIENT VERSION.
 
    - EMPHASIS ON INTERNAL NETWORK SECURITY. While FIREWALL/PLUS has the ability
      to protect an organization's computer network from Internet, intranet and
      extranet based security threats, the Company believes that its ability to
      filter multiple network transport protocols offers significant advantages
      as a security product for internal networks where multiple network
      transport protocols are common. Accordingly, the Company will seek to
      exploit this advantage by focusing significant marketing
 
                                       34
<PAGE>
      resources on the internal network security market. The Company intends to
      devote a significant portion of the proceeds of this offering for sales
      and marketing toward educating potential end users and third-party
      distributors as to the need to protect networks and computing resources
      from unauthorized access and attacks from within an internal network and
      the capabilities and benefits of the Company's products.
 
    - ESTABLISH AND MAINTAIN SUCCESSFUL THIRD PARTY DISTRIBUTION
      RELATIONSHIPS. The Company's marketing plan includes a multi-channel
      distribution strategy which emphasizes establishing and maintaining
      third-party distributor relationships with systems integrators, VARs, OEMs
      and resellers in the United States and internationally. The Company
      intends to increase its internal sales and support organization following
      the consummation of this offering primarily to provide additional support
      to its third-party distributors.
 
    - LEVERAGE CONSULTING CLIENTS. The Company has designed, planned, audited
      and implemented numerous networks worldwide for a broad spectrum of
      clients, including Fortune 500 companies, small companies with modest
      requirements, federal, state and foreign governments and utilities, as
      well as education and research institutions. The Company believes that its
      consulting clients provide a base of potential customers for its software
      products. In addition, the Company's consulting relationships may
      facilitate its development and enhancement of software products as the
      Company's consultants receive feedback and guidance directly from network
      administrators and other technical personnel regarding products and
      features needed in the marketplace. See "Business-- Consulting."
 
FIREWALL/PLUS TECHNOLOGY
 
    The Company's network security solutions are based upon its proprietary
FIREWALL/PLUS technology which provides organizations with enterprise wide
security to protect against unauthorized access from the Internet as well as
security for internal sources of intrusion and breach. The following are key
aspects of the Company's FIREWALL/PLUS solution:
 
    ENTERPRISE-WIDE DEPLOYMENT. Unlike most other firewall solutions which focus
on an enterprise's connection to the Internet, the FIREWALL/PLUS solution, as a
result of its unique architecture, may be used throughout the enterprise; at the
perimeter to control access to and from the Internet, between internal networks
and on application servers, including web servers, and desktop PCs to protect
data residing on such servers and PCs. While competing firewall solutions must
be installed on dedicated computers, FIREWALL/PLUS can operate on a Windows NT
desktop computer or application server without interfering with the normal
operation of such desktop computer or server. As a result, the FIREWALL/PLUS
security solution can be installed on existing strategic computing resources
within the enterprise without incurring the expense of additional computing
hardware.
 
    MULTI-LAYER SECURITY. The architecture of Windows NT includes two operating
modes, the "user" and "kernel" modes. The FIREWALL/PLUS solution is implemented
in kernel mode to maximize performance and to provide maximum security from
network intrusion to the operating system environment. Using proprietary
kernel-level software code developed by the Company, FIREWALL/PLUS' Interceptor
Shim and security filter engine technology introduce a security layer between
the network hardware drivers and the Windows NT operating system. FIREWALL/PLUS
filters all network traffic before it reaches Windows NT. Incoming data packets
enter the network through the network interface card and its associated hardware
driver and are immediately passed to the Interceptor Shim, which directs them to
the FIREWALL/PLUS filter engine. The filter engine, using a proprietary
high-speed, real-time security policy enforcement language, checks the packet
and associated packet history against the security rule policy database to
determine whether the packet should be allowed to enter the system. The Company
believes that FIREWALL/PLUS' multi-layer approach to security strengthens
Windows NT by providing a layer of security that filters packets before entering
the Windows NT operating system.
 
                                       35
<PAGE>
    ADVANCED FILTERING SYSTEM. The Company's FIREWALL/PLUS family of products
includes an advanced filtering system which currently utilizes stateful
inspection and application layer filtering technology to provide security for
TCP/IP related network transport protocols and applications. Stateful filtering
involves the knowledge of states of protocols at specific transaction intervals
during the network connection between two communicating applications between
specific systems. Transaction states occur at routing, transport, session
control and application layers when two programs interoperate with each other
over a computer network connection. When these states are defined to
FIREWALL/PLUS, FIREWALL/PLUS can take actions on conditions that violate the
required or expected stateful actions of one or a simultaneous series of
protocols. Most firewalls have been based upon architectures incorporating
either packet filtering or proxy filtering. FIREWALL/PLUS adopts a hybrid
approach which incorporates frame, packet, application layer, proxy and stateful
inspection capabilities in the security management of network connections. The
Company believes that this hybrid approach allows the Company to offer a
firewall product that maximizes security without sacrificing performance.
 
    MULTI-PROTOCOL CAPABILITY. A unique aspect of FIREWALL/PLUS is its ability
to provide multi-protocol filtering not available from network security products
offered by other firewall vendors. FIREWALL/PLUS has the advantage of filtering
not only TCP/IP, but also a multitude of other network transport protocols. The
Company believes that the ability of FIREWALL/PLUS to filter multiple network
transport protocols offers significant advantages as a security product for
internal networks where multiple network transport protocols are common.
FIREWALL/PLUS is capable of utilizing stateful inspection technology for
numerous network transport protocols once the various "states" of such protocols
are defined to FIREWALL/PLUS. The states of TCP/IP and several other of the more
commonly used protocols are capable of being defined. For those protocols not
capable of being defined, FIREWALL/PLUS performs frame, packet and application
filtering. In a Windows NT based environment, it is typical for all commonly
used multiple network transport protocols to co-exist, as Windows NT comes
pre-equipped with TCP/IP, IPX (Novell), NetBEUI (LAN Manager) and AppleTalk. In
addition, certain applications require the use of non-TCP/IP protocols to
operate between sub-networks on a network. FIREWALL/PLUS' multi-protocol
filtering capability is effective in supporting web servers on the Internet,
intranets and extranets and other information provision systems that access
information stored on mainframe computers via non-IP protocols. While some
commercially available routers allow basic packet filtering for multiple network
transport protocols, the Company believes its multi-protocol advanced filtering
capabilities offer superior features to routing solutions such as a graphical
user interface, extensive logging, reporting and alarming and security policy
time management.
 
    TRANSPARENCY. FIREWALL/PLUS may be operated in a transparent mode. In this
mode, FIREWALL/PLUS has no network address (i.e. it is not visible on the
network) and therefore can not be identified for attack. The Company believes
that this feature provides additional security to the operating system because
when a firewall has a network address, it can be located and is more susceptible
to attack. FIREWALL/PLUS provides firewall protection while operating in
transparent mode, except that certain features such as remote management, proxy
support and virtual private networking are not functional.
 
    CENTRALIZED MANAGEMENT. FIREWALL/PLUS allows for centralized management and
monitoring that allows a network manager to manage and monitor a system from a
local or remote location. Accordingly, large and geographically dispersed
firewalls may be managed from a single location.
 
    CUSTOMIZED SECURITY POLICIES. FIREWALL/PLUS also allows customized security
policies for individual departments, applications and individual systems and
personnel within the network. Network managers may apply security rules to any
version of the FIREWALL/PLUS products so that individual systems, protocols,
applications, frames and many other network entities are either explicitly
denied or authorized access to specific applications and other network entities.
 
    MULTI-PROTOCOL ENCRYPTION TUNNELS. Once firewalls are in place at multiple
sites on a WAN or the Internet, the ability to establish encrypted
communications links over these connections becomes possible,
 
                                       36
<PAGE>
thereby reducing reliance on more costly dedicated telecommunications
alternatives. FIREWALL/PLUS provides for integrated data encryption to protect
communications over the Internet and other public networks from unauthorized
access. Encryption tunnels, known as virtual private networks ("VPNs"), may be
set up for any Windows NT based protocol to protect communications between
different locations of an organization's internal network or between different
locations and selected customers, suppliers or strategic partners. FIREWALL/PLUS
extends this ability such that VPNs may be formed between locations across the
Internet irrespective of the transport protocol being tunneled. The Company
currently resells VPN client solutions from Aventail Corporation in conjunction
with FIREWALL/PLUS.
 
    PROXY SUPPORT. Proxy based firewalls filter network traffic by running a
separate software program that acts as a proxy for each application to be
allowed through the firewall. These firewall solutions require the customer to
purchase the proxies supplied by the vendor for the applications supported by
the vendor's architectural model. As a result, the customer may not find all the
required application proxies from a specific firewall vendor for all the
application suites being used or may find that the proxies offered by the
firewall vendor are not sufficient to support all the required security needs.
 
    FIREWALL/PLUS includes several popular proxies in addition to frame, packet,
application layer, proxy and stateful inspection capabilities. These proxies
implement popular features for specific application types such as HTTP and FTP.
The Company currently licenses HTTP and FTP proxies from Network Associates,
Inc. FIREWALL/PLUS also allows the use of other third-party proxies in
conjunction with or in lieu of proxies offered by the Company. FIREWALL/PLUS'
architecture allows the Company to partner and include external or third-party
proxies quickly and easily to suit a variety of security requirements.
Additionally, custom-written proxies for a client-server architecture at a
customer site may easily be added to the FIREWALL/PLUS system by adjusting
security policy rule sets in the firewall database.
 
    EASE OF USE. FIREWALL/PLUS was designed to be easily installed, configured
and managed by a network manager with minimal or no security skills.
FIREWALL/PLUS may be installed and configured by use of the graphical user
interface ("GUI") by simply pointing and clicking the mouse. To facilitate
implementation, FIREWALL/PLUS comes pre-programmed with a wide variety of
frequently used default security policies which require the customer to simply
select one of the rule-bases and save the selection. FIREWALL/PLUS does not
utilize significant server resources and may therefore co-exist on the same
server with other software applications on Windows NT. Unlike many other
competitive firewall products offered today, FIREWALL/PLUS need not run on a
separate dedicated server.
 
PRODUCTS
 
    The Company's family of FIREWALL/PLUS products offers a broad range of
network security solutions. The FIREWALL/PLUS family of products includes the
FIREWALL/PLUS ENTERPRISE VERSION, FIREWALL/PLUS SERVER VERSION and FIREWALL/PLUS
CLIENT VERSION. The Company is currently shipping FIREWALL/PLUS VERSION 4.03.
The Company first introduced the FIREWALL/PLUS ENTERPRISE VERSION for Windows NT
in January 1997. As of August 31, 1998, the Company had licensed one or more of
its FIREWALL/PLUS family of software products to over 180 customers. Revenue
from FIREWALL/PLUS products accounted for 43%, 60% and 35% of the Company's
revenues for the years ended December 31, 1996, 1997 and the six months ended
June 30, 1998, respectively. Following the consummation of this offering, the
Company expects that sales of its FIREWALL/ PLUS products will account for an
increasing percentage of revenues, reflecting the Company's intent to emphasize
the development and marketing of its software products.
 
    FIREWALL/PLUS ENTERPRISE VERSION. The FIREWALL/PLUS ENTERPRISE VERSION
secures an organization's internal network against unwarranted intrusions from
the Internet and is also used between major internal network components as well
as between general access internal networks and special purpose networks such as
process control, real-time and other sensitive access networks. The
FIREWALL/PLUS ENTERPRISE VERSION includes extensive centralized and remote
security management facilities, predefined security policy rules, multi-protocol
VPN capabilities, authentication and encryption facilities, real time connection
management and
 
                                       37
<PAGE>
proxy services. The FIREWALL/PLUS ENTERPRISE VERSION supports Intel processors
and Digital Equipment Corporation Alpha processors that support Windows NT. The
FIREWALL/PLUS ENTERPRISE VERSION is available in scaleable models to support
varying numbers of simultaneous connections for small to mid-size companies and
in an unlimited session version, as well as a high-speed version. Additionally,
the FIREWALL/ PLUS ENTERPRISE VERSION is also available in a PREMIER VERSION
which includes the software installed on a high speed Alpha server running
Windows NT. Based on the number of concurrent connections, the nature of the
user's operating system and whether hardware is needed, the FIREWALL/PLUS
ENTERPRISE VERSION is currently priced to end users between $3,750 and $20,000
for software only versions and from $27,500 to $30,000 for PREMIER VERSIONS,
which include hardware and onsite technical support.
 
    FIREWALL/PLUS SERVER VERSION. The FIREWALL/PLUS SERVER VERSION is designed
to improve internal security of a LAN or intranet or to protect highly sensitive
systems such as key escrow facilities, web servers, digital certificate servers,
database servers and authentication servers. As a server firewall, this solution
provides protection against unauthorized access to network resources by internal
users, where security breaches often originate. The FIREWALL/PLUS SERVER VERSION
co-exists on the server being protected and resides between the network users
and the protected data. FIREWALL/PLUS SERVER VERSION treats all information on
the server as secure and guarded, while treating network connections to the
server as unsecure. FIREWALL/PLUS can be configured using the FIREWALL/PLUS GUI
to allow access to certain users, to specific applications, during designated
times and under a variety of conditions. The FIREWALL/PLUS SERVER VERSION
incorporates all of the major features contained in the FIREWALL/PLUS ENTERPRISE
VERSION. Any other applications including web, file and print services, may be
run simultaneously on the server with the FIREWALL/PLUS SERVER VERSION installed
and operating. The FIREWALL/PLUS CLIENT VERSION is currently priced to end users
at $1,995.
 
    FIREWALL/PLUS CLIENT VERSION. The FIREWALL/PLUS CLIENT VERSION is a full
featured firewall which has been specifically tailored to protect data residing
on Windows NT workstations without disrupting current system operations. These
workstations can run applications while the firewall maintains a high level of
security. When a network attack is detected, it is immediately defeated prior to
the attack being able to access the NT Workstation. The FIREWALL/PLUS CLIENT
VERSION is designed to protect sensitive individual desktop computers (such as a
network control station, a corporate executive's personal computer or the human
resources personnel system) or telecommuter systems where high speed remote
access lines are used (such as cable modems, ADSL and ISDN). The FIREWALL/PLUS
CLIENT VERSION is currently priced to end users at $995.
 
CUSTOMERS
 
   
    The Company's customers represent a wide range of industries, both
commercial and government, which consider networked-data resources to be among
the most important assets within their organizations. As of August 31, 1998, the
Company had licensed one or more of its FIREWALL/PLUS family of products to over
180 customers. Customers for FIREWALL/PLUS products include The Sabre Group
Inc., Electronic Data Systems Corporation ("EDS"), TRW, Inc., United
Technologies, Inc., National Semiconductor Corp., Fairchild Semiconductor,
Atlantic Richfield Company and related entities ("ARCO"), GTE, Inc., and
Continental Airlines. During the year ended December 31, 1997, license revenues
and royalties from TIS and EDS accounted for approximately 21% and 13% of the
Company's revenues, respectively. During the six months ended June 30, 1998,
license revenues from EDS and The Sabre Group, Inc. accounted for 10% and 9% of
the Company's revenues, respectively.
    
 
    Examples of the varied uses of the Company's products by customers include:
 
    - An industry leading system integrator uses ENTERPRISE VERSIONS of
      FIREWALL/PLUS to secure access and communications to and from its
      facilities management personnel and their customers to manage the networks
      of one of the largest telecommunications companies. The FIREWALL/PLUS
      ENTERPRISE VERSIONS are used as perimeter defenses on the company's
      internal backbone, which supports more than 900 outside clients.
 
                                       38
<PAGE>
    - A leading travel service company utilizes multiple FIREWALL/PLUS
      ENTERPRISE and SERVER VERSIONS internally to securely filter non-TCP/IP
      network transport protocols between various segments of the internal
      network. In addition, the company functions as a service company and
      systems integrator dealing with many of the industry's largest travel
      related companies and has installed multiple FIREWALL/PLUS ENTERPRISE
      VERSIONS to interconnect to customer sites.
 
    - A worldwide petrochemical company currently uses FIREWALL/PLUS ENTERPRISE
      VERSION to secure data at multiple sites from internal and external
      breaches. Disparate network transport protocols, including TCP/IP and
      Novell's IPX, are securely and routinely sent from multiple data centers
      (each using FIREWALL/PLUS) throughout the country to a center of
      operations while FIREWALL/PLUS insures the integrity of the data.
 
    The Company believes that the FIREWALL/PLUS security solution is a scaleable
product which satisfies customers' needs to secure the perimeter and internal
resources within their organizations. The Company further believes that
currently available IP Firewalls are not as flexible with respect to both
internal and external security as the FIREWALL/PLUS solution.
 
    During the years ended December 31, 1996 and 1997 and the six months ended
June 30, 1998, license revenue from international customers (licenses to foreign
end users and international distributors) accounted for 7%, 16% and 2% of the
Company's revenues, respectively. All of the Company's revenues from
international licenses were denominated in U.S. dollars. The Company anticipates
that revenues from international customers will account for an increasing
percentage of the Company's revenues in the future.
 
SALES AND MARKETING
 
    The Company is in the process of implementing a sales and marketing plan
which consists of a multi-channel distribution strategy and a promotion strategy
to create consumer awareness of the Company and its FIREWALL/PLUS products and
to educate the market about the need to implement network security products and
of the capabilities and benefits of the Company's FIREWALL/PLUS products.
 
    MULTI-CHANNEL DISTRIBUTION
 
   
    IN-HOUSE SALES FORCE. The Company's internal sales force consists of five
persons, consisting of a Vice President of International Sales, a Vice President
of Business Development, two sales representatives and a sales engineer. The
Company's sales representatives are responsible for soliciting potential
customers and providing technical support to customers, as well as supporting
third-party distribution channels. To date, the Company's internal sales force
has not undertaken significant marketing efforts relating to product
commercialization.
    
 
   
    Following the consummation of this offering, the Company intends to retain a
Vice-President of Sales to oversee the Company's domestic sales and marketing
efforts and approximately 9 additional sales representatives in connection with
the expansion of the Company's marketing efforts. Although the Company's
in-house sales force will continue to solicit potential customers, its primary
responsibility is expected to be supporting third-party distribution channels.
    
 
    THIRD-PARTY DISTRIBUTION CHANNELS. A key element of the Company's
distribution strategy is to establish and maintain relationships with
third-party distributors within the United States and internationally. By
engaging such third-party distributors, the Company is able to utilize the
end-user sales and support infrastructure of these channels.
 
    The Company currently has relationships with 22 national, regional and local
systems integrators, VARs and resellers in the United States, including EDS,
Wang Laboratories, Inc. and BDM International, Inc. In November 1997, the
Company entered into a Master Software License Agreement with EDS pursuant to
which EDS has the non-exclusive right on a worldwide basis to use, market and
distribute the
 
                                       39
<PAGE>
Company's FIREWALL/PLUS family of products including the right to promote and
resell such products in conjunction with providing systems integration,
outsourcing or facilities management services to its customers. The Company also
currently has relationships with international system integrators, VARs,
resellers and distributors in 25 countries, including Japan, Germany, Canada,
United Kingdom, Republic of China, Hong Kong, Russia, Taiwan, Korea, Singapore,
Malaysia, Indonesia, Thailand and Turkey.
 
    The Company's agreements with distributors generally grant the distributor
the right to market the Company's products in specified territories on a
non-exclusive basis, are terminable on short notice and do not prohibit the
distributor from selling products that are competitive with the Company's
products.
 
    The Company intends to continue to seek to establish relationships with
additional third-party distributors, principally larger system integrators and
VARs with the necessary resources to successfully distribute the Company's
FIREWALL/PLUS products. For the year ended December 31, 1997, TIS, EDS and ARCO
accounted for 21%, 15%, and 13%, respectively, of the Company's revenues and for
the six months ended June 30, 1998, The City of Hope, EDS and The Sabre Group,
Inc. accounted for 32%, 17% and 11%, respectively, of the Company's revenues.
The Company's five largest distributors accounted for an aggregate of
approximately 28% and 25% of the Company's revenues for the year ended December
31, 1997 and the six months ended June 30, 1998, respectively.
 
   
    The Company also seeks to enter into OEM or licensing arrangements whereby
the Company grants to an OEM or other third party the right to incorporate
and/or bundle a specific technology of the Company with the OEM's or other
third-party's products. In June 1997, the Company entered into a license
agreement with TIS, which was subsequently acquired by Network Associates, Inc.,
pursuant to which the Company licensed to TIS on a non-exclusive basis the right
to incorporate and/or bundle the Company's Interceptor Shim software with TIS'
family of Gauntlet-TM- firewall products. The Company received a $500,000
non-refundable pre-paid royalty in June 1997. As a result of such pre-paid
royalty, royalties from TIS accounted for 21% of the Company's revenues for the
year ended December 31, l997. In October 1998, Network Associates, Inc. (which
acquired TIS) terminated the license agreement effective December 31, 1998. The
Company expects that its arrangements with third-party distributors and OEMs
will account for an increased percentage of its revenues in the future.
    
 
    ADVERTISING AND PROMOTION
 
    Following the consummation of this offering, the Company intends to
implement an advertising and promotion strategy to create consumer awareness of
the Company and its FIREWALL/PLUS products and to educate the market about
network security threats and FIREWALL/PLUS' ability to address customers' needs.
To date, the Company has engaged in limited advertising and promotion of its
products through its website, trade publications and published product reviews.
The Company intends to use a portion of the proceeds of this offering to
advertise and promote its products through print advertising, Internet website
advertising, direct marketing efforts and participation in trade shows and
seminars which target organization security and management information system
administrators and network system integrators.
 
    The Company's website, www.network-1.com, includes a description of the
Company's FIREWALL/PLUS family of products and enables visitors to the site to
download a 50-session FIREWALL/PLUS ENTERPRISE VERSION for a 30-day trial. The
Company intends to use a portion of the proceeds of this offering to add content
to the website, such as product information, including a user guide, network
security industry information and additional content specific to distributors
and end users; improve download capabilities for the trial version; and enable
purchases via the website.
 
CONSULTING
 
    The Company has designed, planned, audited and implemented numerous networks
worldwide for a broad spectrum of clients, including Fortune 500 companies,
small companies with modest requirements, federal, state and foreign governments
and utilities, as well as education and research institutions.
 
                                       40
<PAGE>
Mr. William Hancock, the Company's Chief Technology Officer and a director, is
an industry expert who has authored networking and security books and has been a
featured columnist as well as a network and security editor for a number of
industry journals. The Company intends to expand its consulting activities
following the consummation of this offering by utilizing the expertise of Mr.
Hancock to create opportunities for consulting through speaking engagements at
industry conferences, seminars and trade shows.
 
    Historically, the Company has offered a wide range of consulting services
designed to provide solutions to networking and security problems. Such
consulting services have included network surveys, network designs and traffic
modeling, security penetration studies, security breach investigation, network
and computer forensics services, hacker prosecutions (in connection with federal
and local law enforcement agencies) and network security technical audits among
other services. The Company generally provides its consulting clients with a
comprehensive report containing detailed findings and recommendations. The
Company offers its consulting services on a per hour or per project basis.
 
    The Company's consulting clients have included, among others, EDS, MCI
Communications Corp., Kraft General Foods, Inc., Alcoa Aluminum Company of
America, TIA-CREF, Southwestern Bell Telephone Co., Chemical Bank Corp., Hewlett
Packard Co., American Airlines, Inc., Bechtel Corporation, ARCO, United
Technologies Sikorsky Aircraft, Bowne, Inc., and the U.S. Government, including
The Environmental Protection Agency.
 
    Consulting services generated 35%, 25% and 47% of the Company's revenues for
the years ended 1996 and 1997 and the six months ended June 30, 1998,
respectively. Consulting revenues from ARCO accounted for 9% of the Company's
revenues for the year ended December 31, 1997 and consulting revenues from The
City of Hope accounted for 28% of the Company's revenues for the six months
ended June 30, 1998. Following the consummation of this offering, the Company
expects that consulting services will account for a decreasing percentage of
revenues as the Company continues to focus its efforts on developing and
marketing its network security software products.
 
CUSTOMER SERVICE AND SUPPORT
 
   
    The Company believes that customer service and support is critical to
retaining customers and attracting prospective customers. The Company provides
customer service and support through its internal technical support staff of 5
persons located at its Grand Prairie, Texas office. Customers receive a 90-day
warranty, which includes technical assistance and product updates. To date, the
Company has not incurred any material warranty expense. Following the expiration
of the 90-day warranty, customers can elect to purchase the Company's annual
maintenance program at an average annual cost of 15% of the then current
purchase price. The maintenance program includes technical assistance and
support, product updates and general information relating to product
introductions and changes. Technical support is available 24 hours a day, 7 days
a week, by telephone and electronic mail. In addition, the Company provides
customers with fee-based on-site installation, support and training. The Company
provides its resellers with sales and technical support.
    
 
PRODUCT DEVELOPMENT
 
    The Company believes that development of new products and enhancements to
existing products are essential for the Company to effectively compete in the
network security market. The Company's product development efforts are directed
toward enhancing its FIREWALL/PLUS family of security products, developing new
products and responding to emerging industry standards and other technological
changes. The Company intends to expand its existing product offerings and to
introduce new application products for the network security market. The
Company's new product development efforts are focused on enhancements to the
Company's current suite of products and new network security products, including
products that support Windows 95/98 operating systems. While the Company expects
that certain of its new products will be developed internally, the Company may,
based on timing and cost considerations, expand
 
                                       41
<PAGE>
its product offerings through acquisitions. In addition, the Company has relied
and will continue to rely on external development resources for the development
of certain of its products and components.
 
    The Company currently has six employees devoted to research and product
development. However, historically, a substantial portion of the Company's
research and development activities have been undertaken by engaging third-party
consultants and independent contractors. During the years ended December 31,
1996 and 1997 and six months ended June 30, 1998, the Company's total product
development costs, including capitalized costs, were $1,642,000, $1,642,000 and
$333,000, respectively.
 
   
    The Company intends to hire and retain approximately 12 additional software
engineers and developers on a full-time basis within twelve months following the
consummation of this offering and has allocated approximately $1,310,000 of the
net proceeds of this offering to software development.
    
 
    The network security industry is characterized by rapid technological
change, changes in customer requirements, frequent new product introductions and
enhancements, new and continuously evolving network security threats and attack
methodologies and evolving industry standards in computer hardware and software
technology. As a result, the Company must continually change and improve its
products in response to such advances and changes in operating systems,
application software, computer and communications hardware, networking software,
programming tools and computer language technology. The introduction of products
embodying new technologies and the emergence of new industry standards may
render existing products obsolete or unmarketable.
 
    The Company's future operating results will depend upon the Company's
ability to enhance its current products and to develop and introduce new
products on a timely basis that address the increasingly sophisticated needs of
the marketplace and that keep pace with technological developments, new
competitive product offerings and emerging industry standards. There can be no
assurance that the Company will be successful in developing and marketing new
products or product enhancements that respond to technological change and
evolving industry standards and customer requirements, that the Company will not
experience difficulties that could delay or prevent the successful development,
introduction and marketing of these products, or that any new products and
product enhancements will adequately meet the requirements of the marketplace
and achieve market acceptance. In the event that the Company does not respond
adequately to the need to develop and introduce new products or enhancements of
existing products in a timely manner in response to changing market conditions
or customer requirements, the Company's business, operating results and
financial condition will be materially adversely affected.
 
COMPETITION
 
   
    The network security market in general, and the firewall product market in
particular, is characterized by intense competition and rapidly changing
business conditions, customer requirements and technologies. The Company
believes that the principal competitive factors affecting the market for network
security products include security effectiveness, name recognition, scope of
product offerings, product features, distribution channels, price, ease of use
and customer service and support. Currently, the Company's principal competitors
include AXENT Technologies Inc., Bay Networks, Inc. (a subsidiary of Northern
Telecom Limited), CheckPoint Software Technologies, Ltd., Cisco Systems, Inc.,
Compaq Computer Corporation, Cyberguard Corp., International Business Machines
Corporation, ISS Group, Inc., Microsoft Corporation, Network Associates, Inc.
and Secure Computing Corporation. Due to the rapid expansion of the network
security market, the Company may face competition from new entrants.
    
 
    Most of the Company's current and potential competitors have longer
operating histories, greater name recognition, larger installed customer bases
and possess substantially greater financial, technical and marketing and other
competitive resources than the Company. As a result, the Company's competitors
may be able to adapt more quickly to new or emerging technologies and changes in
customer requirements or devote greater resources to the promotion and sale of
their products than the Company. While the Company believes that its firewall
products do not compete against manufacturers of other types of
 
                                       42
<PAGE>
security products (such as encryption and authentication products), there can be
no assurance that potential customers will not perceive the products of such
other companies as substitutes for the Company's products. In addition, certain
of the Company's competitors may determine for strategic reasons to consolidate,
to substantially lower the price of their network security products or to bundle
their products with other products, such as hardware or other enterprise
software products. Accordingly, it is possible that new competitors and
alliances among competitors may emerge and rapidly acquire significant market
share. There can be no assurance that the Company's current and potential
competitors will not develop products that may be more effective than the
Company's current or future products or that the Company's products would not be
rendered obsolete or less marketable by evolving technologies or changing
consumer demands or that the Company will otherwise be able to compete
successfully. Increased competition for firewall products may result in price
reductions, reduced gross margins and adversely effect the Company's ability to
gain market share, any of which would adversely affect the Company's business,
operating results and financial condition.
 
PROPRIETARY RIGHTS
 
    The Company's success is substantially dependent on its proprietary
technologies. The Company does not hold any patents and relies on copyright and
trade secret laws, non-disclosure agreements with employees, distributors and
customers, including "shrink wrap" license agreements that are not signed by the
customer, and technical measures to protect the ideas, concepts and
documentation of its proprietary technologies and know-how to protect its
intellectual property rights. Such methods may not afford complete protection,
and there can be no assurance that third parties will not independently develop
substantially equivalent or superior technologies or obtain access to the
Company's technologies, ideas, concepts and documentation. In addition, there
can be no assurance that any confidentiality agreements between the Company and
its employees, distributors or customers will provide meaningful protection for
the Company's proprietary information in the event of any unauthorized use or
disclosure. Any inability to protect its proprietary technologies could have a
material adverse effect on the Company. Furthermore, the Company may be subject
to additional risk as it enters into transactions in countries where
intellectual property laws are not well developed or are poorly enforced. Legal
protection of the Company's rights may be ineffective in such countries.
 
    The Company also licenses from a third party certain proxy technology which
is incorporated into its FIREWALL/PLUS products. The Company is dependent in
part on its ability to continue to license such technology. Any inability of the
Company to be able to continue to utilize such technology either as a result of
the Company's breach or the termination of a license agreement or otherwise, in
the absence of similar available technologies, could have a material adverse
effect on the Company.
 
    The Company received a U.S. trademark registration for the FIREWALL/PLUS
name in December 1996. Although the Company is not aware of any challenges to
the Company's rights to use this trademark, there can be no assurance that the
use of this mark would be upheld if challenged.
 
    Although the Company believes that its technologies and products have been
developed independently and do not infringe upon the proprietary rights of
others, there can be no assurance that the Company's technologies and products
do not and will not so infringe or that third parties will not assert
infringement claims against the Company in the future. The Company is not aware
of any patent infringement charge or any violation of other proprietary rights
claimed by any third party relating to the Company or the Company's products. In
response to certain public statements made by CheckPoint Software Technologies,
Ltd. related to a patented technology referred to as "stateful inspection" (the
"Checkpoint Patent"), the Company retained patent counsel in April 1997 to
review the Checkpoint Patent as compared to the Company's intellectual property
and associated products. Based upon the opinion of the Company's intellectual
property counsel, the Company does not believe that the CheckPoint Patent will
have a material adverse effect on the Company. If, however, the Company's
technologies or products were deemed to infringe upon the Checkpoint Patent, or
if the Company's technologies or
 
                                       43
<PAGE>
products were deemed to infringe upon the proprietary rights of other third
parties, the Company could become liable for damages or be required to modify
its products or to obtain a license.
 
    As the number of security products being offered continue to increase the
functionality of such products may further overlap, which could result in
increased infringement claims by software developers, including infringement
claims against the Company with respect to future products. There can be no
assurance that the Company would be able to modify its products or obtain a
license in a timely manner, upon acceptable terms and conditions, or at all, or
that the Company will have the financial or other resources necessary to defend
a patent infringement or other proprietary rights infringement action. Failure
to do any of the foregoing could have a material adverse effect on the Company,
including possibly requiring the Company to cease marketing its products.
 
COMMHOME SYSTEMS CORPORATION ACQUISITION
 
   
    On September 11, 1998, the Company entered into a merger agreement with
CommHome, effective upon consummation of this offering, pursuant to which the
CommHome stockholders have agreed to exchange all of the outstanding common
stock of CommHome for 46,667 shares of Common Stock of the Company valued at
$280,000. Pursuant to the merger agreement, the Company has agreed to assume
approximately $200,000 of liabilities of CommHome, which include $55,000 and
$50,000 owed to Avi A. Fogel and Robert P. Olsen, respectively. Messrs. Fogel
and Olsen have agreed to accept 9,167 and 8,333 shares of Common Stock,
respectively, in full satisfaction of such indebtedness. Mr. Fogel, President,
Chief Executive Officer and a director of the Company, is also President, Chief
Executive Officer and a director of CommHome and owns 51% of the outstanding
shares of CommHome. Mr. Olsen, Vice President of Product Management of the
Company, is the former Vice President of Marketing of CommHome. See "Certain
Transactions."
    
 
    CommHome, incorporated in June, 1997, is a development stage company that
has not achieved revenues from operations. At June 30, 1998, CommHome had a
stockholders' deficiency of $188,831 and an accumulated deficit of $188,861.
Upon consummation of the CommHome Acquisition, the Company will incur a charge
for purchased research and development of $469,000, representing the excess of
the purchase price plus the assumed liabilities over the fair value of the
tangible assets acquired of $1,000.
 
    CommHome is engaged in the design and development of residential networking
solutions for high speed Internet access to the home. CommHome's designs are
intended to provide easy access to the Internet throughout the home. These
solutions include secure connections to high speed networking technologies, such
as ADSL and cable modem technology, and easy distribution at all phone
connections. It is currently expected that CommHome's designs will be
incorporated into the Company's future security products.
 
EMPLOYEES
 
   
    As of October 20, 1998, the Company had 24 full time employees, including 6
in sales and marketing, 6 in product research and development, 8 in consulting
and technological support and 4 in administration and finance. None of the
Company's employees is represented by a labor union or is subject to a
collective bargaining agreement. The Company has not experienced any work
stoppages and considers its relationship with its employees to be good.
    
 
    Competition with respect to the recruiting of highly qualified personnel in
the software industry is intense and many of the Company's competitors have
significantly greater resources than the Company. The Company's ability to
attract and assimilate new personnel will be critical to the Company's
performance and there can be no assurance that the Company will be successful in
attracting or retaining the personnel it requires to enhance its products,
develop new products and conduct its operations successfully.
 
                                       44
<PAGE>
FACILITIES
 
   
    The Company currently subleases on a month-to-month basis approximately 700
square feet of office space in Wellesley Hills, Massachusetts for its principal
executive offices. Following the consummation of this offering, the Company
intends to lease new principal executive offices in the Boston, Massachusetts
area. The Company's technical support, warehouse and distribution facilities are
located in Grand Prairie, Texas, where the Company leases approximately 7,500
square feet pursuant to a written lease which expires on July 31, 1999.
    
 
LEGAL PROCEEDINGS
 
    The Company is not a party to any material legal proceedings.
 
                                       45
<PAGE>
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
    The executive officers and directors of the Company are as follows:
 
   
<TABLE>
<CAPTION>
NAME                                                       AGE      POSITION
- -----------------------------------------------------      ---      -----------------------------------------------------
<S>                                                    <C>          <C>
Avi A. Fogel.........................................          44   President, Chief Executive Officer and Director
William Hancock......................................          41   Chief Technology Officer and Director
Robert P. Olsen......................................          44   Vice President of Product Management
Murray P. Fish.......................................          47   Chief Financial Officer
Joseph A. Donohue....................................          45   Vice President of Engineering
Joseph D. Harris.....................................          42   Vice President of International Sales
Robert M. Russo......................................          48   Vice President of Business Development and Secretary
Corey M. Horowitz....................................          43   Chairman of the Board of Directors
Marcus J. Ranum......................................          35   Director
Barry Rubenstein.....................................          55   Director
Irwin Lieber.........................................          59   Director
</TABLE>
    
 
    AVI A. FOGEL has served as President, Chief Executive Officer and a director
since May 1998. From March 1998 until May 1998, Mr. Fogel served as a consultant
to the Company. From June 1997 until the consummation of this offering, Mr.
Fogel served as President and Chief Executive Officer of CommHome, a development
stage company engaged in the business of developing residential networking
solutions, which he co-founded in June 1997. From January 1997 to June 1997, Mr.
Fogel was engaged in pre-incorporation activities related to CommHome. Effective
upon the consummation of this offering, CommHome will be acquired by the
Company. From October 1995 to December 1996, Mr. Fogel was employed by Digital
Equipment Corp. as Vice President, Global Marketing. From July 1994 to October
1995, Mr. Fogel was Executive Vice President, Global Marketing and Business
Development of LANNET Data Communications, Ltd., a manufacturer of LAN switching
hubs located in Tel Aviv, Israel. From July 1990 to July 1994, Mr. Fogel served
as President and Chief Executive Officer of LANNET, Inc., the U.S. subsidiary of
LANNET Data Communications, Ltd.
 
    WILLIAM HANCOCK co-founded the Company and has served as its Chief
Technology Officer since May 1998 and as a director since inception. From
inception until May 1998, Mr. Hancock served as Executive Vice President and
Secretary. Mr. Hancock is a leading international expert in computer and network
design and security with over 20 years of experience in computer science,
network technologies and electrical engineering. From June 1982 to July 1990,
Mr. Hancock was an independent computer and networking consultant to Fortune 500
companies, including Digital Equipment Corporation, AT&T and IBM. Mr. Hancock
participated in the operating system and network design teams at both Digital
Equipment Corporation and IBM. He was instrumental in the design and selection
of the Integrated System Digital Network plug connector and is the author of the
implementation of the RSA encryption algorithm for the CCITT X.32 network
standard. Mr. Hancock has been involved in the architecture and writing of the
networking and security standards for the International Organization for
Standardization. Mr. Hancock is a Certified Information Systems Security
Professional.
 
    ROBERT P. OLSEN has served as Vice President of Product Management since May
1998. From March 1998 until May 1998, Mr. Olsen served as a consultant to the
Company. From July 1997 to December 1997, Mr. Olsen served as Vice President of
Marketing of CommHome. From July 1996 to July 1997, Mr. Olsen was Vice President
of Marketing for Netphone, Inc., a developer of computer servers. From December
1991 to June 1996, Mr. Olsen was Vice President of Marketing for Agile Networks,
Inc., a
 
                                       46
<PAGE>
company engaged in the design manufacturing, marketing and support of ethernet
and ATM switches, which he co-founded.
 
    MURRAY P. FISH has served as Chief Financial Officer since May 1998. From
August 1997 to May 1998, Mr. Fish was an independent financial consultant. From
April 1991 to August 1997, Mr. Fish served as President, Chief Executive Officer
and a director of RealWorld Corporation, a manufacturer of accounting software.
From March 1989 to April 1991, Mr. Fish served as Vice President and Controller
of Goldman Financial Group, Inc., a manufacturer of chemical and machine tools.
 
    JOSEPH A. DONOHUE has served as Vice President of Engineering since July
1998. From April 1987 to July 1998, Mr. Donohue was employed by Stratus Computer
Inc., having held the positions of Director-- Windows/NT Software Development
from November 1997 to July 1998, Director--Proprietary OS from July 1994 to
November 1997 and Manager--Kernel Development from July 1993 to July 1994. From
April 1987 to July 1993, Mr. Donohue was employed by Stratus Computer, Inc. in
various engineering positions.
 
    JOSEPH D. HARRIS has served as Vice President of International Sales since
August 1998. From November 1996 until August 1998, Mr. Harris served as Vice
President of Sales and Managing Director-- Asia Pacific of Proginet Corporation,
a developer of cross-platform database technologies. From October 1990 until
November 1996, Mr. Harris served as President and Chief Executive Officer of
KnowledgeNet Incorporated, a company also engaged in development of
cross-platform database technologies, which he founded. Mr. Harris also served
as Director of Architecture for System Software Associates, Inc., a developer of
business planning software, from January 1988 to October 1990.
 
    ROBERT M. RUSSO co-founded the Company and has served as Vice President of
Business Development and Secretary since May 1998. Mr. Russo served as President
and a director of the Company from inception until May 1998, and as Chief
Operating Officer of the Company from December 1993 to May 1998. From May 1987
to June 1990, Mr. Russo served as Vice President of Sales and Marketing of
Essential Resources, Inc., a computer consulting and training company. From
December 1979 to February 1987, Mr. Russo served as President of the North
American Division of H&M Systems Software, Inc., a software developer.
 
    COREY M. HOROWITZ became Chairman of the Board of Directors of the Company
in January 1996 and has been a member of the Board of Directors since April
1994. Mr. Horowitz is a private investor and President and sole shareholder of
CMH Capital Management Corp., a New York investment advisory and merchant
banking firm, which he founded in September 1991. From January 1986 to February
1991, Mr. Horowitz was a general partner in charge of mergers and acquisitions
at Plaza Securities Co., a New York investment partnership. From July 1984 to
December 1985, Mr. Horowitz was a general partner at Lafer Amster & Co., an
investment partnership. From August 1980 to June 1984, Mr. Horowitz was an
associate at the New York law firm of Skadden, Arps, Slate, Meagher & Flom.
 
    MARCUS J. RANUM has served as a director of the Company since June 1998. Mr.
Ranum currently serves as President and Chief Executive Officer of Network
Flight Recorder, Inc., a development stage networking software company which he
founded in March 1996. From October 1994 to February 1996, Mr. Ranum served as
Chief Scientist and Executive Manager of V-One Corporation, a company engaged in
the development and marketing of network security products. From June 1994 to
October 1994, he served as a consultant in network security, software analysis
and testing, software development and related matters. From November 1992 to
June 1994, Mr. Ranum served as Senior Scientist of Trusted Information Systems,
Inc. From August 1991 to November 1993, Mr. Ranum served as a consultant to
Digital Equipment Corporation.
 
   
    BARRY RUBENSTEIN has served as a director of the Company since July 1998.
During the period March 1996 until July 1998, Mr. Rubenstein served as a member
of the Company's advisory board. Since June 1994, Mr. Rubenstein has served as
President, a director and a shareholder of InfoMedia Associates,
    
 
                                       47
<PAGE>
Ltd., which is a general partner of the 21st Century Communications Partners,
L.P. and affiliated partnerships. Mr. Rubenstein also serves as Chief Executive
Officer of Wheatley Partners, L.L.C., the general partner of Wheatley Partners,
L.P. and a general partner of Wheatley Foreign Partners, L.P. He is also a
general partner of Applewood Associates, L.P., Seneca Ventures and Woodland
Venture Fund, each of which is an investment partnership. Prior to his
experience as an investor, Mr. Rubenstein served as a co-founder of several
technology companies, including Applied Digital Data Systems, Inc., Cheyenne
Software, Inc. and Novell, Inc. Mr. Rubenstein also serves as a director of
Infonautics, Inc., The Millbrook Press, Inc., Source Media, Inc. and USWeb
Corporation.
 
   
    IRWIN LIEBER has served as a director of the Company since July 1998. During
the period March 1996 until July 1998, Mr. Lieber served as a member of the
Company's advisory board. Since 1979, he has served as Chairman and Chief
Executive Officer of GeoCapital LLC, an investment advisory firm which he
founded. Mr. Lieber is also a general partner of Applewood Associates, L.P., and
a principal of 21st Century Communications, L.P., each of which is an investment
partnership. Mr. Lieber also serves as President of Wheatley Partners, LLC, the
general partner of Wheatley Partners, L.P. and a general partner of Wheatley
Foreign Partners, both of which are investment partnerships. Mr. Lieber also
serves as a director of LeaRonal Inc. and Giga Information Group, Inc.
    
 
    All Directors serve until the next annual meeting of stockholders and the
election and qualification of their successors. Executive officers are elected
by, and serve at the discretion of, the Board of Directors. Corey M. Horowitz
was elected a director pursuant to a stockholders' agreement which provided that
certain principal stockholders agreed to vote their shares to elect Mr. Horowitz
to the Board of Directors. The stockholders' agreement terminates upon the
effective date of the offering. There are no family relationships among any of
the Company's directors or executive officers.
 
    The Company has agreed, for a period of five years from the date of this
Prospectus, if so requested by the Underwriter, to nominate and use its best
efforts to elect a designee of the Underwriter as a director of the Company or,
at the Underwriter's option, as a non-voting advisor to the Company's Board of
Directors. The Company's officers, directors and principal stockholders have
agreed to vote their shares of Common Stock in favor of such designee. The
Underwriter has not yet exercised and currently does not intend to exercise its
right to designate such a person.
 
BOARD COMMITTEES
 
    In August 1998, the Board of Directors established an Audit Committee,
consisting of Irwin Lieber, Marcus Ranum and Avi Fogel, and a Compensation
Committee, consisting of Corey M. Horowitz and Barry Rubenstein. The Audit
Committee will review the qualifications of the Company's independent auditors,
make recommendations to the Board of Directors regarding the selection of
independent auditors, review the scope, fees and results of any audit, and
review non-audit services and related fees provided by the independent auditors.
The Compensation Committee will be responsible for determining compensation for
the executive officers of the Company, including bonuses and benefits, and will
administer the Company's compensation programs, including the Stock Option Plan.
 
    The Board of Directors does not have a nominating committee. The selection
of nominees for the Board of Directors is made by the entire Board of Directors.
The Board of Directors may from time to time establish other committees to
facilitate the management of the Company.
 
DIRECTOR COMPENSATION
 
    To date, directors of the Company have received no cash compensation for
their services as directors. The Company does not currently compensate directors
who are also employees of the Company for service on the Board of Directors. All
Directors are reimbursed for their expenses incurred in attending meetings of
the Board of Directors and its committees. Each non-employee director first
joining the Board of Directors in the future will be granted an option to
purchase 20,000 shares of Common Stock when such
 
                                       48
<PAGE>
director is first elected or appointed to the Board of Directors, with the
option shares vesting over a one year period in equal quarterly amounts, under
the Stock Option Plan. In addition, each non-employee director will receive an
automatic option grant to purchase 5,000 shares of Common Stock on each year
anniversary that such director is a member of the Board of Directors with the
option shares vesting over a one year period in equal quarterly amounts, under
the Stock Option Plan. All option grants to non-employee directors will be at a
per share exercise price equal to the fair market value of the Common Stock at
the time of grant. See "Management--Stock Option Plan."
 
EXECUTIVE COMPENSATION
 
    The following table sets forth the compensation paid by the Company in all
capacities during the year ended December 31, 1997 to its then President and
Chief Operating Officer and to each of its executive officers whose compensation
for such year exceeded $100,000.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                             LONG TERM
                                                                                           COMPENSATION
                                                                                              AWARDS
                                                                                           -------------
                                                                   ANNUAL COMPENSATION        SHARES
                                                 YEAR ENDED     -------------------------   UNDERLYING        ALL OTHER
NAME AND PRINCIPAL POSITION(1)                  DECEMBER 31,    SALARY ($)    BONUS ($)     OPTIONS(#)      COMPENSATION
- ---------------------------------------------  ---------------  ----------  -------------  -------------  -----------------
<S>                                            <C>              <C>         <C>            <C>            <C>
Robert Russo,................................          1997     $  145,000(2)      --           --               --
  President and Chief Operating Officer
William Hancock,.............................          1997        160,000(3)      --           --               --
  Executive Vice President
Peter Mearsheimer,...........................          1997        155,000(4)      --           21,728           --
  Vice President of Sales
</TABLE>
 
- ------------------------
(1) Does not include the following executive officers who were employed by the
    Company beginning in 1998 and are receiving annual compensation in excess of
    $100,000: Avi A. Fogel, President and Chief Executive Officer; Robert P.
    Olsen, Vice President of Product Management; Murray P. Fish, Chief Financial
    Officer; Joseph D. Harris, Vice President of International Sales; and Joseph
    A. Donohue, Vice President of Engineering. See "Employment Agreements."
 
(2) Includes $51,692 of deferred salary.
 
(3) Includes $6,154 of deferred salary.
 
(4) Includes $5,962 of deferred salary. Effective August 1998, Mr. Mearsheimer
    was no longer employed by the Company.
 
    The following table provides information relating to stock options awarded
to each of the executive officers during the year ended December 31, 1997. All
such options were awarded under the Stock Option Plan.
 
<TABLE>
<CAPTION>
                                                                           OPTION GRANTS IN 1997
                                                      ----------------------------------------------------------------
<S>                                                   <C>              <C>                    <C>          <C>
                                                         NUMBER OF          % OF TOTAL
                                                          SHARES        OPTIONS GRANTED TO     EXERCISE
                                                        UNDERLYING           EMPLOYEES         PRICE PER   EXPIRATION
NAME                                                  OPTIONS GRANTED       IN 1997(1)         SHARE (2)      DATE
- ----------------------------------------------------  ---------------  ---------------------  -----------  -----------
Peter Mearsheimer(3)................................         3,104                   2%        $    6.44     5/12/2006
                                                            18,624                  15%        $    4.83     9/15/2007
</TABLE>
 
- ------------------------
(1) The number of options granted to employees during 1997 used to compute this
    percentage excludes options to purchase 35,075 shares of Common Stock due to
    the termination of such options pursuant to their terms.
 
(2) Options were granted at an exercise price equal to the fair market value of
    the Company's Common Stock on the date of grant, as determined by the Board
    of Directors.
 
   
(3) Mr. Mearsheimer was no longer employed by the Company effective August 1998,
    and his options expired in September 1998.
    
 
                                       49
<PAGE>
EMPLOYMENT AGREEMENTS
 
    On May 18, 1998, the Company entered into an employment agreement with Avi
A. Fogel, pursuant to which Mr. Fogel serves as the Company's Chief Executive
Officer and President for a four year term at an annual base salary of $150,000
per year subject to annual increases in base salary of up to 20% at the
discretion of the Compensation Committee of the Board of Directors. Mr. Fogel is
eligible to receive an additional cash bonus of up to $50,000 as determined by
the Compensation Committee of the Board of Directors in its discretion. In
addition, upon execution of his employment agreement, Mr. Fogel received five
year options to purchase 294,879 shares of the Company's common stock at an
exercise price of $2.42 per share. The options granted to Mr. Fogel vested as to
34% of the shares covered thereby at the time of execution of his employment
agreement and vest as 22% of the shares covered thereby on each of the first
three anniversaries thereafter, subject to acceleration upon a change of control
of the Company. In the event Mr. Fogel's employment agreement is terminated
"other than for cause" (as defined in the agreement), he shall be entitled to
(i) the vesting of all options in the year of termination and 50% of the options
that would have vested in the year following termination and (ii) the lesser of
one year's base salary or the base salary for the balance of the term of the
agreement. Mr. Fogel has agreed not to disclose any confidential information of
the Company during the term of his employment or at any time thereafter or to
compete with the Company during the term of his agreement and for a period of
two years thereafter in the event of termination for cause.
 
    On June 30, 1998, the Company entered into an employment agreement with Mr.
William Hancock pursuant to which Mr. Hancock agreed to continue to serve as the
Company's Chief Technology Officer for a three year term at an annual salary of
$160,000 per annum, subject to additional bonus compensation as determined by
the Compensation Committee of the Board of Directors in its discretion. In the
event Mr. Hancock's employment is terminated for cause (as defined in the
agreement), the Company will have the right to repurchase 50% of the securities
owned by him at the time at a purchase price of $1.00 per share. In the event
Mr. Hancock's employment agreement is terminated "other than for cause" (as
defined in the agreement), he shall be entitled to receive the lesser of six
months base salary or the base salary for the balance of the term of the term of
the agreement. Mr. Hancock has agreed not to disclose any confidential
information of the Company during the term of his employment or at anytime
thereafter or to compete with the Company during the term of his agreement and
for a period of two years thereafter in the event of termination for cause.
 
    On May 18, 1998, the Company entered into an employment agreement with
Robert P. Olsen pursuant to which Mr. Olsen agreed to serve as the Company's
Vice President of Product Management for a three year term at an annual salary
of $120,000 per annum, subject to an additional cash bonus of $30,000 as
determined by the Compensation Committee of the Board of Directors in its
discretion. Upon execution of his employment agreement, Mr. Olsen received an
incentive stock option to purchase 58,976 shares of the Company's common stock
at an exercise price of $5.60 per share. The options granted to Mr. Olsen vested
as to 34% of the shares covered thereby upon execution of the agreement and 22%
of the shares covered thereby on each of the first three anniversaries
thereafter, subject to acceleration upon a change of control of the Company. In
the event Mr. Olsen's employment agreement is terminated "other than for cause"
(as defined in the agreement), he shall be entitled to (i) the vesting of all
options in the year of termination and 50% of the options that would have vested
in the year following termination and (ii) the lesser of one year base salary or
the base salary for the balance of the term of the agreement. Mr. Olsen has
agreed not to disclose any confidential information of the Company during the
term of his employment or at anytime thereafter or to compete with the Company
during the term of his agreement and for a period of two years thereafter in the
event of termination for cause.
 
    On May 19, 1998, the Company entered into an employment agreement with
Murray P. Fish pursuant to which Mr. Fish agreed to serve as the Company's Chief
Financial Officer for a three year term at an annual salary of $120,000 per
annum, subject to an additional cash bonus of $30,000 as determined by
Compensation Committee of the Board of Directors in its discretion. Upon
execution of his employment
 
                                       50
<PAGE>
agreement, Mr. Fish received an incentive stock option to purchase 58,500 shares
of the Company's common stock at an exercise price of $5.60 per share. The
options granted to Mr. Fish vested as to 34% of the shares covered thereby upon
execution of the agreement and vest as to 22% on each of the first three
anniversaries thereafter, subject to acceleration upon a change of control of
the Company. In the event Mr. Fish's employment agreement is terminated "other
than for cause" (as defined in the agreement), he shall be entitled to (i) the
vesting of all options in the year of termination and 50% of the options that
would have vested in the year following termination and (ii) the lesser of six
months base salary or the base salary for the balance of the term of the
agreement. Mr. Fish has agreed not to disclose any confidential information of
the Company during the term of his employment or at anytime thereafter or to
compete with the Company during the term of his agreement and for a period of
two years thereafter in the event of termination for cause.
 
   
    On July 31, 1998, the Company entered into an employment agreement with
Joseph A. Donohue pursuant to which Mr. Donohue agreed to serve as the Company's
Vice President of Engineering for a three year term at an annual salary of
$120,000 per annum, subject to an additional cash bonus of $30,000 as determined
by the Compensation Committee of the Board of Directors in its discretion. In
connection with his employment, Mr. Donohue received an incentive stock option
to purchase 62,500 shares of the Company's common stock at an exercise price of
$6.00 per share. The options granted to Mr. Donohue vested as to 34% of the
shares covered thereby upon execution of the agreement and 22% of the shares
covered thereby on each of the first three anniversaries thereafter, subject to
acceleration upon a change of control of the Company. In the event Mr. Donohue's
employment agreement is terminated "other than for cause" (as defined in the
agreement), he shall be entitled to (i) the vesting of all options in the year
of termination and 50% of the options that would have vested in the year
following termination and (ii) the lesser of six months base salary or the base
salary for the balance of the term of the agreement. Mr. Donohue has agreed not
to disclose any confidential information of the Company during the term of his
employment or at anytime thereafter or to compete with the Company during the
term of his agreement and for a period of two years thereafter in the event of
termination for cause.
    
 
   
    On August 24, 1998, the Company entered into an employment agreement with
Joseph D. Harris pursuant to which Mr. Harris agreed to serve as the Company's
Vice President of International Sales for a three year term at an annual salary
of $120,000 per annum, subject to an additional cash bonus of $30,000 as
determined by Compensation Committee of the Board of Directors in its
discretion. In connection with his employment, Mr. Harris received an incentive
stock option to purchase 40,000 shares of the Company's common stock at an
exercise price of $6.00 per share. The options granted to Mr. Harris vested as
to 25% of the shares covered thereby upon execution of the agreement and vest as
to 25% on each of the first three anniversaries thereafter, subject to
acceleration upon a change of control of the Company. In the event Mr. Harris'
employment agreement is terminated "other than for cause" (as defined in the
agreement), he shall be entitled to (i) the vesting of all options in the year
of termination and 50% of the options that would have vested in the year
following termination and (ii) the lesser of six months base salary or the base
salary for the balance of the term of the agreement. Mr. Harris has agreed not
to disclose any confidential information of the Company during the term of his
employment or at anytime thereafter or to compete with the Company during the
term of his agreement and for a period of two years thereafter in the event of
termination for cause.
    
 
    On April 4, 1994, the Company entered into an employment agreement with
Robert M. Russo pursuant to which Mr. Russo agreed to then serve as the
Company's President and Chief Operating Officer for a three year term at a base
salary of $145,000 per annum, subject to an additional cash bonus as determined
by the Board of Directors in its discretion. In February 1996, the Company and
Mr. Russo agreed to extend the term of his employment agreement, upon the same
terms and conditions, expiring April 1999. In accordance with his agreement, Mr.
Russo has agreed not to disclose any confidential information of the Company
during the term of his employment or at anytime thereafter or to compete with
the Company during the term of his agreement and for a period of two years
thereafter in the event of
 
                                       51
<PAGE>
termination for cause. In May 1998, Mr. Russo agreed to serve the Company for
the balance of the term of his employment agreement as its Vice President of
Business Development at a base salary of $120,000 per annum, subject to an
additional cash bonus of $30,000 as determined by the Compensation Committee of
the Board of Directors.
 
    The Company's aggregate salary commitment pursuant to employment agreements
with the foregoing officers is $804,000, $820,000, $790,000, $470,000 and
$56,000 for the years ending December 31, 1998, 1999, 2000, 2001 and 2002,
respectively.
 
STOCK OPTION PLAN
 
    On March 7, 1996, the Board of Directors and stockholders of the Company
approved the adoption of the Stock Option Plan. The Stock Option Plan, as
amended, is intended to assist the Company in securing and retaining key
employees, directors and consultants by allowing them to participate in the
ownership and growth of the Company through the grant of incentive and
non-qualified options (collectively, the "Options"). Under the Stock Option
Plan, key employees (including officers and employee directors) are eligible to
receive grants of incentive stock options. Employees (including officers),
directors of the Company or any affiliates and consultants are eligible to
receive grants of non-qualified options. Incentive stock options granted under
the Stock Option Plan are intended to be "Incentive Stock Options" as defined by
Section 422 of the Internal Revenue Code of 1986, as amended.
 
    The Stock Option Plan has been administered by the Board of Directors and
following the consummation of this offering will be administered by the
Compensation Committee of the Board of Directors of the Company. The
Compensation Committee of the Board of Directors will consist of members who
have been determined by the Board of Directors to be "disinterested persons"
within the meaning of Rule 16b-3(c)(2)(i) promulgated under the Exchange Act or
any future corresponding rule.
 
    The Compensation Committee will determine who shall receive Options, the
number of shares of Common Stock that may be purchased under the Options, the
time and manner of exercise of Options and exercise prices. The term of Options
granted under the Stock Option Plan may not exceed 10 years (five years in the
case of an incentive stock option granted to an optionee owning more than 10% of
the voting stock of the Company) (a "10% Holder"). The exercise price for
incentive stock options shall not be less than 100% of the "fair market value"
of the shares of Common Stock at the time the Option is granted; provided,
however, that with respect to an incentive stock option, in the case of a 10%
Holder, the purchase price per share shall be at least 110% of such fair market
value. The exercise price for non-qualified options is set by the Compensation
Committee in its discretion. The aggregate fair market value of the shares of
Common Stock as to which an optionee may exercise incentive stock options may
not exceed $100,000 in any calendar year. Payment for shares purchased upon
exercise of Options is to be made in cash, check or other instrument, and at the
discretion of the Committee, may be made by delivery of other shares of Common
Stock of the Company. If any Option granted under the Plan expires or terminates
for any reason without having been exercised in full, then the unpurchased
shares subject to the Option will once again be available for additional Option
grants.
 
    Under certain circumstances involving a change in the number of outstanding
shares of Common Stock including a stock split, consolidation, merger or payment
of stock dividend, the class and aggregate number of shares of Common Stock in
respect of which Options may be granted under the Stock Option Plan, the class
and number of shares subject to each outstanding Option and the exercise price
per share will be proportionately adjusted.
 
   
    An aggregate of 1,050,000 shares of Common Stock has been reserved for
issuance upon exercise of the Options to be granted under the Stock Option Plan.
As of the date of this Prospectus, the Company has granted Options to purchase
855,216 shares of Common Stock under the Plan, of which Options to purchase
94,362, 94,185, 93,750, 88,464, 65,000, 25,000 and 25,000 shares of Common Stock
have been granted to Messrs. Olsen, Fish, Donohue, Fogel, Harris, Hancock and
Russo, respectively. The Options
    
 
                                       52
<PAGE>
   
granted to Messrs. Olsen and Fish are exercisable at a prices of $5.60 and $6.00
per share. The Options granted to Messers. Donohue, Fogel, Harris, Russo and
Hancock are exercisable at a price of $6.00 per share. In addition, each of the
non-employee directors, Messrs. Horowitz, Rubenstein, Lieber and Ranum, have
been granted Options to purchase 20,000 shares of Common Stock at $6.00 per
share.
    
 
401(K) PLAN
 
    The Company maintains the "Network-1 Security Solutions 401(k) Plan", a
defined contribution pension plan with a cash or deferred arrangement as
described in Section 401(k) of the Internal Revenue Code of 1986, as amended
(the "401(k) Plan"). The 401(k) Plan is intended to qualify under Section 401(a)
of the Code, so that contributions, and income earned thereon, are not taxable
to employees until withdrawn. All regular full-time Company employees over the
age of 21 are eligible to participate in the 401(k) Plan. The 401(k) Plan
provides that each participant may make elective pre-tax salary deferrals up to
15% of his or her annual compensation, subject to statutory limits. The Company
also may make discretionary annual matching contributions in amounts determined
by the Compensation Committee of the Board of Directors, subject to statutory
limits. The Company's policy is to base its contributions on Company
profitability. The Trustee of the 401(k) Plan invests each employee's account at
the direction of the employee, who may choose among several investment
alternatives, which do not include shares of the Company's Common Stock. The
Company did not make any contributions to the 401(k) Plan during 1997.
 
LIMITATION ON LIABILITY AND INDEMNIFICATION MATTERS
 
    The Company's Certificate of Incorporation limits the liability of directors
to the maximum extent permitted by Delaware law. Delaware law provides that
directors of a corporation will not be personally liable for monetary damages
for breach of their fiduciary duties as directors, except for liability (i) for
any breach of their duty of loyalty to the corporation or its stockholders, (ii)
for acts or omissions not in good faith or that involve intentional misconduct
or a knowing violation of law, (iii) for unlawful payments of dividends or
unlawful stock repurchases or redemptions as provided in Section 174 of the
Delaware General Corporation Law or (iv) for any transaction from which the
director derived an improper personal benefit.
 
    The Company's Bylaws provide that the Company shall indemnify its directors,
officers, employees and agents to the fullest extent permitted by law. The
Company's Bylaws also permit the Company to secure insurance on behalf of any
officer, director, employee or other agent for any liability arising out of his
or her actions in such capacity. The Company currently maintains liability
insurance for its officers and directors.
 
    At present, there is no pending material litigation or proceeding involving
any director, officer, employee or agent of the Company where indemnification
will be required or permitted. The Company is not aware of any threatened
litigation or proceeding that might result in a material claim for such
indemnification.
 
                                       53
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
   
    The following table sets forth certain information, as of the date of this
Prospectus (after giving effect to the Pro Forma Adjustments and the CommHome
Acquisition) and as adjusted to reflect the sale by the Company of 1,700,000
shares of Common Stock offered hereby, relating to the beneficial ownership of
shares of Common Stock by: (i) each person or entity who is known by the Company
to own beneficially five percent or more of the outstanding shares of Common
Stock; (ii) each director or person who has agreed to become a director of the
Company; (iii) the executive officers; and (iv) all directors and executive
officers of the Company as a group.
    
 
   
<TABLE>
<CAPTION>
                                                                         NUMBER OF           PERCENT OF SHARES
                                                                          SHARES           BENEFICIALLY OWNED (1)
                                                                        BENEFICIALLY ----------------------------------
NAME AND ADDRESS OF BENEFICIAL OWNER                                       OWNED      BEFORE OFFERING   AFTER OFFERING
- ----------------------------------------------------------------------  -----------  -----------------  ---------------
<S>                                                                     <C>          <C>                <C>
Applewood Associates, L.P. (2)........................................     954,659            29.6%             19.4%
Corey M. Horowitz (3).................................................     953,503            28.4              18.9
  CMH Capital Management Corp.
  Pisces Investors, L.P.
  Security Partners, L.P.
Robert Russo (4)......................................................     306,819             9.5               6.2
William Hancock (5)...................................................     243,557             7.5               4.9
Charles P. Stevenson, Jr. (6).........................................     187,316             5.8               3.8
Avi A. Fogel (7)......................................................     163,380             4.9               3.2
Barry Rubenstein (8)..................................................     150,112             4.6               3.0
Irwin Lieber (9)......................................................      77,944             2.4               1.6
Robert P. Olsen (10)..................................................      40,416             1.2                 *
Murray P. Fish (11)...................................................      32,023               *                 *
Joseph A. Donohue (12)................................................      31,875               *                 *
Joseph D. Harris (13).................................................      16,250               *                 *
Marcus Ranum (14).....................................................       5,000               *                 *
All directors and executive officers as group (11 persons)............   2,020,879            54.2%             37.2%
</TABLE>
    
 
- ------------------------
 
*   Less than 1%.
 
   
(1) Unless otherwise indicated, the Company believes that all persons named in
    the table have sole voting and investment power with respect to all shares
    of Common Stock beneficially owned by them. A person is deemed to be the
    beneficial owner of securities that can be acquired by such person within 60
    days from the date of this Prospectus upon the exercise of options, warrants
    or convertible securities. Each beneficial owner's percentage ownership is
    determined by assuming that options, warrants or convertible securities that
    are held by such person (but not those held by any other person) and which
    are exercisable within 60 days of the date of this Prospectus have been
    exercised and converted. Assumes a base of 3,225,467 shares of Common Stock
    outstanding prior to this offering (including 562,836 shares of Common Stock
    issuable upon conversion of shares of Series C Preferred Stock to be issued
    upon consummation of this offering) and a base of 4,925,467 shares of Common
    Stock outstanding immediately after this offering (including 562,836 shares
    of Common Stock issuable upon conversion of shares of Series C Preferred
    Stock to be issued upon consummation of this offering), before any
    consideration is given to outstanding options, warrants or convertible
    securities.
    
 
   
(2) Includes 382,696 shares of Common Stock issuable upon conversion of Series C
    Preferred Stock held by Applewood Associates, L.P. ("Applewood"). Does not
    include (i) 31,040, 23,280, 31,040, 4,656 and 3,104 shares of Common Stock
    held by Barry Rubenstein, Irwin Lieber, Barry Fingerhut, Seth Lieber and
    Jonathan Lieber, respectively, each of whom is a general partner of
    Applewood and (ii) an aggregate of 109,328 shares of Common Stock subject to
    currently exercisable warrants and options
    
 
                                       54
<PAGE>
   
    held by Barry Rubenstein (54,664 shares) and Irwin Lieber (54,664 shares).
    Each of Messrs. Rubenstein, I. Lieber, Fingerhut, S. Lieber and J. Lieber
    disclaims beneficial ownership of the shares held by Applewood, except to
    the extent of their equity interest therein. Applewood's business
    address is 80 Cuttermill Road, Great Neck, New York 11021.
    
 
   
(3) Includes (i) 374,906 shares of Common Stock held by Mr. Horowitz, (ii) 7,846
    shares of Common Stock issuable upon conversion of Series C Preferred Stock
    held by Mr. Horowitz, (iii) 5,000 shares of Common Stock subject to
    currently exercisable stock options issued to Mr. Horowitz, (iv) 206,933
    shares of Common Stock issuable upon conversion of Series B Convertible
    Preferred Stock held by Pisces Investors, L.P., a limited partnership whose
    general partner is CMH Capital Management Corp. ("CMH"), a corporation whose
    sole stockholder and officer is Mr. Horowitz, (v) 145,887 shares of Common
    Stock (including 62,080 shares of Common Stock issuable upon conversion of
    Series B Convertible Preferred Stock) owned by Security Partners, L.P. (CMH
    is the general partner of Security Partners, L.P. and Mr. Horowitz is a
    limited partner), (vi) 55,320 shares of Common Stock held by CMH, (vii)
    32,675 shares of Common Stock issuable upon conversion of Series C Preferred
    Stock held by CMH and (viii) 124,936 shares of Common Stock subject to
    currently exercisable warrants held by CMH. Does not include 15,000 shares
    of Common Stock subject to stock options which are not currently
    exercisable. Mr. Horowitz disclaims beneficial ownership of the shares held
    by Pisces Investors, L.P. and Security Partners, L.P. except to the extent
    of his equity interest therein. The address of CMH Capital Management Corp.
    is 885 Third Avenue, New York, New York 10022 and the address of Pisces
    Investors, L.P. and Security Partners, L.P. is c/o CMH Capital Management
    Corp., 885 Third Avenue, New York, New York 10022.
    
 
   
(4) Includes 8,500 shares of Common Stock subject to currently exercisable stock
    options issued to Mr. Russo pursuant to the Stock Option Plan. Does not
    include 16,500 shares of Common Stock subject to stock options which are not
    current exercisable.
    
 
   
(5) Includes 8,500 shares of Common Stock subject to currently exercisable stock
    options issued to Mr. Hancock pursuant to the Stock Option Plan. Does not
    include 16,500 shares of Common Stock subject to stock options which are not
    current exercisable.
    
 
   
(6) Includes (i) 16,586, 50,432 and 7,064 shares of Common Stock held by Mr.
    Stevenson, Navigator Fund, L.P. and Navigator Global Fund, respectively,
    issuable upon conversion of Series C Preferred Stock and (ii) 47,990, 6,039
    and 49,381 shares of Common Stock held by Navigator Fund, L.P., Navigator
    Global Fund and CAPCOR Employee Pension Plan, respectively. Mr. Stevenson is
    the President and sole stockholder of the general partner of Navigator Fund,
    L.P. and Navigator Global Fund. Mr. Stevenson is also the trustee and
    beneficiary of CAPCOR Employee Pension Plan. The address of Mr. Stevenson,
    Navigator Fund, L.P., Navigator Global Fund and CAPCOR Employee Pension Plan
    is 45 Rockefeller Plaza, Suite 1776, New York, New York 10111.
    
 
   
(7) Includes (i) 130,337 shares of Common Stock subject to currently exercisable
    stock options, (ii) 23,876 shares of Common Stock to be issued to Mr. Fogel
    in connection with the CommHome Acquisition and (iii) 9,167 shares of Common
    Stock to be issued to Mr. Fogel in satisfaction of indebtedness owed to Mr.
    Fogel by CommHome. Does not include 253,006 shares subject to stock options
    which are not currently exercisable.
    
 
   
(8) Includes (i) 54,664 shares of Common Stock subject to currently exercisable
    warrants and options owned by Mr. Rubenstein, and (ii) 41,128 and 23,280
    shares of Common Stock held by Woodland Venture Fund and Seneca Ventures,
    respectively. Barry Rubenstein and Woodland Services Corp. are the general
    partners of Woodland Venture Fund and Seneca Ventures. Barry Rubenstein is
    also President and sole director of Woodland Services Corp. Does not include
    (i) 571,963 shares of Common Stock held by Applewood, of which Mr.
    Rubenstein is a general partner, (ii) 382,696 shares of Common Stock
    issuable upon conversion of Series C Preferred Stock held by Applewood and
    (iii) 15,000 shares of Common Stock subject to stock options which are not
    currently exercisable. Mr. Rubenstein disclaims beneficial ownership of the
    shares of Common Stock held by Applewood,
    
 
                                       55
<PAGE>
   
    except the extent of his equity interest therein. The address of Woodland
    Venture Fund and Seneca Ventures is c/o Barry Rubenstein, 68 Wheatley Road,
    Brookville, New York 11545.
    
 
   
(9) Includes 54,664 shares of Common Stock subject to currently exercisable
    warrants and options owned by Mr. Lieber. Does not include (i) 571,963
    shares of Common Stock held by Applewood, of which Mr. Lieber is a general
    partner, (ii) 382,696 shares of Common Stock issuable upon conversion of
    Series C Preferred Stock held by Applewood and (iii) 15,000 shares of Common
    Stock subject to stock options which are not currently exercisable. Mr.
    Lieber disclaims beneficial ownership of the shares of Common Stock held by
    Applewood, except to the extent of his equity interest therein.
    
 
   
(10) Includes (i) 32,083 shares of Common Stock subject to currently exercisable
    stock options issued to Mr. Olsen pursuant to the Stock Option Plan and (ii)
    8,333 shares of Common Stock to be issued to Mr. Olsen in satisfaction of
    indebtedness owed to Mr. Olsen by CommHome. Does not include 62,279 shares
    of Common Stock subject to stock options which are not currently
    exercisable.
    
 
   
(11) Includes 32,023 shares of Common Stock subject to stock options issued to
    Mr. Fish pursuant to the Stock Option Plan. Does not include 62,162 shares
    of Common Stock subject to stock options which are not currently
    exercisable.
    
 
   
(12) Includes 31,875 shares of Common Stock subject to stock options issued to
    Mr. Donohue pursuant to the Stock Option Plan. Does not include 61,875
    shares of Common Stock subject to stock options which are not currently
    exercisable.
    
 
   
(13) Includes 16,250 shares of Common Stock subject to stock options issued to
    Mr. Harris pursuant to the Stock Option Plan. Does not include 48,750 shares
    of Common Stock subject to stock options which are not currently
    exercisable.
    
 
   
(14) Includes 5,000 shares of Common Stock subject to stock options issued to
    Mr. Ranum pursuant to the Stock Option Plan. Does not include 15,000 shares
    of Common Stock subject to stock options which are not currently
    exercisable.
    
 
                                       56
<PAGE>
                              CERTAIN TRANSACTIONS
 
   
    In February and April 1997, the Company issued an aggregate principal amount
of $1,000,000 of notes bearing interest at the rate of 6% per annum, and
warrants to purchase an aggregate of 139,679 shares of the Company's Common
Stock at an exercise price of $6.44 per share in private financings (the
"February and April 1997 Private Financings"). In connection with the February
and April 1997 Private Financings, the Company issued (i) promissory notes in
the aggregate principal amount of $450,000 and warrants to purchase an aggregate
of 62,856 shares of Common Stock to Charles P. Stevenson, Jr., Navigator Fund
L.P. and Navigator Global Fund, (ii) a promissory note in the principal amount
of $250,000 and warrants to purchase 34,920 shares of Common Stock to Applewood
Associates, L.P. ("Applewood"), a principal stockholder of the Company, and
(iii) a promissory note in the principal amount of $50,000 and warrants to
purchase 6,984 shares of Common Stock to Herb Karlitz. Charles P. Stevenson, Jr.
is a principal stockholder of the Company and the President and sole stockholder
of the general partner of Navigator Fund, L.P. and Navigator Global Fund. Barry
Rubenstein, a director and a principal stockholder of the Company, and Irwin
Lieber, a director of the Company, are general partners of Applewood. Herb
Karlitz is the brother-in-law of Corey M. Horowitz, Chairman of the Board of
Directors and a principal stockholder of the Company. In connection with the
February and April 1997 Private Financings, Robert Russo, Vice President of
Business Development and Secretary of the Company, delivered to the Company for
cancellation 39,110 shares of Common Stock in consideration of $630, and William
H. Hancock, Chief Technology Officer and a director of the Company, delivered to
the Company for cancellation 54,009 shares of Common Stock in consideration of
$870.
    
 
   
    On August 30, 1996 the Company entered into an agreement (the "CMH Advisory
Agreement"), as amended, with CMH Capital Management Corp. ("CMH"), a
corporation wholly-owned by Corey M. Horowitz, pursuant to which CMH agreed to
render advisory services to the Company in consideration of fees of $12,500 per
month for a period of two years and the issuance of warrants to purchase 31,040
shares of the Company's Common Stock at an exercise price of $8.05 per share and
31,040 shares of the Company's Common Stock at an exercise price of $6.44 per
share (collectively, the "CMH Advisory Warrants"). In addition, the Company
agreed that in the event it completes a merger or sale of substantially all of
its assets prior to January 15, 2001, CMH would be entitled to a cash fee equal
to 2% of the value of the total consideration received in connection with such
transaction. CMH agreed that the monthly fee of $12,500 would accrue until the
Company completed a financing of a minimum of $5,000,000. On May 14, 1998, CMH
agreed with the Company to convert accrued fees of $200,000 into 31,250 shares
of Common Stock of the Company in full satisfaction of the Company's monthly fee
obligation to CMH under the CMH Advisory Agreement.
    
 
    On August 8, 1997, CMH loaned the Company $100,000 at an interest rate of 8%
per annum. As further consideration for such loan, the Company agreed to reduce
the exercise price of all of the CMH Advisory Warrants to $3.22 per share. In
addition, the Company agreed to reduce the exercise price of warrants to
purchase 124,159 shares of Common Stock at an exercise price of $3.22 per share
previously issued to Corey M. Horowitz on November 29, 1995 to $1.61 per share.
 
   
    On September 26, 1997, the Company issued to Applewood and CMH, principal
stockholders of the Company, notes in the principal amounts of $350,000 and
$50,000, respectively, bearing interest at the rate of 8% per annum, and
warrants to purchase 62,080 and 8,869 shares of Common Stock, respectively (the
"September 1997 Private Financing"). In connection with the September 1997
Private Financing, Robert Russo, Vice President of Business Development and
Secretary of the Company, William Hancock, Chief Technology Officer and a
director of the Company, and Kenneth Conquest, then Vice President of
Engineering of the Company, delivered to the Company for cancellation 112,373,
86,112 and 10,103 shares of Common Stock, respectively, for an aggregate
consideration of $3,360.
    
 
    On November 21, 1997, CMH loaned the Company $50,000 at an interest rate of
8% per annum pending the Company's receipt of a certain accounts receivable. As
additional consideration for the loan,
 
                                       57
<PAGE>
the Company agreed to further reduce the exercise price of the CMH Advisory
Warrants to $1.61 per share from $3.22 per share. The aforementioned loan was
repaid in full by the Company on December 12, 1997.
 
   
    From March 2, 1998 through May 14, 1998, the Company issued an aggregate
principal amount of $1,750,000 of notes, bearing interest at the rate of 8% per
annum, and warrants to purchase up to 325,919 shares of Common Stock at an
exercise price of $4.83 per share (the "1998 Private Financing"). In connection
with the 1998 Private Financing, Applewood purchased a $1,300,000 principal
amount note and warrants to purchase 242,111 shares of Common Stock, CMH
purchased a $50,000 note and warrants to purchase 9,312 shares of Common Stock,
Mr. Horowitz purchased a $50,000 principal amount note and warrants to purchase
9,312 shares of Common Stock and each of Herb Karlitz and Robert Graifman,
brothers-in-law of Mr. Horowitz, purchased a $25,000 principal amount note and
warrants to purchase 4,656 shares of Common Stock, at purchase prices of
$1,300,000, $50,000, $50,000, $25,000 and $25,000, respectively. In connection
with the 1998 Private Financing, Messrs. Russo and Hancock delivered to the
Company for cancellation 38,800 and 23,280 shares of Common Stock, respectively,
for an aggregate consideration of $1,000.
    
 
    As part of the 1998 Private Financing, in consideration of Applewood's
investment of $1,000,000 in May 1998, the Company, CMH and Applewood entered
into an advisory agreement, which amended the CMH Advisory Agreement, pursuant
to which the Company agreed to increase the cash fee payable to CMH, if the
Company completes a merger or sale of all or substantially all its assets at any
time up to January 15, 2001, from 2% to 3% of the value of the total
consideration received by the Company, and CMH agreed to share such
consideration with Applewood. As further consideration for Applewood's
$1,000,000 investment in May 1998, each of CMH, Mr. Horowitz, Pisces Investors,
L.P., Security Partners, L.P., Messrs. Russo, Hancock and Conquest agreed that
for a period of 24 months from the consummation of this offering, they would not
sell in the public market any securities of the Company owned by them without
the consent of Applewood, unless 60% of the securities owned by Applewood and
affiliated parties have been sold.
 
    On July 8, 1998, the Company entered into an exchange agreement with certain
holders of outstanding warrants and options to which the Company issued an
aggregate of 596,741 shares of its Common Stock in exchange for cancellation of
outstanding warrants and options to purchase 789,521 shares of the Company's
Common Stock. Pursuant to such agreement, Applewood exchanged warrants to
purchase 339,111 shares of Common Stock, at exercise prices of $4.83 and $6.44
per share, for 261,565 shares of Common Stock, Mr. Horowitz and CMH, exchanged
warrants to purchase an aggregate of 151,652 shares of Common Stock, at exercise
prices ranging from $1.61 to $4.83, for 131,207 shares of Common Stock and Herb
Karlitz exchanged warrants to purchase 11,640 shares of Common Stock, at
exercise prices of $4.83 and $6.44 per share, for 8,572 shares of Common Stock.
 
   
    On September 11, 1998, the Company entered into a merger agreement with
CommHome Systems Corporation ("CommHome"), effective upon consummation of this
offering, pursuant to which the CommHome stockholders have agreed to exchange
all of the outstanding common stock of CommHome for 46,667 shares of Common
Stock of the Company valued at $280,000. The Company will assume liabilities of
CommHome on the effective date of the merger of approximately $200,000, which
include $55,000 and $50,000 owed to Avi A. Fogel and Robert P. Olsen,
respectively. Messrs. Fogel and Olsen have agreed to accept 9,167 and 8,333
shares, respectively, of the Company's Common Stock in full satisfaction of such
indebtedness. Avi A. Fogel, President, Chief Executive Officer and a director of
the Company, is also President, Chief Executive Officer and a director of
CommHome and owns 51% of the outstanding shares of CommHome. Mr. Olsen, Vice
President of Product Management of the Company, is the former Vice President of
Marketing of CommHome.
    
 
   
    On October 1, 1998, the Company entered into an agreement with CMH to
provide financial advisory services for the three-month period ending December
31, 1998 for which CMH received 10,000 shares of Common Stock.
    
 
                                       58
<PAGE>
   
    On October 19, 1998, Applewood loaned the Company $75,000 at an interest
rate of 10% per annum which will be paid upon consummation of this offering.
    
 
   
    On October 20, 1998, the Company entered into an agreement, effective upon
consummation of this offering, with certain of its holders of outstanding
promissory notes, including accrued interest, of $3,204,888, pursuant to which
the Company will issue 562,836 shares of Series C Preferred Stock in exchange
for the cancellation of promissory notes, including accrued interest, of
$2,954,888, subject to adjustment in the event the Underwriter's over-allotment
option is exercised as described below. In accordance with the agreement,
Applewood will receive 382,696 shares of Series C Preferred Stock in exchange
for the cancellation of promissory notes, including accrued interest, of
$2,009,156, Mr. Horowitz and CMH will receive an aggregate of 40,521 shares of
Series C Preferred Stock in exchange for the cancellation of promissory notes,
including accrued interest, of $212,734, Charles P. Stevenson, Jr., Navigator
Fund, L.P. and Navigator Global Fund will receive an aggregate of 74,081 shares
of Series C Preferred Stock in exchange for the cancellation of promissory
notes, including accrued interest, of $388,926, Herb Karlitz will receive 12,260
shares of Series C Preferred Stock in exchange for the cancellation of
promissory notes, including accrued interest, of $64,364 and Robert Graifman
will receive 3,967 shares of Series C Preferred Stock in exchange for the
cancellation of promissory notes, including accrued interest, of $20,828. The
balance of the promissory notes in the principal amount of $250,000 will be
repaid from the proceeds of this offering, including indebtedness owed to Mr.
Horowitz and CMH in the aggregate amount of $56,235, Charles P. Stevenson, Jr.
in the amount of $23,018, Navigator Fund L.P. in the amount of $69,990,
Navigator Global Fund in the amount of $9,803, Herb Karlitz in the amount of
$17,014 and Robert Graifman in the amount of $5,503. In addition, in the event
the Underwriter exercises the over-allotment option in whole or in part, the
Company will use 50% of the net proceeds to repay a portion of the promissory
notes, pro-rata, among the holders of such promissory notes, including
Applewood, Messrs. Stevenson and Horowitz and their affiliated entities, Herb
Karlitz and Robert Graifman, and the number of shares of Series C Preferred
Stock will be proportionately reduced.
    
 
   
    Upon consummation of this offering, 333,334 shares of Series B Preferred
Stock owned by Pisces Investors, L.P. ("Pisces") and 100,000 shares of Series B
Preferred Stock owned by Security Partners, L.P. ("Security Partners") will
automatically convert into 206,933 shares and 62,080 shares of Common Stock,
respectively. CMH is the general partner of Pisces and Security Partners. Mr.
Horowitz and Herb Karlitz are limited partners of Security Partners. In
addition, Robert Graifman is a limited partner of Pisces and Security Partners.
    
 
    The Company believes that the aforementioned transactions with its officers,
directors and principal stockholders and their affiliates were on terms no less
favorable than could have been obtained from unaffiliated third parties.
However, the Company lacked sufficient disinterested independent directors at
the time of certain of such transactions. All future transactions, including
loans, between the Company and its officers, directors and stockholders
beneficially owning 5% or more of the Company's outstanding voting securities,
or affiliates of such persons, will be for bona fide business purposes and will
be on terms no less favorable to the Company than could be obtained in arm's
length transactions from unaffiliated third parties. Further, all such
transactions and loans and any forgiveness of indebtedness owed by such persons
to the Company must be approved by a majority of the Company's independent
directors who do not have an interest in the transactions and who have access,
at the Company's expense, to the Company's or independent legal counsel.
 
                                       59
<PAGE>
                           DESCRIPTION OF SECURITIES
 
   
    The authorized capital stock of the Company consists of 25,000,000 shares of
Common Stock, par value $.01 per share, and 5,000,000 shares of Preferred Stock,
par value $.01 per share. As of the date of this Prospectus (after giving effect
to the Pro Forma Adjustments and the Offering Adjustments), the Company has
outstanding 2,662,631 shares of Common Stock, held of record by 87 stockholders
and 562,836 shares of Series C Preferred Stock held of record by 14
stockholders. Upon consummation of this offering, there will be 4,362,631 shares
of Common Stock and 562,836 shares of Series C Preferred Stock outstanding.
    
 
COMMON STOCK
 
    Holders of Common Stock are entitled to one vote per share on all matters
submitted to a vote of stockholders. There are no cumulative voting rights for
the election of directors, which means that the holders of more than 50% of such
outstanding shares voting for the election of directors can elect all of the
directors of the Company standing for election. Subject to the rights of any
outstanding class or series of Preferred Stock created by the authority of the
Board of Directors, holders of Common Stock are entitled to received dividends
as and when declared by the Board of Directors out of funds legally available
therefor. Subject to the rights of any outstanding class or series of Preferred
Stock created by the authority of the Board of Directors, in the event of the
liquidation, dissolution or winding up of the Company, the holder of each share
of Common Stock is entitled to share equally in the balance of any of the
Company's assets available for distribution to stockholders. Outstanding shares
of Common Stock do not have subscription or conversion rights and there are no
redemption or sinking fund provisions applicable thereto. Holders of Common
Stock have no preemptive rights to purchase pro-rata portions of new issues of
Common Stock or Preferred Stock of the Company. The outstanding shares of Common
Stock are, and the shares of Common Stock offered by the Company hereby will be,
when issued and sold hereunder, fully paid and non-assessable.
 
PREFERRED STOCK
 
   
    Upon the consummation of this offering, all 500,000 shares of Series B
Preferred Stock outstanding will be converted into 310,399 shares of Common
Stock (See Note F(1) to Notes to Financial Statements for a description of the
Series B Convertible Preferred Stock) and the Company will issue 562,836 shares
of Series C Preferred Stock in exchange for the cancellation of promissory notes
in the principal amount and accrued interest of $2,954,888. See Note J[2] to
Notes to Financial Statements.
    
 
   
    The 562,836 shares of Series C Preferred Stock may be converted into an
equal number of shares of Common Stock at any time at the option of the holders,
subject to adjustment in the event of a merger or consolidation of the Company,
reclassification of the Company's securities or a stock split, subdivision or
combination of the Company's securities. The Series C Preferred Stock is
entitled to vote on all matters on which stockholders are entitled to vote,
together with the holders of Common Stock. Each share of Series C Preferred
Stock is entitled to the number of votes equal to the number of shares of Common
Stock into which such shares may be converted. Holders of the Series C Preferred
Stock will be entitled to equivalent dividends and distributions as those paid
on shares of Common Stock. The holders of the Series C Preferred Stock will be
entitled to a liquidation preference of $5.25 per share plus any declared but
unpaid dividends before any payments are made to holders of Common Stock, in the
event of liquidation, dissolution or winding up of the Company or, if elected by
a majority of the outstanding shares of Series C Preferred Stock, upon the sale
of all or substantially all of the assets of the Company or a merger of the
Company into any other entity.
    
 
    The Board is authorized, subject to any limitations prescribed by Delaware
law, to provide for the issuance of additional shares of Preferred Stock in one
or more series, to establish from time to time the number of shares to be
included in each such series, to fix the rights, preferences and privileges of
the shares of each wholly unissued series and any qualifications, limitations or
restrictions thereon, and to increase or decrease the number of shares of any
such series (but not below the number of shares of such series then
outstanding), without any further vote or action by the stockholders. The Board
may authorize the issuance of Preferred Stock with voting or conversion rights
that could adversely affect the voting power or other rights of the holders of
Common Stock. Thus, the issuance of Preferred Stock may have the
 
                                       60
<PAGE>
effect of delaying, deferring or preventing a change in control of the Company.
The Company has no current plan to issue any shares of Preferred Stock.
 
WARRANTS AND OPTIONS
 
   
    As of the date of this Prospectus, the Company has outstanding warrants to
purchase 336,007 shares of Common Stock (excluding the Underwriter's Warrants to
purchase 170,000 shares of Common Stock) and options to purchase 294,879 shares
of Common Stock (excluding options to purchase 855,216 shares of Common Stock
issued pursuant to the Stock Option Plan). All outstanding warrants are
currently exercisable and outstanding options are currently exercisable to
purchase 100,259 shares of Common Stock (excluding currently exercisable options
issued pursuant to the Stock Option Plan). The outstanding warrants are
exercisable at prices ranging from $1.61 to $9.66 and expire between February
2002 and May 2008. The outstanding options are exercisable at $2.42 per share
and expire May 2003.
    
 
    The warrants also entitle the holder to certain registration rights with
respect to the shares of Common Stock issuable upon exercise of such warrants.
No warrantholder has any stockholder rights with respect to the shares issuable
upon exercise of warrants held by such holder until such warrants are exercised
and the purchase price is paid for the shares. Each of the warrants and options
also provides, among other things, for the adjustment of the price per share and
number of shares issuable upon exercise of such warrants and options upon a
merger or consolidation of the Company, reclassification of the Company's
securities, a stock split, subdivision or combination of the Company's
securities, the payment of a dividend in Common Stock of the Company or of
certain other dividends or distributions with respect to the Common Stock of the
Company.
 
REGISTRATION RIGHTS OF CERTAIN HOLDERS
 
    The holders of 1,040,614 shares of Common Stock (including warrants
exercisable to purchase 62,856 shares of Common Stock) have been granted certain
demand registration rights, including the right to request on up to two
occasions that the Company file a registration statement with respect to such
shares under the Securities Act and use its best efforts to effect any such
registration. In addition, the holders of 1,462,757 shares of Common Stock
(including warrants exercisable to purchase 336,007 shares) are entitled to
piggyback registration rights with respect to such shares. If the Company
proposes to register any of its securities, either for its own account or for
the account of other stockholders, the Company is required to notify these
holders and, subject to certain conditions and limitations, to include in such
registration all of the shares of Common Stock requested to be included by such
holders. All holders of registration rights have agreed to waive such rights in
connection with this offering and not to exercise any such rights for one year
from the date of this Prospectus, without the Underwriter's prior written
consent.
 
    In connection with this offering, the Company has agreed to grant the
Underwriter certain demand and piggyback registration rights with respect to the
shares of Common Stock issuable upon exercise of the Underwriter's Warrants. See
"Underwriting."
 
DELAWARE ANTI-TAKEOVER LAW
 
    The Company is subject to the provisions of Section 203 of the Delaware
General Corporation Law (the "Anti-Takeover Law") regulating corporate
takeovers. The Anti-Takeover Law prevents certain Delaware corporations,
including those whose securities are listed on the Nasdaq SmallCap Market from
engaging, under certain circumstances, in a "business combination" (which
includes a merger or sale of more than 10% of the corporation's assets) with any
"interested stockholder" (a stockholder who owns 15% or more of the
corporation's outstanding voting stock) for three years following the date that
such stockholder became an "interested stockholder" unless the business
combination is approved in a prescribed manner. A Delaware corporation may "opt
out" of the Anti-Takeover Law with an express provision in its original or
amended certificate of incorporation or an express provision in its Bylaws
resulting from a stockholders' amendment approved by at least a majority of the
outstanding voting shares. The Company has not "opted out" of the provisions of
the Anti-Takeover Law.
 
TRANSFER AGENT
 
    The Transfer Agent for the Company's Common Stock is American Stock Transfer
and Trust Company, 40 Wall Street, New York, New York 10005.
 
                                       61
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE
 
   
    Upon the consummation of this offering, the Company will have 4,925,467
shares of Common Stock outstanding (assuming the conversion of outstanding
Series C Preferred Stock into 562,836 shares of Common Stock), of which the
1,700,000 shares being offered hereby will be freely tradeable without
restriction or further registration under the Securities Act, except for any
shares purchased by an "affiliate of the Company" (in general, a person who has
a controlling position with regard to the Company), which will be subject to the
resale limitations of Rule 144 promulgated under the Securities Act.
    
 
   
    All of the remaining 3,225,467 shares of Common Stock currently outstanding
or issuable upon conversion of outstanding shares of Series C Preferred Stock
are "restricted securities" or owned by "affiliates" (as those terms are defined
in Rule 144) and thus may not be sold publicly unless they are registered under
the Securities Act or are sold pursuant to Rule 144 or another exemption from
registration. Of the 3,225,467 restricted shares, an aggregate of 2,566,714
shares will be eligible for sale, without registration, under Rule 144 (subject
to certain volume limitations prescribed by such rule and to the contractual
restrictions described below), following the date of this Prospectus and the
balance of such shares will become eligible for sale at various times
thereafter. The holders of 3,141,976 shares have agreed not to sell or otherwise
dispose of any shares of Common Stock in the public markets and all holders of
registration rights have agreed not to exercise any such rights to cause the
Company to register any shares of Common Stock for sale pursuant to the
Securities Act, in each case, for a period of 12 months following the date of
this Prospectus, without the Underwriter's prior written consent.
    
 
   
    In general, under Rule 144 as currently in effect, beginning 90 days after
the date of this Prospectus, a person (or persons whose shares are aggregated)
who has beneficially owned restricted securities for at least one year
(including the holding period of any prior owner except an affiliate of the
Company) would be entitled to sell within any three-month period a number of
shares that does not exceed the greater of: (i) 1% of the number of shares of
Common Stock then outstanding (which will equal approximately 49,255 shares
immediately following the consummation of this offering); or (ii) the average
weekly trading volume of the Common Stock during the four calendar weeks
preceding the filing of a Form 144 with respect to such sale. Sales under Rule
144 are also subject to certain manner of sale provisions, notice requirements
and the availability of current public information about the Company. Under Rule
144(k), a person who is not deemed to have been an affiliate of the Company at
any time during the 90 days preceding a sale, and who has beneficially owned the
shares proposed to be sold for at least two years (including the holding period
of any prior owner except an affiliate of the Company), is entitled to sell such
shares without complying with the manner of sale, public information, volume
limitation or notice provisions of Rule 144. Unless otherwise restricted,
"144(k) shares" may therefore be sold immediately upon the consummation of this
offering.
    
 
    Rule 701 permits resales of shares in reliance upon Rule 144 but without
compliance with certain restrictions, including the holding period requirement,
of Rule 144. Any employee, officer or director of or consultant to the Company
who purchased his or her shares pursuant to a written compensatory plan or
contract may be entitled to rely on the resale provisions of Rule 701. Rule 701
permits affiliates to sell their Rule 701 shares under Rule 144 without
complying with the holding period requirements of Rule 144. Rule 701 further
provides that non-affiliates may sell such shares in reliance on Rule 144
without having to comply with the holding period, public information, volume
limitation or notice provisions of Rule 144. In both cases, a holder of Rule 701
shares is required to wait until 90 days after the date of this Prospectus
before selling such shares.
 
    Prior to this offering, there has been no market for the Common Stock and no
prediction can be made as to the effect, if any, that market sales of shares of
Common Stock or the availability of such shares for sale will have on the market
prices of the Common Stock prevailing from time to time. Nevertheless, the
possibility that substantial amounts of Common Stock may be sold in the public
market may adversely affect prevailing market prices for the Common Stock and
could impair the Company's ability to raise capital through the sale of its
equity securities.
 
                                       62
<PAGE>
                                  UNDERWRITING
 
   
    Whale Securities Co., L.P. (the "Underwriter") has agreed, subject to the
terms and conditions contained in the Underwriting Agreement, to purchase the
1,700,000 shares of Common Stock offered hereby from the Company. The
Underwriter is committed to purchase and pay for all of the shares of Common
Stock offered hereby if any of such securities are purchased. The shares of
Common Stock are being offered by the Underwriter, subject to prior sale, when,
as and if delivered to and accepted by the Underwriter and subject to certain
legal matters by counsel and to certain other conditions.
    
 
    The Underwriter has advised the Company that it proposes to offer the shares
of Common Stock to the public at the public offering price set forth on the
cover page of this Prospectus. The Underwriter may allow certain dealers who are
member of the National Association of Securities Dealers, Inc. (the "NASD")
concessions, not in excess of $   per share, of which not in excess of $   per
share may be reallowed to other dealers who are members of the NASD.
 
   
    The Company has granted to Underwriter an option, exercisable for 45 days
following the date of this Prospectus, to purchase up to 255,000 shares at the
public offering price set forth on the cover page of this Prospectus, less
underwriting discounts and commissions. The Underwriter may exercise this option
in whole or, from time to time, in part, solely for the purpose of covering
over-allotments, if any, made in connection with the sale of the shares offered
hereby.
    
 
    The Company has agreed to pay to the Underwriter a non-accountable expense
allowance equal to 3% of the gross proceeds derived from the sale of the shares
offered hereby, including any securities sold prior to the Underwriter's
over-allotment option, $50,000 of which has been paid as of the date of this
Prospectus. The Company has also agreed to pay all expenses in connection with
qualifying the shares offered under the laws of such states as the Underwriter
may designate, including expenses of counsel retained for such purpose by the
Underwriter.
 
   
    The Company has agreed to sell to the Underwriter and its designees, for an
aggregate of $100, warrants (the "Underwriter's Warrants") to purchase up to
170,000 shares of Common stock at an exercise price of $9.30 per share (155% of
the public offering price per share). The Underwriter's Warrants may not be
assigned or hypothecated for one year following the date of this Prospectus,
except to the officers and partners of the Underwriter and members of the
selling group, and are exercisable at any time, in whole or in part, during the
four-year period commencing one year from the date of this Prospectus (the
"Warrant Exercise Term"). During the Warrant Exercise Term, the holders of the
Underwriter's Warrants are given, at nominal cost, the opportunity to profit
from a rise in the market price of the Common Stock. To the extent that the
Warrants are exercised, dilution to the interests of the Company's stockholders
will occur. Further, the terms upon which the Company will be able to obtain
additional equity capital may be adversely affected, since the holders of the
Underwriter's Warrants can be expected to exercise them at a time when the
Company would, in all likelihood, be able to obtain any needed capital on terms
more favorable to the Company than in the Underwriter's Warrants. Any profit
realized by the Underwriter on the sale of the Underwriter's Warrants, the
underlying shares of Common Stock or the underlying warrants may be deemed
additional underwriting compensation. The Underwriter's Warrants contain a
cashless exercise provision. Subject to certain limitations and exclusions, the
Company has agreed that, upon the request of the holders of the majority of the
Underwriter's Warrants, the Company will (at its own expense), on one occasion
during the Warrant Exercise term, register the Underwriter's Warrants and the
securities underlying the Underwriter's Warrants under the Securities Act and
that it will include the Underwriter's Warrants and all such underlying
securities in any appropriate registration statement which is filed by the
Company under the Securities Act during the seven years following the date of
this Prospectus.
    
 
    The Company has agreed, for a period of five years from the date of this
Prospectus, if so requested by the Underwriter, to recommend and use its best
efforts to elect a designee of the Underwriter as a director of the Company. The
Company's officers, directors and principal stockholders have agreed to vote
their
 
                                       63
<PAGE>
shares of Common Stock in favor of such designee. The Underwriter has not yet
exercised and currently does not intend to exercise its right to designate such
a person.
 
   
    All of the Company's officers, directors and securityholders owning an
aggregate of 3,141,976 shares of Common Stock have agreed not to sell or
otherwise dispose any of their securities in the public markets for a period of
twelve months from the date of this Prospectus without the Underwriter's prior
written consent.
    
 
    The Underwriter has informed the Company that it does not expect sales of
the securities offered discretionary accounts to exceed 1% of the shares offered
hereby.
 
    The Company has agreed to indemnify the Underwriter against certain civil
liabilities, including liabilities under the Securities Act.
 
    Prior to this offering there has been no public market for the Common Stock.
Accordingly, the initial public offering price of the Common Stock will be
determined by negotiation between the Company and the Underwriter and may not
necessarily be related to the Company's asset value, net worth or other
established criteria of value. Factors to be considered in determining such
price include the Company's financial condition and prospects, an assessment of
the Company's management, market prices of similar securities of comparable
publicly-traded companies, certain financial and operating information of
companies engaged in activities similar to those of the Company and the general
condition of the securities market.
 
   
    In order to facilitate the offering, the Underwriter may engage in
transactions that stabilize, maintain, or otherwise affect the price of the
Common Stock. Specifically, the Underwriter may over-allot in connection with
the offering, creating a short position in the Common Stock for its own account.
In addition, to cover over-allotments or to stabilize the price of the Common
Stock, the Underwriter may bid for, and purchase, shares of Common Stock in the
open market. The Underwriter may also reclaim selling concessions allowed to a
dealer for distributing the Common Stock in the offering, if the Underwriter
repurchases previously distributed Common Stock in transactions to cover short
positions, in stabilization transactions or otherwise. Any of these activities
may stabilize or maintain the market price of the Common Stock above independent
market levels. The Underwriter is not required to engage in these activities,
and may end any of these activities at any time.
    
 
                                 LEGAL MATTERS
 
    The validity of the Common Stock offered hereby will be passed upon for the
Company by Bizar Martin & Taub, LLP. Certain legal matters in connection with
this offering will be passed upon for the Underwriter by Tenzer Greenblatt LLP.
Bizar Martin & Taub, LLP owns currently exercisable warrants to purchase 9,312
shares of the Company's Common Stock at an exercise price of $6.44 per share.
 
                                    EXPERTS
 
    The financial statements of the Company as of December 31, 1997 and 1996 and
for each of the years then ended appearing in this Prospectus and Registration
Statement have been audited by Richard A. Eisner & Company, LLP, independent
auditors, as set forth in their report thereon (which contains an explanatory
paragraph with respect to the Company's ability to continue as a going concern)
appearing elsewhere herein, and are included in reliance upon such report given
upon the authority of said firm as experts in accounting and auditing.
 
                                       64
<PAGE>
                             ADDITIONAL INFORMATION
 
    The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form SB-2 under the Securities Act
with respect to the Common Stock offered hereby. This Prospectus, which
constitutes a part of the Registration Statement, does not contain all of the
information set forth in the Registration Statement and the exhibits and
schedules thereto. For further information with respect to the Company and the
Common Stock offered hereby, reference is hereby made to the Registration
Statement and the exhibits and schedules filed as a part thereof. Statements
contained in this Prospectus as to the contents of any contract or any other
document referred to are not necessarily complete. In each instance, reference
is made to the copy of such contract or document filed as an exhibit to the
Registration Statement, and each such statement is qualified in all respects by
such reference. The Registration Statement, including exhibits and schedules
thereto, may be inspected and copied at the principal office of the Commission
at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549 and at the
Commission's regional offices located at Seven World Trade Center, Suite 1300,
New York, New York 10048 and Citicorp Center, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661. Copies of such materials may also be obtained at
prescribed rates from the Public Reference Section of the Commission, at 450
Fifth Street, N.W., Washington, D.C. 20549. In addition, registration statements
and certain other filings made with the Commission through its Electronic Data
Gathering, Analysis and Retrieval ("EDGAR") systems are publicly available
through the Commission's site on the Internet's World Wide Web, located at
http://www.sec.gov. The Registration Statement, including all exhibits thereto
and amendments thereof, has been filed with the Commission through EDGAR.
 
    Upon consummation of this offering, the Company will become subject to the
reporting requirements of the Securities Exchange Act of 1934 and in accordance
therewith will file reports, proxy statements and other information with the
Commission. The Company intends to furnish its stockholders with annual reports
containing audited financial statements and such other reports as the Company
deems appropriate or as may be required by law.
 
                                       65
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
INDEX TO FINANCIAL STATEMENTS
  Independent auditors' report.............................................................................         F-2
  Balance sheets as of December 31, 1996 and 1997 and June 30, 1998 (unaudited)............................         F-3
  Statements of operations for the years ended December 31, 1996 and 1997 and for the six months ended June
    30, 1997 and 1998 (unaudited)..........................................................................         F-4
  Statements of stockholders' equity (deficiency) for the years ended December 31, 1996 and 1997 and for
    the six months ended June 30, 1998 (unaudited).........................................................         F-5
  Statements of cash flows for the years ended December 31, 1996 and 1997 and for the six months ended June
    30, 1997 and 1998 (unaudited)..........................................................................         F-6
  Notes to financial statements............................................................................         F-7
</TABLE>
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
Board of Directors and Stockholders
Network-1 Security Solutions, Inc.
Wellesley, Massachusetts
 
    We have audited the accompanying balance sheets of Network-1 Security
Solutions, Inc. (the "Company") as of December 31, 1996 and 1997 and the related
statements of operations, stockholders' equity (deficiency) and cash flows for
each of the years then ended. These financial statements are the responsibility
of the Company's management. Our responsibility is to express an opinion on
these financial statements based on our audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, the financial statements enumerated above present fairly, in
all material respects, the financial position of Network-1 Security Solutions,
Inc. as of December 31, 1996 and 1997 and the results of its operations and its
cash flows for each of the years then ended in conformity with generally
accepted accounting principles.
 
    The accompanying financial statements have been prepared assuming that the
Company will continue as a going concern. As discussed in Note A to the
financial statements, the Company has incurred substantial losses from
operations, and as of December 31, 1997 has a working capital deficiency of
$661,000 and a stockholders' deficiency of $75,000. These factors raise
substantial doubt about the Company's ability to continue as a going concern.
Management's plans in regard to these matters are also described in Note A. The
financial statements do not include any adjustments that might result from the
outcome of this uncertainty.
 
Richard A. Eisner & Company, LLP
 
New York, New York
June 17, 1998
 
With respect to Note F[3]
July 8, 1998
 
With respect to the third paragraph of Note A
July 17, 1998
 
   
With respect to Note J
October 20, 1998
    
 
                                      F-2
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
                                 BALANCE SHEETS
 
   
<TABLE>
<CAPTION>
                                                                                 DECEMBER 31,
                                                                          --------------------------    JUNE 30,
                                                                              1996          1997          1998
                                                                          ------------  ------------  ------------
<S>                                                                       <C>           <C>           <C>
                                                                                                      (UNAUDITED)
ASSETS
Current assets:
  Cash and cash equivalents.............................................  $    217,000  $     60,000  $    634,000
  Accounts receivable--net of allowance for doubtful accounts of $5,000,
    $70,000 and $88,000, respectively...................................       191,000       435,000       609,000
  Prepaid expenses and other current assets.............................        30,000        30,000        35,000
                                                                          ------------  ------------  ------------
        Total current assets............................................       438,000       525,000     1,278,000
  Equipment and fixtures................................................       518,000       400,000       323,000
  Capitalized software costs--net.......................................       729,000     1,258,000     1,042,000
  Security deposits.....................................................       193,000       131,000       136,000
  Deferred offering costs...............................................                      90,000       350,000
                                                                          ------------  ------------  ------------
                                                                          $  1,878,000  $  2,404,000  $  3,129,000
                                                                          ------------  ------------  ------------
                                                                          ------------  ------------  ------------
LIABILITIES
Current liabilities:
  Accounts payable......................................................  $    275,000  $    776,000  $    598,000
  Accrued fee--related party............................................                     138,000
  Accrued expenses and other current liabilities........................       155,000       201,000       302,000
  Notes payable--related parties, net of discount.......................                                 1,610,000
  Notes payable--others, net of discount................................                                   972,000
  Interest payable--related parties.....................................                                    72,000
  Interest payable--other...............................................                                    61,000
  Current portion of capital lease obligations..........................        24,000         8,000
  Deferred revenue......................................................        25,000        63,000        92,000
                                                                          ------------  ------------  ------------
        Total current liabilities.......................................       479,000     1,186,000     3,707,000
Capital lease obligations--less current portion.........................         8,000
Notes payable--related parties, net of discount.........................                     564,000
Notes payable--others, net of discount..................................                     670,000
Interest payable--related parties.......................................                      24,000
Interest payable--others................................................                      35,000
                                                                          ------------  ------------  ------------
                                                                               487,000     2,479,000     3,707,000
                                                                          ------------  ------------  ------------
Commitments and contingencies
STOCKHOLDERS' EQUITY (DEFICIENCY)
Preferred stock--$.01 par value; authorized 5,000,000 shares; Series
  A--10% cumulative, 250,000 shares authorized, none issued and
  outstanding
  Series B--500,000 shares authorized, issued and outstanding
  (liquidation preference $500,000).....................................         5,000         5,000         5,000
  Series C--750,000 shares authorized, none issued and outstanding
Common stock--$.01 par value; authorized 25,000,000 shares; 2,004,951,
  1,706,037 and 1,678,104 shares issued and outstanding.................        20,000        17,000        17,000
Additional paid-in capital..............................................     6,446,000     7,373,000     9,432,000
Accumulated deficit.....................................................    (5,080,000)   (7,470,000)   (9,460,000)
Unearned portion of compensatory stock options..........................                                  (572,000)
                                                                          ------------  ------------  ------------
                                                                             1,391,000       (75,000)     (578,000)
                                                                          ------------  ------------  ------------
                                                                          $  1,878,000  $  2,404,000  $  3,129,000
                                                                          ------------  ------------  ------------
                                                                          ------------  ------------  ------------
</TABLE>
    
 
                       See notes to financial statements
 
                                      F-3
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                   YEAR ENDED           SIX MONTHS ENDED
                                                  DECEMBER 31,              JUNE 30,
                                             ----------------------  ----------------------
                                                1996        1997        1997        1998
                                             ----------  ----------  ----------  ----------
                                                                          (UNAUDITED)
<S>                                          <C>         <C>         <C>         <C>
Revenues:
  Licenses.................................  $  624,000  $1,132,000  $  506,000  $  412,000
  Royalties................................                 500,000     500,000
  Services.................................     403,000     737,000     421,000     490,000
                                             ----------  ----------  ----------  ----------
    Total revenues.........................   1,027,000   2,369,000   1,427,000     902,000
                                             ----------  ----------  ----------  ----------
 
Cost of revenues:
  Amortization of software development
    costs..................................     246,000     321,000     125,000     267,000
  Cost of licenses.........................     193,000     176,000      52,000     128,000
  Cost of services.........................     390,000     418,000     212,000     272,000
                                             ----------  ----------  ----------  ----------
    Total cost of revenues.................     829,000     915,000     389,000     667,000
                                             ----------  ----------  ----------  ----------
Gross profit...............................     198,000   1,454,000   1,038,000     235,000
                                             ----------  ----------  ----------  ----------
 
Operating expenses:
  Product development......................     892,000     792,000     235,000     283,000
  Selling and marketing....................   1,614,000     926,000     524,000     351,000
  General and administrative...............   1,931,000   1,573,000     919,000   1,153,000
                                             ----------  ----------  ----------  ----------
    Total operating expenses...............   4,437,000   3,291,000   1,678,000   1,787,000
                                             ----------  ----------  ----------  ----------
Loss from operations.......................  (4,239,000) (1,837,000)   (640,000) (1,552,000)
Interest expense, including amortization of
  debt discount............................    (260,000)   (553,000)   (141,000)   (438,000)
                                             ----------  ----------  ----------  ----------
Net loss...................................  $(4,499,000) $(2,390,000) $ (781,000) $(1,990,000)
                                             ----------  ----------  ----------  ----------
                                             ----------  ----------  ----------  ----------
 
Loss per share--basic and diluted..........  $    (2.46) $    (1.29) $     (.40) $    (1.17)
                                             ----------  ----------  ----------  ----------
                                             ----------  ----------  ----------  ----------
 
Weighted average number of shares
  outstanding--basic and diluted...........   1,825,163   1,855,244   1,934,334   1,699,120
                                             ----------  ----------  ----------  ----------
                                             ----------  ----------  ----------  ----------
</TABLE>
 
                       See notes to financial statements
 
                                      F-4
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIENCY)
<TABLE>
<CAPTION>
                                                      COMMON STOCK         PREFERRED STOCK     ADDITIONAL
                                                  ---------------------  --------------------    PAID-IN    ACCUMULATED
                                                    SHARES     AMOUNT     SHARES     AMOUNT      CAPITAL      DEFICIT
                                                  ----------  ---------  ---------  ---------  -----------  ------------
<S>                                               <C>         <C>        <C>        <C>        <C>          <C>
BALANCE--DECEMBER 31, 1995......................   1,164,133  $  12,000    750,000  $   7,000  $ 1,146,000   $ (581,000)
Issuance of common stock for cash--net..........     698,397      7,000                          4,141,000
Issuance of common stock and warrants for
  services rendered.............................      18,262                                       683,000
Conversion of notes payable into common stock...     108,639      1,000                            699,000
Redemption of preferred stock...................                          (250,000)    (2,000)    (248,000)
Exercise of warrants............................      15,520                                        25,000
Net loss........................................                                                             (4,499,000)
                                                  ----------  ---------  ---------  ---------  -----------  ------------
BALANCE--DECEMBER 31, 1996......................   2,004,951     20,000    500,000      5,000    6,446,000   (5,080,000)
Issuance of common stock and warrants for
  services rendered.............................       2,794                                       163,000
Warrants issued in connection with debt
  financing.....................................                                                   766,000
Repurchase and retirement of common shares......    (301,708)    (3,000)                            (2,000)
Net loss........................................                                                             (2,390,000)
                                                  ----------  ---------  ---------  ---------  -----------  ------------
BALANCE--DECEMBER 31, 1997......................   1,706,037     17,000    500,000      5,000    7,373,000   (7,470,000)
Common stock options issued to Chief Executive
  Officer.......................................                                                   938,000
Amortization of compensatory stock options......
Issuance of common stock, warrants and options
  for services rendered and payment of
  liability.....................................      34,147                                       356,000
Warrants issued in connection with debt
  financing.....................................                                                   766,000
Repurchase and retirement of common shares......     (62,080)                                       (1,000)
Net loss........................................                                                             (1,990,000)
                                                  ----------  ---------  ---------  ---------  -----------  ------------
BALANCE--JUNE 30, 1998 (UNAUDITED)..............   1,678,104  $  17,000    500,000  $   5,000  $ 9,432,000   $(9,460,000)
                                                  ----------  ---------  ---------  ---------  -----------  ------------
                                                  ----------  ---------  ---------  ---------  -----------  ------------
 
<CAPTION>
                                                    UNEARNED
                                                   PORTION OF
                                                  COMPENSATORY
                                                  STOCK OPTIONS     TOTAL
                                                  -------------  -----------
<S>                                               <C>            <C>
BALANCE--DECEMBER 31, 1995......................                 $   584,000
Issuance of common stock for cash--net..........                   4,148,000
Issuance of common stock and warrants for
  services rendered.............................                     683,000
Conversion of notes payable into common stock...                     700,000
Redemption of preferred stock...................                    (250,000)
Exercise of warrants............................                      25,000
Net loss........................................                  (4,499,000)
                                                  -------------  -----------
BALANCE--DECEMBER 31, 1996......................                   1,391,000
Issuance of common stock and warrants for
  services rendered.............................                     163,000
Warrants issued in connection with debt
  financing.....................................                     766,000
Repurchase and retirement of common shares......                      (5,000)
Net loss........................................                  (2,390,000)
                                                  -------------  -----------
BALANCE--DECEMBER 31, 1997......................                     (75,000)
Common stock options issued to Chief Executive
  Officer.......................................   $  (938,000)
Amortization of compensatory stock options......       366,000       366,000
Issuance of common stock, warrants and options
  for services rendered and payment of
  liability.....................................                     356,000
Warrants issued in connection with debt
  financing.....................................                     766,000
Repurchase and retirement of common shares......                      (1,000)
Net loss........................................                  (1,990,000)
                                                  -------------  -----------
BALANCE--JUNE 30, 1998 (UNAUDITED)..............   $  (572,000)  $  (578,000)
                                                  -------------  -----------
                                                  -------------  -----------
</TABLE>
 
                       See notes to financial statements
 
                                      F-5
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                            STATEMENTS OF CASH FLOWS
<TABLE>
<CAPTION>
                                                                                            SIX MONTHS ENDED
                                                                   DECEMBER 31,                 JUNE 30,
                                                            --------------------------  ------------------------
<S>                                                         <C>           <C>           <C>         <C>
                                                                1996          1997         1997         1998
                                                            ------------  ------------  ----------  ------------
 
<CAPTION>
                                                                                              (UNAUDITED)
<S>                                                         <C>           <C>           <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss................................................  $ (4,499,000) $ (2,390,000) $ (781,000) $ (1,990,000)
  Adjustments to reconcile net loss to net cash used in
    operating activities:
    Amortization of debt discount.........................       306,000       500,000     128,000       364,000
    Issuance of common stock and warrants for services
      rendered............................................       683,000       163,000      95,000       583,000
    Provision for doubtful accounts.......................       (15,000)       65,000      36,000        18,000
    Depreciation and amortization.........................       368,000       481,000     200,000       346,000
    Changes in:
      Accounts receivable.................................       131,000      (309,000)   (330,000)     (192,000)
      Prepaid expenses and other current assets...........       (15,000)                                 (5,000)
      Accounts payable, accrued expenses and other current
        liabilities.......................................       196,000       744,000     147,000        (1,000)
      Deferred revenue....................................        25,000        38,000      (3,000)       29,000
                                                            ------------  ------------  ----------  ------------
        Net cash used in operating activities.............    (2,820,000)     (708,000)   (508,000)     (848,000)
                                                            ------------  ------------  ----------  ------------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Acquisitions of equipment and fixtures..................      (235,000)      (42,000)    (32,000)       (3,000)
  Capitalized software costs..............................      (750,000)     (850,000)   (506,000)      (50,000)
  Security deposit........................................      (164,000)       62,000      64,000        (5,000)
                                                            ------------  ------------  ----------  ------------
        Net cash used in investing activities.............    (1,149,000)     (830,000)   (474,000)      (58,000)
                                                            ------------  ------------  ----------  ------------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from issuance of notes payable and warrants....       700,000     1,550,000   1,000,000     1,750,000
  Repayment of notes payable..............................      (400,000)      (50,000)
  Proceeds from exercise of options and warrants..........        25,000
  Net proceeds from sale of common stock..................     4,148,000
  Repayment of capital lease obligations..................       (23,000)      (24,000)                   (8,000)
  Purchase of treasury shares.............................                      (5,000)     (1,000)       (1,000)
  Repayment of line of credit.............................       (62,000)
  Repayment of stockholder's loan.........................       (48,000)
  Redemption of preferred stock...........................      (250,000)
  Deferred offering costs.................................                     (90,000)    (25,000)     (261,000)
                                                            ------------  ------------  ----------  ------------
        Net cash provided by financing activities.........     4,090,000     1,381,000     974,000     1,480,000
                                                            ------------  ------------  ----------  ------------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS......       121,000      (157,000)     (8,000)      574,000
Cash and cash equivalents--beginning of period............        96,000       217,000     217,000        60,000
                                                            ------------  ------------  ----------  ------------
CASH AND CASH EQUIVALENTS--END OF PERIOD..................  $    217,000  $     60,000  $  209,000  $    634,000
                                                            ------------  ------------  ----------  ------------
                                                            ------------  ------------  ----------  ------------
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
  Cash paid during the period for:
    Interest..............................................  $     32,000  $      1,000
  Noncash transaction:
    Issuance of stock in connection with repayment of
      debt................................................  $    700,000
</TABLE>
 
                       See notes to financial statements
 
                                      F-6
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE A--THE COMPANY AND BASIS OF PRESENTATION
 
    Network-1 Security Solutions, Inc. (the "Company"), formerly known as
Network-1 Software & Technology, Inc., develops, markets, licenses and supports
its proprietary network security software products designed to provide
comprehensive security to computer networks. The Company also provides
maintenance and network consulting and training services.
 
    The accompanying financial statements have been prepared on a going concern
basis. As reflected in the accompanying financial statements, the Company has
incurred substantial losses from operations and as of December 31, 1997 has a
working capital deficiency of $661,000 and a stockholders' deficiency of
$75,000. Subsequent to December 31, 1997 through May 14, 1998, the Company
received $1,750,000 in short-term debt financing, a significant portion of which
was from principal stockholders of the Company. However, the Company will
require additional financing to satisfy its obligations and fund its operations
through December 31, 1998. Also, in May 1998, the Company signed a letter of
intent with an underwriter for the sale of its securities in an initial public
offering (the "Offering"). There is no assurance, however, that the Offering
will be consummated or that the Company will be able to obtain alternative
financing. As of June 30, 1998, the Company's working capital deficiency
increased to $2,429,000 and its stockholders' deficiency increased to $578,000.
The above factors give rise to substantial doubt as to the ability of the
Company to continue as a going concern. The financial statements do not include
any adjustments that might result from the outcome of this uncertainty.
 
    On July 17, 1998, the stockholders approved a 1:1.610831 reverse split of
the outstanding shares of the Company's common stock. The accompanying financial
statements have been retroactively adjusted to reflect the split and all
references to numbers of common shares, options, warrants and per share amounts
have been restated to give effect to the split.
 
NOTE B--SIGNIFICANT ACCOUNTING POLICIES
 
[1] CASH EQUIVALENTS:
 
   The Company considers all highly liquid short-term investments purchased with
    a maturity of three months or less to be cash equivalents.
 
[2] REVENUE RECOGNITION:
 
   In October 1997, the AICPA issued Statement of Position ("SOP") No. 97-2,
    "Software Revenue Recognition," which the Company adopted, effective January
    1, 1997. Such adoption had no effect on the Company's methods of recognizing
    revenue from its license and service activities. Prior to 1997, the
    Company's revenue recognition policy was in accordance with SOP No. 91-1,
    "Software Revenue Recognition."
 
   License revenue is recognized upon delivery of software or delivery of a
    required software key. Service revenues consist of maintenance, consulting
    and training services. Annual renewable maintenance fees are a separate
    component of each contract, and are recognized ratably over the contract
    term. Consulting and training revenues are recognized as such services are
    performed.
 
                                      F-7
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE B--SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
[3] EQUIPMENT AND FIXTURES:
 
   Equipment and fixtures are stated at cost and are depreciated using the
    straight-line method over their estimated useful lives of five years.
 
[4] SOFTWARE DEVELOPMENT COSTS:
 
   Costs to maintain developed programs and development costs incurred to
    establish the technological feasibility of computer software are expensed as
    incurred. The Company capitalizes costs incurred in producing computer
    software after technological feasibility of the software has been
    established. Such costs are amortized based on current and estimated future
    revenue of each product with an annual minimum equal to the straight-line
    amortization over the remaining estimated economic life of the product. The
    Company estimates the economic life of its software to be three years. At
    each balance sheet date, the unamortized capitalized software costs of each
    product are compared with the net realizable value of that product and any
    excess capitalized costs are written off.
 
[5] INCOME TAXES:
 
   The Company utilizes the liability method of accounting for income taxes.
    Under such method, deferred tax assets and liabilities are recognized for
    the future tax consequences attributable to differences between the
    financial statement carrying amounts of existing assets and liabilities and
    their respective tax bases. Deferred tax assets and liabilities are measured
    using enacted tax rates in effect at the balance sheet date. The resulting
    asset or liability is adjusted to reflect enacted changes in tax law.
 
[6] LOSS PER SHARE:
 
   During 1997, the Company adopted Statement of Financial Accounting Standards
    No. 128, "Earnings Per Share" ("SFAS No. 128"). SFAS No. 128 requires the
    reporting of basic and diluted earnings/loss per share. Basic loss per share
    is calculated by dividing net loss by the weighted average number of
    outstanding common shares during the year. Diluted per share data includes
    the dilutive effects of options, warrants and convertible securities. As all
    potential common shares are anti-dilutive, they are not included in the
    calculation of diluted loss per share. Loss per share for 1996 has been
    presented to conform to SFAS No. 128.
 
[7] USE OF ESTIMATES:
 
   The preparation of financial statements in conformity with generally accepted
    accounting principles requires management to make estimates and assumptions
    that affect the reported amounts of assets and liabilities and disclosure of
    contingent assets and liabilities at the date of the financial statements
    and the reported amounts of revenues and expenses during the reporting
    period. Actual results could differ from those estimates.
 
[8] FINANCIAL INSTRUMENTS:
 
   The carrying amounts of accounts receivable, accounts payable, accrued
    expenses, capitalized lease obligations and notes payable approximate their
    fair value as the interest rates on the Company's
 
                                      F-8
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE B--SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    indebtedness approximate current market rates and due to the short period to
    maturity of these instruments.
 
[9] STOCK-BASED COMPENSATION:
 
   In October 1995, the Financial Accounting Standards Board issued Statement of
    Financial Accounting Standards No. 123 ("SFAS No. 123"), "Accounting for
    Stock-Based Compensation". SFAS No. 123 encourages, but does not require,
    companies to record compensation cost for stock-based employee compensation
    plans at fair value. The Company has elected to continue to account for its
    employee stock-based compensation plans using the intrinsic value method
    prescribed by Accounting Principles Board Opinion No. 25 ("APB No. 25"),
    Accounting for Stock Issued to Employees" and to disclose the pro forma
    effect on net loss per share had the fair value of options been expensed.
    Under the provisions of APB No. 25, compensation cost for stock options is
    measured as the excess, if any, of the estimated market value of the
    Company's common stock at the date of the grant over the amount an employee
    must pay to acquire the stock.
 
[10] INTERIM FINANCIAL STATEMENTS:
 
   The accompanying balance sheet as of June 30, 1998, the statement of changes
    in stockholders' equity for the six-month period then ended and the
    statements of operations and cash flows for the six-month periods ended June
    30, 1997 and 1998 are unaudited. In the opinion of management, all
    adjustments (consisting only of normal recurring accruals) considered
    necessary for a fair presentation have been included. The results of
    operations for the six-month period ended June 30, 1998 are not necessarily
    indicative of the results to be expected for the year ended December 31,
    1998.
 
NOTE C--EQUIPMENT AND FIXTURES
 
    Equipment and fixtures are summarized as follows:
 
   
<TABLE>
<CAPTION>
                                                 DECEMBER 31,
                                             --------------------   JUNE 30,
                                               1996       1997        1998
                                             ---------  ---------  -----------
<S>                                          <C>        <C>        <C>
Office and computer equipment..............  $ 669,000  $ 661,000   $ 664,000
Furniture and fixtures.....................     59,000     59,000      59,000
Leasehold improvements.....................     46,000     46,000      46,000
                                             ---------  ---------  -----------
                                               774,000    766,000     769,000
Less accumulated depreciation..............   (256,000)  (366,000)   (446,000)
                                             ---------  ---------  -----------
                                             $ 518,000  $ 400,000   $ 323,000
                                             ---------  ---------  -----------
                                             ---------  ---------  -----------
</TABLE>
    
 
                                      F-9
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE D--CAPITALIZED SOFTWARE COSTS
 
   
<TABLE>
<CAPTION>
                                                                                                          SIX
                                                                                  YEAR ENDED             MONTHS
                                                                                 DECEMBER 31,            ENDED
                                                                           -------------------------    JUNE 30,
                                                                              1996          1997          1998
                                                                           -----------  ------------  ------------
<S>                                                                        <C>          <C>           <C>
Balance, beginning of period (net of accumulated amortization)...........  $   225,000  $    729,000  $  1,258,000
Additions................................................................      750,000       850,000        50,000
Amortization.............................................................     (246,000)     (321,000)     (266,000)
                                                                           -----------  ------------  ------------
Balance, end of period (net of accumulated amortization).................  $   729,000  $  1,258,000  $  1,042,000
                                                                           -----------  ------------  ------------
                                                                           -----------  ------------  ------------
</TABLE>
    
 
NOTE E--NOTES PAYABLE
 
    Notes payable is summarized as follows:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,    JUNE 30,
                                                                       1997          1998
                                                                   ------------  ------------
<S>                                                                <C>           <C>
Notes payable on the earlier of a) January 1, 1999 b) the date
  upon which the Company receives $6,000,000 net proceeds of
  equity or debt financing from one or a series of transactions
  c) a sale of all of the Company's assets or d) a merger or
  consolidation of the Company:
    Notes bearing interest at 6%, including $250,000 payable to a
      related party (1)..........................................   $  650,000   $    650,000
    Notes bearing interest at 6% (2).............................      350,000        350,000
    Note bearing interest at 8%, payable to a related party
      (3)........................................................      100,000        100,000
    Notes bearing interest at 8%, payable to related parties
      (4)........................................................      400,000        400,000
Notes payable (including $1,400,000 to related parties) on the
  earlier of a) twelve months from issuance b) the date upon
  which the Company receives $6,000,000 net proceeds of equity or
  debt financing from one or a series of transactions c) a sale
  of all of the Company's assets or d) a merger or consolidation
  of the Company; bearing interest at 8% (5).....................                   1,750,000
                                                                   ------------  ------------
                                                                     1,500,000      3,250,000
Less unamortized debt discount...................................     (266,000)      (668,000)
                                                                   ------------  ------------
                                                                    $1,234,000   $  2,582,000
                                                                   ------------  ------------
                                                                   ------------  ------------
</TABLE>
 
                                      F-10
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE E--NOTES PAYABLE (CONTINUED)
- ------------------------
 
(1) In connection with the issuance of the notes, including $250,000 issued to
    an entity which is a principal stockholder of the Company, the Company
    issued ten-year warrants valued at $290,000 to purchase 90,791 shares of the
    Company's common stock at an exercise price of $6.44 per share, increasing
    the effective interest rate on the notes to 91%.
 
(2) In connection with the issuance of the notes, the Company issued ten-year
    warrants valued at $159,000 to purchase 48,888 shares of the Company's
    common stock at an exercise price of $6.44 per share, increasing the
    effective interest rate to 94%.
 
(3) In connection with the issuance of the note to a corporation wholly owned by
    the Chairman of the Board and a principal stockholder of the Company, the
    Company agreed to reduce the exercise price of previously issued warrants to
    the noteholder from $6.44 per share (31,040 shares) and $8.05 per share
    (31,040 shares) to $3.22 per share (see Note G[5]). In addition, the Company
    agreed to reduce the exercise price of warrants to purchase 124,159 shares
    of common stock at an exercise price of $3.22 per share previously issued to
    the noteholder to $1.61 per share. The Company valued the modified warrants
    at $45,000 in excess of the value ascribed to the original warrants,
    increasing the effective interest rate to 96%. The warrants exercisable at
    $3.22 per share were further reduced to $1.61 per share in connection with
    the issuance in November 1997 of a note for $50,000 to the same corporation
    referred to above which was repaid in December 1997. This modification was
    valued at $22,000 in excess of the value ascribed to the warrants as
    previously modified.
 
(4) In connection with the issuance of the notes to an entity which is a
    principal stockholder of the Company and to the corporation referred to in
    (3) above, the Company issued ten-year warrants valued at $168,000 to
    purchase 70,949 shares of the Company's common stock at an exercise price of
    $4.83 per share, increasing the effective interest rate to 86%.
 
(5) The Company issued notes for $400,000, $100,000 and $1,250,000 on March 2,
    1998, April 24, 1998 and May 14, 1998, respectively. In connection with the
    issuance of the notes, $1,400,000 of which are payable to the Chairman of
    the Board and the entities referred to in (4) above, the Company issued
    ten-year warrants valued at $766,000 to purchase 325,919 shares of the
    Company's common stock at an exercise price of $4.83 per share, increasing
    the effective interest rate to 92%.
 
    The proceeds from the issuance of the notes were allocated to the debt and
the warrants based on their estimated fair values. The Company estimated the
fair value of these warrants using the Black-Scholes pricing model and has
accounted for this amount as a debt discount to be amortized over the life of
the debt.
 
    Interest expense for the years ended December 31, 1996, 1997 and for the six
months ended June 30, 1997 and 1998 includes $325,000, $267,000, $44,000 and
$323,000, respectively, of interest and amortization of debt discount on notes
to related parties.
 
                                      F-11
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE F--STOCKHOLDERS' EQUITY
 
[1] PREFERRED STOCK:
 
   
   The Company has outstanding 500,000 shares of Series B convertible preferred
    stock. Such stock is convertible on a 1.610831-to-1 basis into common shares
    and automatically converts into common shares upon the completion of the
    Offering. The Series B convertible preferred stock has identical voting
    rights as the Company's common stock and has a liquidation preference of
    $1.00 per share.
    
 
[2] STOCK OPTIONS AND WARRANTS:
 
   
   During 1996, the Board of Directors and stockholders approved the adoption of
    the 1996 Stock Option Plan (the "1996 Plan"). The 1996 Plan, as amended,
    provides for the granting of both incentive and non-qualified options to
    purchase up to 1,050,000 shares of common stock of the Company.
    
 
   The term of options granted under the 1996 Plan may not exceed ten years
    (five years in the case of an incentive stock option granted to an optionee
    owning more than 10% of the voting stock of the Company). The option price
    for incentive stock options can not be less than 100% of the fair market
    value of the shares of common stock at the time the option is granted (110%
    for a 10% stockholder). The exercise price for non-qualified options is set
    by the Compensation Committee in its discretion.
 
   The following table summarizes the activity under the 1996 Plan:
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED DECEMBER 31,
                                                     ----------------------------------------------
                                                                                                        SIX MONTHS ENDED
                                                              1996                    1997                JUNE 30, 1998
                                                     ----------------------  ----------------------  -----------------------
                                                                 WEIGHTED                WEIGHTED                 WEIGHTED
                                                                  AVERAGE                 AVERAGE                  AVERAGE
                                                                 EXERCISE                EXERCISE                 EXERCISE
                                                      SHARES       PRICE      SHARES       PRICE       SHARES       PRICE
                                                     ---------  -----------  ---------  -----------  ----------  -----------
<S>                                                  <C>        <C>          <C>        <C>          <C>         <C>
Options outstanding at beginning of period.........                            104,139   $    6.44      184,687   $    5.72
Granted............................................    107,398   $    6.44     159,700   $    5.54      399,832   $    5.70
Cancelled..........................................     (3,259)  $    6.44     (79,152)  $    6.30     (135,644)  $    5.60
                                                     ---------               ---------               ----------
Options outstanding at end of period...............    104,139   $    6.44     184,687   $    5.72      448,875   $    5.74
                                                     ---------               ---------               ----------
                                                     ---------               ---------               ----------
Options exercisable at end of period...............     82,256   $    6.44     184,687   $    5.72      256,761   $    5.33
                                                     ---------               ---------               ----------
                                                     ---------               ---------               ----------
</TABLE>
 
                                      F-12
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE F--STOCKHOLDERS' EQUITY (CONTINUED)
    The following table presents information relating to stock options
    outstanding at December 31, 1997:
 
<TABLE>
<CAPTION>
OPTIONS OUTSTANDING AND EXERCISABLE
- -----------------------------------
<S>        <C>          <C>
                         WEIGHTED
            WEIGHTED      AVERAGE
             AVERAGE     REMAINING
            EXERCISE      LIFE IN
 SHARES       PRICE        YEARS
- ---------  -----------  -----------
82,876...   $    4.83         9.75
101,811..   $    6.44         9.03
- ---------
184,687..   $    5.72         9.35
- ---------
- ---------
</TABLE>
 
    The following table presents information relating to stock options
    outstanding at June 30, 1998 (unaudited):
 
<TABLE>
<CAPTION>
        OPTIONS OUTSTANDING                   OPTIONS EXERCISABLE
- -----------------------------------  -------------------------------------
<S>        <C>          <C>          <C>        <C>          <C>
                         WEIGHTED                              WEIGHTED
            WEIGHTED      AVERAGE                WEIGHTED       AVERAGE
             AVERAGE     REMAINING                AVERAGE      REMAINING
            EXERCISE      LIFE IN                EXERCISE       LIFE IN
 SHARES       PRICE        YEARS      SHARES       PRICE         YEARS
- ---------  -----------  -----------  ---------  -----------  -------------
  130,989   $    4.83         9.56     130,989   $    4.83          9.56
  197,828   $    5.60         9.92      88,214   $    5.60          9.92
   37,558   $    6.44         8.42      37,558   $    6.44          8.42
   82,500   $    7.20        10.00
- ---------                            ---------
  448,875   $    5.74         9.70     256,761   $    5.33          9.51
- ---------                            ---------
- ---------                            ---------
</TABLE>
 
    The weighted average fair value at date of grant for options granted during
    the years ended December 31, 1996 and 1997 and the six months ended June 30,
    1997 and 1998 were $3.20, $2.76, $3.21 and $2.70 per option, respectively.
    The fair value of options at date of grant was estimated using the
    Black-Scholes option pricing model utilizing the following weighted average
    assumptions:
 
   
<TABLE>
<CAPTION>
                                                              DECEMBER 31,            JUNE 30,
                                                          --------------------  --------------------
<S>                                                       <C>        <C>        <C>        <C>
                                                            1996       1997       1997       1998
                                                          ---------  ---------  ---------  ---------
Risk-free interest rates................................       6.43%      6.50%      6.59%      5.62%
Expected option life in years...........................          6          6          6          6
Expected stock price volatility.........................         40%        40%        40%        40%
Expected dividend yield.................................          0%         0%         0%         0%
</TABLE>
    
 
   Had the Company elected to recognize compensation cost based on the fair
    value of the options at the date of grant as prescribed by SFAS 123, net
    loss for the years ended December 31, 1996 and 1997 and for the six-month
    periods ended June 30, 1997 and 1998 would have been $(4,842,000),
    $(2,830,000), $(1,007,000) and $(2,898,000) or $(2.65), $(1.53), $(.52) and
    $(1.71), respectively, per share.
 
                                      F-13
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE F--STOCKHOLDERS' EQUITY (CONTINUED)
[3] The Company has the following warrants and options referred to in [4] below
    to purchase common stock outstanding as of December 31, 1997:
 
<TABLE>
<CAPTION>
 NUMBER
   OF       EXERCISE
 SHARES       PRICE
- ---------  -----------
<S>        <C>
186,239..   $    1.61
62,856...        2.42
62,080...        3.22
70,949...        4.83
318,159..        6.44
93,120...        9.66
- ---------
  793,403
- ---------
- ---------
</TABLE>
 
    From March through May 1998, in connection with the issuance of notes (see
    Note E[5]), the Company issued warrants to purchase 325,919 shares of the
    Company's common stock at an exercise price of $4.83. The Company also
    issued a warrant to purchase 6,208 shares of the Company's common stock at
    an exercise price of $6.04 for services rendered.
 
    On July 8, 1998, the Company entered into an agreement with certain of its
    option and warrant holders pursuant to which the Company issued 596,741
    shares of its common stock in exchange for cancellation of outstanding
    warrants to purchase 789,521 shares of the Company's common stock.
 
[4] PRIVATE PLACEMENT:
 
   During March 1996, the Company completed a private placement of its
    securities. The Company issued 667,357 shares of its common stock for $6.44
    a share, yielding gross proceeds of $4,300,000. In connection with the
    private placement the Company incurred costs aggregating $352,000 including
    $279,000 in commissions and expense allowance paid to the placement agent.
    The Company also issued options to purchase 66,736 shares of common stock at
    an exercise price of $6.44 per share expiring in March 2001 to the placement
    agents in connection with the private placement. The investors in the
    private placement were granted certain demand and piggyback registration
    rights. The Company also sold 31,040 shares of stock in 1996 receiving
    proceeds of $200,000.
 
NOTE G--COMMITMENTS AND CONTINGENCIES
 
[1] OPERATING LEASES:
 
   The Company leases office facilities in Florida, New York and Texas under
    operating leases expiring through 1999. Rental commitments for the remaining
    term of the Company's noncancellable leases relating to office space
    expiring at various dates through 1999 are as follows:
 
<TABLE>
<CAPTION>
  YEAR ENDING
  DECEMBER 31,
- ----------------
<S>               <C>
1998............  $  120,000
1999............      31,000
                  ----------
                  $  151,000
                  ----------
                  ----------
</TABLE>
 
    Rental expense for the years December 31, 1996 and 1997 and for the
    six-month periods ended June 30, 1997 and 1998 aggregated $142,000,
    $146,000, $71,000 and $71,000, respectively.
 
                                      F-14
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE G--COMMITMENTS AND CONTINGENCIES (CONTINUED)
[2] SOFTWARE DISTRIBUTION AGREEMENTS:
 
    [A] In June 1997, the Company entered into a software distribution agreement
       pursuant to which the Company licensed, on a nonexclusive basis, the
       right to incorporate and/or bundle certain technology of the Company,
       with the customer's products. In connection therewith, the Company, which
       is entitled to royalties based on the customer's sales, received a
       $500,000, nonrefundable prepaid royalty, which is included in license
       revenue for the year ended December 31, 1997 and the six months ended
       June 30, 1997.
 
    [B] In September 1997, the Company entered into a software distribution
       agreement, pursuant to which the Company has the right to incorporate
       certain technology into its software. The Company is required to make
       certain royalty payments based on unit sales as defined. The Company is
       obligated to pay a minimum of $100,000 in royalties pursuant to the
       agreement for the period September 1997 to March 30, 1999. As of December
       31, 1997 and June 30, 1998, accrued royalty payable was approximately
       $29,000 and $44,000, respectively.
 
    [C] In July 1996, the Company entered into an agreement pursuant to which
       certain technology was developed for the Company. The Company is required
       to make certain royalty payments based on unit sales as defined, up to a
       maximum royalty payment of $100,000. For the year ended December 31, 1997
       and the six months ended June 30, 1998, royalties owed pursuant to such
       agreement were de minimus.
 
[3] EMPLOYMENT AGREEMENTS:
 
   In May 1998, the Company entered into an employment agreement with its
    President and Chief Executive Officer which provides for a base salary of
    $150,000, subject to annual increases of up to 20% by the Board of Directors
    at their discretion. The agreement also provides for an annual bonus of up
    to $50,000 as determined by the Board of Directors in its discretion. The
    agreement expires in May 2002. In connection therewith, the Company granted
    the President a five-year option to purchase 294,879 shares of the Company's
    common stock at an exercise price of $2.42 per share. The option vests 34%
    immediately and then 22% per year thereafter. As the estimated fair value of
    the Company's common stock at the date of grant of the option ($5.60 per
    share) was in excess of the exercise price the Company will incur aggregate
    compensation expense of approximately $938,000 over the service period,
    $366,000 of which was charged to expense during the six months ended June
    30, 1998 based on the vesting provisions of the option.
 
   The Company has employment agreements with six other officers providing for
    aggregate annual salaries of $120,000 through April 1999 with respect to one
    officer and aggregate annual salaries of $640,000 through May and August
    2001 with respect to five officers. Certain of the agreements provide for
    the granting of bonuses at the discretion of the Board of Directors, as well
    as options to purchase shares of common stock.
 
   Aggregate salary commitments pursuant to employment agreements are $804,000,
    $820,000, $790,000, $470,000 and $56,000 for 1998, 1999, 2000, 2001 and
    2002, respectively.
 
                                      F-15
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE G--COMMITMENTS AND CONTINGENCIES (CONTINUED)
[4] SAVINGS AND INVESTMENT PLAN:
 
   The Company has a Savings and Investment Plan which allows participants to
    make contributions by salary reduction pursuant to Section 401(k) of the
    Internal Revenue Code of 1986. The Company also may make discretionary
    annual matching contributions in amounts determined by the Board of
    Directors, subject to statutory limits. The Company did not make any
    contributions to the 401(k) Plan during the years ended December 31, 1996
    and 1997 and the six months ended June 30, 1998.
 
[5] FINANCIAL ADVISORY AGREEMENT:
 
   In September 1996, as amended in January 1997, the Company entered into a
    financial advisory agreement with a corporation owned by the Chairman of the
    Board and a principal stockholder, which expires in January 1999. Pursuant
    to such agreement, monthly fees of $12,500 were to be paid to such
    corporation, and the Company issued two 7-year warrants, each to purchase up
    to 31,040 shares of common stock at an exercise price of $6.44 and $8.05,
    respectively. Such exercise prices were subsequently reduced to an exercise
    price of $1.61 per share (see Note E[3]). The Company also agreed to pay
    such corporation and another corporation which is a principal stockholder of
    the Company, a cash fee equal to 3% of the total proceeds or other
    consideration received in connection with a merger or sale of substantially
    all of the Company's assets completed by January 2001. Expenses under the
    agreement, including amortization of the value ascribed to the warrants,
    included in general and administrative expenses, for the year ended December
    31, 1997 and the six-month periods ended June 30, 1997 and 1998 amounted to
    $253,000, $135,000 and $121,000, respectively.
 
   On May 14, 1998, the Company terminated the monthly fee provision of the
    financial advisory agreement and issued 31,250 shares of common stock to
    this entity in satisfaction of amounts owed pursuant the agreement.
 
NOTE H--INCOME TAXES
 
    The principal components of deferred tax assets and valuation allowance are
as follows:
 
<TABLE>
<CAPTION>
                                                                                  SIX MONTHS
                                                            YEAR ENDED               ENDED
                                                   DECEMBER 31,                    JUNE 30,
                                                       1996           1997           1998
                                                   -------------  -------------  -------------
<S>                                                <C>            <C>            <C>
Deferred tax assets:
  Net operating loss carryforwards...............  $   1,464,000  $   2,122,000  $   2,882,000
  Common stock and warrants issued for
    compensation and debt discount, not yet
    deducted for tax purposes....................        266,000        525,000        503,000
  Other..........................................        240,000        261,000        275,000
                                                   -------------  -------------  -------------
                                                       1,970,000      2,908,000      3,660,000
Valuation allowance..............................     (1,970,000)    (2,908,000)    (3,660,000)
                                                   -------------  -------------  -------------
Net deferred tax asset...........................  $           0  $           0  $           0
                                                   -------------  -------------  -------------
                                                   -------------  -------------  -------------
</TABLE>
 
                                      F-16
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE H--INCOME TAXES (CONTINUED)
    The Company has recorded a valuation allowance for the full amount of its
deferred tax assets as the likelihood of its future realization cannot be
presently determined.
 
    The difference between the tax benefit and the amount that would be computed
by applying the statutory federal income tax rate to loss before taxes is
attributable to the following:
 
<TABLE>
<CAPTION>
                                                                              SIX MONTHS ENDED
                                                           YEAR ENDED
                                                          DECEMBER 31,            JUNE 30,
                                                      --------------------  --------------------
                                                        1996       1997       1997       1998
                                                      ---------  ---------  ---------  ---------
<S>                                                   <C>        <C>        <C>        <C>
Income tax benefit--statutory rate..................      (34.0)%     (34.0)%     (34.0)%     (34.0)%
Increase in valuation allowance on deferred tax
  assets............................................       34.0%      34.0%      34.0%      34.0%
                                                      ---------  ---------  ---------  ---------
                                                              0%         0%         0%         0%
                                                      ---------  ---------  ---------  ---------
                                                      ---------  ---------  ---------  ---------
</TABLE>
 
    At December 31, 1997, the Company has available net operating loss
carryforwards to reduce future federal taxable income of approximately
$5,500,000 for tax reporting purposes which expire from 2009 through 2012.
Pursuant to the provisions of the Internal Revenue Code, future utilization of
these past losses is subject to certain limitations based on changes in the
ownership of the Company's stock that have occurred or are likely to occur.
 
NOTE I--OTHER MATTERS
 
[1] For the year ended December 31, 1997, approximately $500,000 (21%), $362,000
    (15%) and $298,000 (13%) of the Company's revenues were from three
    customers. For the six months ended June 30, 1998, approximately $285,000
    (32%), $154,000 (17%) and $95,000 (11%) of the Company's revenues
    respectively, were from one customer, the second customer referred to above,
    and a third customer. No customer accounted for 10% or more of the Company's
    revenue for the year ended December 31, 1996 and one customer accounted for
    $500,000 in sales (35%) for the six months ended June 30, 1997.
 
[2] For the years ended December 31, 1996 and 1997 and for the six months ended
    June 30, 1997 and 1998, export sales of the Company's products amounted to
    approximately $69,000, $370,000, $237,000 and $16,000, respectively.
 
NOTE J--SUBSEQUENT EVENTS
 
   
[1]  In August, 1998 the Company formed a wholly owned subsidiary, Network-1
    Acquisition Corp. (the "Purchaser"). Pursuant to an agreement and plan of
    merger dated September 11, 1998 between the Company, the Purchaser and
    CommHome Systems Corporation ("CommHome"), upon closing of the Offering
    CommHome will be merged with and into the Purchaser with the shareholders of
    CommHome receiving 46,667 shares of the Company's common stock. The
    Company's President is also the President of CommHome and owns 51% of its
    outstanding common stock. The Purchaser also agreed to assume liabilities of
    CommHome of up to $200,000 including $105,000 which is owed to two officers
    of the Company and which will be satisfied by the issuance of 17,500 shares
    of the Company's common stock. The Company will incur a charge of
    approximately $469,000 for purchased research and development upon the
    acquisition which will be accounted for as a purchase. CommHome is a
    
 
                                      F-17
<PAGE>
                       NETWORK-1 SECURITY SOLUTIONS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
          (UNAUDITED WITH RESPECT TO DATA AS OF JUNE 30, 1998 AND FOR
              THE SIX-MONTH PERIODS ENDED JUNE 30, 1997 AND 1998)
 
NOTE J--SUBSEQUENT EVENTS (CONTINUED)
    development stage company and has had no revenues. The principal activity
    has been the design of residential networking solutions. The Company intends
    to incorporate CommHome's designs into its future security products.
 
   
[2] In October 1998, the Company entered into an agreement, effective upon
    consummation of the Offering, with certain of its holders of outstanding
    promissory notes, including accrued interest, of $3,204,888 (See Note E),
    pursuant to which the Company will issue 562,836 shares of Series C
    Preferred Stock in exchange for cancellation of promissory notes, including
    accrued interest, of $2,954,888, subject to adjustment in the event the
    Underwriter's over-allotment option is exercised. The balance of the
    promissiory notes in the principal amount of $250,000 will be repaid from
    the proceeds of the Offering. In the event the Underwriter's over-allotment
    option is exercised in whole or in part, 50% of the net proceeds received by
    the Company from such exercise shall be used to repay the promissiory notes
    on a pro-rata basis and the 562,836 shares of Series C Preferred Stock to be
    issued to the holders of the promissory notes shall be proportionately
    reduced.
    
 
   
    Upon consummation of the Offering, the Company will have outstanding 562,836
    shares of Series C Convertible Preferred Stock (subject to adjustment in the
    event the Underwriter exercises the over-allotment option). The Series C
    Convertible Preferred Stock is convertible on a 1-to-1 basis into common
    shares and has identical voting rights as the Company's Common Stock, will
    have a liquidation preference of $5.25 per share and will be entitled to
    equivalent dividends and distributions as those paid on Common Shares.
    
 
   
[3] In October 1998, the Company was notified by the licensee of the June 1997
    software distribution agreement (see Note G[2][a]) that it was terminating
    the agreement effective December 31, 1998.
    
 
                                      F-18
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS IN CONNECTION WITH THIS OFFERING AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY OR THE UNDERWRITER. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER
TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY SECURITY OTHER THAN THE
SECURITIES OFFERED BY THIS PROSPECTUS, OR AN OFFER TO SELL OR A SOLICITATION OF
AN OFFER TO BUY ANY SECURITIES BY ANYONE IN ANY JURISDICTION IN WHICH SUCH OFFER
OR SOLICITATION IS NOT AUTHORIZED OR IS UNLAWFUL. NEITHER THE DELIVERY OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE
ANY IMPLICATION THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME
SUBSEQUENT TO THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                      PAGE
                                                      -----
<S>                                                <C>
Prospectus Summary...............................           3
Risk Factors.....................................           7
Use of Proceeds..................................          19
Dilution.........................................          21
Dividend Policy..................................          22
Capitalization...................................          22
Selected Financial Data..........................          23
Management's Discussion and Analysis of Financial
  Condition and Results of Operations............          24
Business.........................................          32
Management.......................................          46
Principal Stockholders...........................          54
Certain Transactions.............................          57
Description of Securities........................          60
Shares Eligible for Future Sale..................          62
Underwriting.....................................          63
Legal Matters....................................          64
Experts..........................................          64
Additional Information...........................          65
Index to Financial Statements....................         F-1
</TABLE>
    
 
                            ------------------------
 
    UNTIL          , 1998 (25 DAYS AFTER THE DATE OF THIS PROSPECTUS), ALL
DEALERS EFFECTING TRANSACTIONS IN THE REGISTERED SECURITIES, WHETHER OR NOT
PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS.
THIS DELIVERY REQUIREMENT IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER
A PROSPECTUS WHEN ACTING AS AN UNDERWRITER AND WITH RESPECT TO THEIR UNSOLD
ALLOTMENTS OR SUBSCRIPTIONS.
 
   
                                1,700,000 SHARES
    
 
                                     [LOGO]
 
                                  COMMON STOCK
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
                           WHALE SECURITIES CO., L.P.
 
                                         , 1998
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 24. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    As permitted by Section 102(b)(7) of the Delaware General Corporation Law
(the "GCL"), Article VI of the Company's Amended and Restated Certificate of
Incorporation, filed as Exhibit 3.1 hereto, includes a provision that eliminates
any director's personal liability to the Company or its stockholders for
monetary damages for breach of fiduciary duty as a director. Such elimination of
personal liability does not apply to the following: (i) breach of the duty of
loyalty to the Company or its stockholders; (ii) acts or omissions not in good
faith or which involve intentional misconduct or a knowing violation of the law;
(iii) payment of an illegal dividend or an illegal redemption or purchase of the
Company's stock, pursuant to Section 174 of the GCL; or (iv) any transaction
from which the director derived an improper benefit. If the GCL is amended to
authorize corporate action further eliminating or limiting the personal
liability of directors, then the liability of a director of the Company shall be
eliminated or limited to the fullest extent permitted by the GCL, as so amended.
Any repeal or modification of this Article by the stockholders of the Company
shall not adversely affect any right or protection of a director of the Company
with respect to events occurring prior to the time of such repeal or
modification.
 
    As permitted by Section 145 of the GCL, pursuant to Article VII of the
Company's Amended and Restated Certificate of Incorporation, the Company, to the
fullest extent permitted by the provisions of the GCL, as now or hereafter in
effect, indemnifies any director, officer, employee or agent of the Company and
certain other persons serving at the request of the Company in related
capacities against amounts paid and expenses incurred in connection with an
action or proceeding to which that person is or is threatened to be made a party
by reasons of such position, if such person shall have acted in good faith and
in a manner he reasonably believed to be in or not opposed to the best interests
of the Company and, in any criminal proceeding, if such person had no reasonable
cause to believe his conduct was unlawful; provided that, in the case of actions
brought by or in the right of the Company, no indemnification shall be made with
respect to any matter as to which such person shall have been adjudged to be
liable to the Company unless and only to the extent that the adjudicating court
determines that such indemnification is proper under the circumstances. The
indemnification provided by Article VII of the Company's Amended and Restated
Certificate of Incorporation does not limit or exclude any rights, indemnities
or limitations of liability to which any person may be entitled, whether as a
matter of law, under the Bylaws of the Company, by agreement, vote of the
stockholders or vote of disinterested directors of the Company or otherwise.
 
    The Company believes that the indemnification provisions contained in
Article VI and Article VII of the Company's Amended and Restated Certificate of
Incorporation have assisted and will assist the Company in attracting and
retaining qualified individuals to serve as directors and officers.
 
    The Underwriting Agreement, filed as Exhibit 1.1 hereto, provides for
indemnification by the Underwriter of the Company, its directors and officers,
and by the Company of the Underwriter, for certain liabilities, including
liabilities under the Act, and affords certain rights of contribution with
respect thereto.
 
ITEM 25. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
    The following table sets forth all expenses, other than underwriting
discounts and commissions, payable by the Company in connection with the sale of
the securities being registered.
 
                                      II-1
<PAGE>
    The foregoing, except for the SEC Registration Fee and NASD Filing Fee are
estimates.
 
   
<TABLE>
<S>                                                                               <C>
SEC Registration Fee............................................................  $5,818.94
 
NASD Filing Fee.................................................................  $2,472.52
 
NASDAQ SmallCap Listing Fee.....................................................  $  10,000
 
Boston Stock Exchange Listing Fee...............................................  $   7,500
 
Accounting Fees and Expenses....................................................  $ 135,000
 
Legal Fees and Expenses (other than Blue Sky)...................................  $ 300,000
 
Blue Sky Fees and Expenses (including legal and filing fees)....................  $  50,000
 
Printing and Engraving Expenses.................................................  $ 125,000
 
Directors' and Officers' Liability Insurance....................................  $  70,000
 
Transfer Agent Fees and Expenses................................................  $   2,500
 
Miscellaneous...................................................................  $20,708.54
                                                                                  ---------
 
Total...........................................................................  $ 729,000
</TABLE>
    
 
ITEM 26. RECENT SALES OF UNREGISTERED SECURITIES
 
    During the past three years, the Company has issued unregistered securities
to the persons described below. No underwriting discounts or commissions were
paid in connection with such issuance of securities, except in connection with
the Company's issuance of an aggregate 667,359 shares of Common Stock on March
14, 1996 and March 21, 1996 (the "March 1996 Private Offering," as further
described below under paragraph 5). In issuing the securities described below,
the Company relied upon the exemption from the registration requirements of the
Securities Act of 1933, as amended (the "Securities Act"), by reason of Section
4(2) thereof and Regulation D promulgated thereunder, based on the fact that
each investor was either an "accredited investor" as such term is defined in
Rule 501 of Regulation D promulgated under the Securities Act or such investor
had such knowledge and experience in financial and business matters that such
person was capable of evaluating the merits and risks of the investment. The
share amounts below reflect a stock split at the rate of 12,836.97-to-1 on March
2, 1994, and a reverse stock split at the rate of 1-for-1.61083 on July 20,
1998.
 
(1) On November 29, 1995, the Company issued to Corey M. Horowitz warrants to
    purchase 124,159 shares of Common Stock at an exercise price of $3.22 per
    share, expiring November 29, 2005, in consideration for a loan of $150,000.
 
(2) On November 29, 1995, the Company issued to the CAPCOR Employee Pension Plan
    warrants to purchase 62,080 shares of Common Stock at an exercise price of
    $3.22 per share, expiring November 29, 2005, in consideration for a loan of
    $75,000.
 
(3) On March 14, 1996, the Company issued to each of Irwin Lieber, Barry
    Rubenstein and Eli Oxenhorn warrants to purchase 31,040 shares of Common
    Stock at an exercise price of $6.44 per share, expiring March 14, 2006, and
    warrants to purchase 31,040 shares of Common Stock at an exercise price of
    $9.67 per share, expiring March 14, 2006, in consideration for their
    agreement to serve on the Company's advisory board.
 
(4) On March 14, 1996, the Company issued to Bizar Martin & Taub, LLP warrants
    to purchase 9,312 shares of Common Stock at an exercise price of $6.44 per
    share, expiring March 14, 2006, in consideration for services rendered.
 
                                      II-2
<PAGE>
(5) On March 14, 1996 and March 21, 1996, in connection with the March 1996
    Private Offering, the Company issued to 34 investors an aggregate 667,359
    shares of Common Stock, in consideration for payment of $6.44 per share, for
    an aggregate consideration of $4.3 million. GKN Securities Corp. served as
    Placement Agent for the March 1996 Private Offering, and received a 4.5%
    sales commission (or $193,500). The Company also issued to GKN Securities
    Corp., related parties and Barington Capital Group, L.P. options to purchase
    an aggregate 66,736 shares of Common Stock at an exercise price of $6.44 per
    share, expiring March 14, 2001, in consideration of $100. The following
    investors participated in the March 1996 Private Offering:
 
<TABLE>
<CAPTION>
NAME                                                        AMOUNT INVESTED  NUMBER OF SHARES
- ----------------------------------------------------------  ---------------  -----------------
<S>                                                         <C>              <C>
ALSA, Inc.................................................   $      50,000            7,760
Applewood Associates, L.P.................................       2,000,000          310,399
Neil Bellet...............................................          25,000            3,880
Jay H. Bernstein..........................................          50,000            7,760
Stanley H. Blum...........................................          50,000            7,760
Elliott Broidy............................................         100,000           15,520
Eliot Brown...............................................          25,000            3,880
Kenneth D. Cole...........................................          25,000            3,880
Dalewood Associates, L.P..................................         150,000           23,280
E&M RP Trust..............................................         100,000           15,520
Craig Effron..............................................          35,000            5,432
Steven Etra...............................................          50,000            7,760
Barry K. Fingerhut........................................         200,000           31,040
Lloyd Goldman.............................................          25,000            3,880
Richard C. Kaufman &
Elaine J. Lenart JTRWOS...................................          50,000            7,760
Irwin Lieber..............................................         150,000           23,280
Jonathan Lieber...........................................          20,000            3,104
Seth Lieber...............................................          30,000            4,656
Lyonshare Venture Capital.................................          50,000            7,760
Mariwood Investments......................................          35,000            5,432
Jody Miller...............................................          25,000            3,880
Eli Oxenhorn..............................................         200,000           31,040
Jonathan Robinson.........................................          25,000            3,880
Andrew Rosen..............................................          25,000            3,880
Steven Rosen..............................................          25,000            3,880
Barry Rubenstein..........................................         200,000           31,040
Curtis Schenker...........................................          30,000            4,656
Seneca Ventures...........................................         150,000           23,280
Matthew Smith.............................................          10,000            1,552
David Thalheim............................................          50,000            7,760
Michael Weissman..........................................          25,000            3,880
Lance Wolfson.............................................          25,000            3,880
William Wolfson...........................................          25,000            3,880
Woodland Venture Fund.....................................         265,000           41,128
                                                            ---------------         -------
Total.....................................................   $   4,300,000          667,359
</TABLE>
 
(6) On March 14, 1996, the Company issued to Corey M. Horowitz 24,832 shares of
    Common Stock and 83,808 shares of Common Stock to Security Partners, L.P. in
    consideration for conversion of outstanding debt in the aggregate principal
    amount of $700,000.
 
                                      II-3
<PAGE>
(7) On March 21, 1996, the Company issued to J. Robert Scott, Inc. 6,467 shares
    of Common Stock in consideration for services rendered.
 
(8) On April 26, 1996, the Company issued to Michael Stansky and Jill Stansky as
    Tenants of the Entirety, w/r/o/s, 3,880 shares of Common Stock, in
    consideration for payment of $6.44 per share or aggregate consideration of
    $25,000.
 
(9) On April 28, 1996, the Company issued to James J. Pallotta 7,760 shares of
    Common Stock, in consideration for payment of $6.44 per share or aggregate
    consideration of $50,000.
 
(10) On April 29, 1996, the Company issued to Robert Russo 2,483 shares of
    Common Stock in consideration for services rendered as the Company's
    President.
 
(11) On June 3, 1996, the Company issued to Navigator Fund, L.P. 17,615 shares
    of Common Stock in consideration for payment of $6.44 per share or aggregate
    consideration of $113,500.
 
(12) On June 3, 1996, the Company issued to Navigator Global Fund 1,785 shares
    of Common Stock in consideration for payment of $6.44 per share or aggregate
    consideration of $11,500.
 
(13) On October 3, 1996, the Company issued to each of Craig Bandes and Mona
    Geller 7,760 shares of Common Stock, upon the exercise of stock options by
    Bandes and Geller at an exercise price of $1.61 per share or aggregate
    consideration of $25,000. The stock options had been issued pursuant to
    Stock Option Agreements, dated April 4, 1994, in consideration for financial
    advisory services rendered to the Company.
 
(14) On October 11, 1996, the Company issued to CMH Capital Management Corp.
    ("CMH") warrants to purchase 31,040 shares of Common Stock at an exercise
    price of $8.05 per share, expiring October 11, 2003, in consideration for
    financial advisory services.
 
(15) On October 22, 1996, the Company issued to Communica, Inc. and related
    parties 9,312 shares of Common Stock in consideration for services rendered.
 
   
(16) The Company's Stock Option Plan provides for the grant of stock options to
    key employees, directors, and consultants of the Company (the "Stock Option
    Plan"). Under the Stock Option Plan, employees (including officers and
    employee directors) are eligible to receive grants of incentive stock
    options, which are intended to be "Incentive Stock Options" as defined by
    Section 422 of the Internal Revenue Code of 1986, as amended. Employees
    (including officers), directors of the Company or any affiliates or
    consultants are eligible to receive grants of non-qualified options. An
    aggregate of 1,050,000 shares of Common Stock has been reserved for issuance
    upon exercise of outstanding options issued under the Stock Option Plan. The
    Company believes that the Stock Option Plan grants described in this
    paragraph are exempt from the registration requirements of the Securities
    Act by reason of Rule 701 promulgated thereunder, because such options were
    granted pursuant to a written compensatory benefit plan of the Company,
    copies of which were provided to each participant, and the aggregate
    offering price did not exceed the limit prescribed by Rule 701 in connection
    with any such grant. As of October 20, 1998, pursuant to the Stock Option
    Plan, options to purchase an aggregate of 855,216 shares of Common Stock
    were outstanding, including options to purchase 86,290 shares of Common
    Stock at an exercise price of $4.83 per share, options to purchase 194,628
    shares of Common Stock at an exercise price of $5.60 per share and options
    to purchase 574,298 shares of Common Stock at an exercise price of $6.00 per
    share. No such outstanding options had been exercised.
    
 
(17) On January 15, 1997, the Company issued to CMH warrants to purchase 31,040
    shares of Common Stock at an exercise price of $6.44 per share, expiring
    January 15, 2004, in consideration for financial advisory services to the
    Company.
 
(18) In February and April of 1997, the Company borrowed $1 million through the
    issuance to ten (10) investors of unsecured promissory notes, bearing 6%
    interest (the "February and April 1997
 
                                      II-4
<PAGE>
    Private Financing"), and due at the earlier of (i) one year from the date of
    issuance, (ii) the date upon which the Company receives $4,000,000 net
    proceeds (after deduction of all related offering expenses) of equity or
    debt financing from one transaction or a series of transactions, (iii) a
    sale of all or substantially all of the Company's assets or (iv) a merger or
    consolidation of the Company. In addition, as part of the February and April
    1997 Private Financing, investors received receive ten (10) year warrants to
    purchase an aggregate of 139,679 shares of Common Stock at an exercise price
    of $6.44 per share (the "Warrants"), as follows:
 
       (a) On February 24, 1997, the Company issued to Charles P. Stevenson, Jr.
           warrants to purchase 13,968 shares of Common Stock in consideration
           for a loan of $100,000;
 
       (b) On February 24, 1997, the Company issued to Albert Kalimian warrants
           to purchase 6,984 shares of Common Stock in consideration for a loan
           of $50,000;
 
       (c) On February 24, 1997, the Company issued to Raptur Management Co.
           warrants to purchase 13,968 shares of Common Stock in consideration
           for a loan of $100,000;
 
       (d) On February 24, 1997, the Company issued to Douglas Lipton warrants
           to purchase 6,984 shares of Common Stock in consideration for a loan
           of $50,000;
 
       (e) On February 24, 1997, the Company issued to Applewood Associates,
           L.P. warrants to purchase 34,920 shares of Common Stock in
           consideration for a loan of $250,000;
 
       (f) On February 24, 1997, the Company issued to Lawrence Wein warrants to
           purchase 3,492 shares of Common Stock in consideration for a loan of
           $25,000;
 
       (g) On February 24, 1997, the Company issued to Steven Heineman warrants
           to purchase 3,492 shares of Common Stock in consideration for a loan
           of $25,000;
 
       (h) On February 24, 1997, the Company issued to Herb Karlitz warrants to
           purchase 6,984 shares of Common Stock in consideration for a loan of
           $50,000;
 
       (i) On April 29, 1997, the Company issued to Navigator Fund, L.P.
           warrants to purchase 42,882 shares of Common Stock in consideration
           for a loan of $307,000; and
 
       (j) On April 29, 1997, the Company issued to Navigator Global Fund
           warrants to purchase 6,006 shares of Common Stock in consideration
           for a loan of $43,000.
 
(19) On February 24, 1997, the Company issued to Alan Kaufman warrants to
    purchase 9,312 shares of Common Stock at an exercise price of $6.44 per
    share, expiring February 24, 2007, in consideration for services rendered.
 
(20) On August 8, 1997, the Company agreed to reduce the exercise prices of
    warrants to purchase 31,040 shares of Common Stock, at an exercise price of
    $8.05 per share, issued to CMH on October 11, 1996 and warrants to purchase
    31,040 shares of Common Stock, at an exercise price of $6.44 per share,
    issued to CMH on January 15, 1997, to an exercise price of $3.22 per share,
    in consideration for a loan $100,000 made by CMH. In addition, the Company
    agreed to reduce the exercise price of warrants to purchase 124,159 shares
    of Common Stock, at an exercise price of $3.22 per share, issued to Corey M.
    Horowitz on November 29, 1995, to an exercise price of $1.61 per share, in
    consideration for that same loan.
 
(21) On September 26, 1997, the Company issued to Applewood Associates, L.P.
    warrants to purchase 62,080 shares of Common Stock at an exercise price of
    $4.83 per share, expiring September 26, 2007, in consideration for a loan of
    $350,000.
 
(22) On September 26, 1997, the Company issued to CMH warrants to purchase 8,869
    shares of Common Stock at an exercise price of $4.83 per share, expiring
    September 26, 2007, in consideration for a loan of $50,000.
 
                                      II-5
<PAGE>
(23) On November 12, 1997, the Company issued to Progressive Strategies, Inc.
    2,793 shares of Common Stock in consideration for services rendered.
 
(24) On November 21, 1997, in consideration of a loan of $50,000, the Company
    agreed to reduce the exercise prices to $1.61 of warrants to purchase 31,040
    shares of Common Stock, originally issued to CMH at an exercise price of
    $8.05 per share on October 11, 1996 and warrants to purchase 31,040 shares
    of Common Stock, originally issued to CMH at an exercise price of $6.44 per
    share on January 15, 1997.
 
(25) On February 17, 1998, the Company issued to Venture Strategies, Inc.
    warrants to purchase 6,207 shares of Common Stock at an exercise price of
    $6.04 per share, expiring February 17, 2002, in consideration for services
    rendered.
 
(26) On March 2, 1998, the Company issued an aggregate of $400,000 of promissory
    notes and ten year warrants to purchase up to 74,496 shares of Common Stock
    at an exercise price of $4.83 per share to four (4) investors including
    Applewood Associates, L.P. ($300,000 note and warrants to purchase 55,872
    shares of common stock), CMH Capital Management Corp.($50,000 note and
    warrants to purchase 9,312 shares of common stock), Robert Graifman ($25,000
    note and warrants to purchase 4,656 shares of common stock) and Herb Karlitz
    ($25,000 note and warrants to purchase 4,656 shares of common stock).
 
(27) On April 24, 1998, the Company issued to each of Corey Horowitz and MBF
    Capital Corp. ten (10) year warrants to purchase 9,312 shares of Common
    Stock at an exercise price of $4.83 per share in consideration for a loan of
    $50,000 by each party.
 
(28) On May 10, 1998, the Company issued 2,897 shares of Common Stock to High
    Tech Ventures in consideration for services rendered.
 
(29) On May 14, 1998, the Company issued an aggregate of $1,250,000 of
    promissory notes and ten (10) year warrants to purchase up to 232,799 shares
    of Common Stock at an exercise price of $4.83 per share to Applewood
    Associates, L.P. ($1,000,000 note and warrants to purchase 186,239 shares)
    and Bentley One, Ltd. ($250,000 note and warrants to purchase 46,560
    shares).
 
(30) On May 14, 1998, the Company issued 31,250 shares of Common Stock to CMH in
    connection with advisory services rendered to the Company.
 
(31) On May 18, 1998, the Company issued a five (5) year option to Avi A. Fogel
    to purchase up to 294,879 shares of the Common Stock at an exercise price of
    $2.42 per share, in consideration for Mr. Fogel's execution of his
    employment agreement. The shares underlying the option vest as follows: 34%
    on the date of issuance of the option and 22% per year for each year
    thereafter.
 
(32) On July 8, 1998, the Company issued an aggregate of 596,741 shares of its
    Common Stock in exchange for the cancellation of outstanding warrants and
    options to purchase an aggregate of 789,521 shares of Common Stock, as
    follows:
 
       (a) 261,565 shares of its Common Stock to Applewood Associates, L.P. in
           exchange for warrants to purchase 339,111 shares of Common Stock;
 
       (b) 14,070 shares of its Common Stock to CMH Capital Management Corp. in
           exchange for warrants to purchase 18,181 shares of Common Stock;
 
       (c) 117,138 shares of its Common Stock to Corey M. Horowitz in exchange
           for warrants to purchase 133,471 shares of Common Stock;
 
       (d) 49,381 shares of its Common Stock to CAPCOR Employee Pension Plan in
           exchange for warrants to purchase 62,080 shares of Common Stock;
 
                                      II-6
<PAGE>
       (e) 9,824 shares of its Common Stock to Raptur Management Co. in exchange
           for warrants to purchase 13,968 shares of Common Stock;
 
       (f) 4,912 shares of its Common Stock to Douglas Lipton in exchange for
           warrants to purchase 6,984 shares of Common Stock;
 
       (g) 2,456 shares of its Common Stock to Lawrence Wein in exchange for
           warrants to purchase 3,492 shares of Common Stock;
 
       (h) 2,456 shares of its Common Stock to Steven Heineman in exchange for
           warrants to purchase 3,492 shares of Common Stock;
 
       (i) 8,572 shares of its Common Stock to Herb Karlitz in exchange for
           warrants to purchase 11,640 shares of Common Stock;
 
       (j) 9,824 shares of its Common Stock to Charles P. Stevenson, Jr. in
           exchange for warrants to purchase 13,968 shares of Common Stock;
 
       (k) 4,912 shares of its Common Stock to Albert Kalimian in exchange for
           warrants to purchase 6,984 shares of Common Stock;
 
       (l) 30,375 shares of its Common Stock to Navigator Fund, L.P. in exchange
           for warrants to purchase 42,882 shares of Common Stock;
 
       (m) 4,254 shares of its Common Stock to Navigator Global Fund in exchange
           for warrants to purchase 6,006 shares of Common Stock;
 
       (n) 3,625 shares of its Common Stock to Robert Graifman in exchange for
           warrants to purchase 4,656 shares of Common Stock;
 
       (o) 7,278 shares of its Common Stock to MBF Capital Corp. in exchange for
           warrants to purchase 9,312 shares of Common Stock;
 
       (p) 36,441 shares of its Common Stock to Bentley One, Ltd. in exchange
           for warrants to purchase 46,560 shares of Common Stock;
 
       (q) 6,897 shares of its Common Stock to Barington Capital Group, L.P. in
           exchange for options to purchase 15,520 shares of Common Stock;
 
       (r) 9,560 shares of its Common Stock to GKN Securities Corp. in exchange
           for options to purchase 21,511 shares of Common Stock;
 
       (s) 3,869 shares of its Common Stock to David M. Nussbaum in exchange for
           options to purchase 8,707 shares of Common Stock;
 
       (t) 3,869 shares of its Common Stock to Robert Gladstone in exchange for
           options to purchase 8,707 shares of Common Stock;
 
       (u) 3,869 shares of its Common Stock to Roger Gladstone in exchange for
           options to purchase 8,707 shares of Common Stock;
 
       (v) 593 shares of its Common Stock to Deborah L. Schondorf in exchange
           for options to purchase 1,335 shares of Common Stock;
 
       (w) 104 shares of its Common Stock to Neil Betoff in exchange for options
           to purchase 233 shares of Common Stock;
 
       (x) 455 shares of its Common Stock to Richard Buonocore in exchange for
           options to purchase 1,024 shares of Common Stock;
 
                                      II-7
<PAGE>
   
       (y) 166 shares of its Common Stock to Brian K. Coventry in exchange for
           options to purchase 372 shares of Common Stock; and
    
 
   
       (z) 276 shares of its Common Stock to Andrew G. Lazarus in exchange for
           options to purchase 621 shares of Common Stock.
    
 
   
(33) On October 1, 1998, the Company issued 10,000 shares of Common Stock to CMH
    in connection with advisory services to be rendered to the Company.
    
 
   
(34) On October 19, 1998, the Company issued 1,167 shares of Common Stock to
    High Tech Ventures in consideration for services rendered.
    
 
   
(35) On October 19, 1998, the Company issued 2,053 shares of Common Stock to
    Opre Systems, Inc. in consideration for services rendered.
    
 
   
(36) On October 20, 1998, the Company entered into an agreement, effective upon
    consummation of this offering, with certain of its holders of outstanding
    promissory notes (the "Notes"), in the principal amount plus accrued
    interest of $3,204,888, pursuant to which the Company will issue 562,836
    shares of Series C Convertible Preferred Stock (the "Preferred Stock") in
    exchange for cancellation of promissory notes in the principal amount plus
    accrued interest of $2,954,888 (subject to adjustment in the event the
    Underwriter's over-allotment option is exercised in whole or in part), as
    follows:
    
 
   
       (a) 382,696 shares of Preferred Stock to Applewood Associates, L.P. in
           exchange for Notes and accrued interest of $2,009,156;
    
 
   
       (b) 32,675 shares of Preferred Stock to CMH Capital Management Corp. in
           exchange for Notes and accrued interest of $171,541;
    
 
   
       (c) 7,846 shares of Preferred Stock to Corey M. Horowitz in exchange for
           Notes and accrued interest of $41,193;
    
 
   
       (d) 16,586 shares of Preferred Stock to Raptur Management Co. in exchange
           for Notes and accrued interest of $87,075;
    
 
   
       (e) 8,293 shares of Preferred Stock to Douglas Lipton in exchange for
           Notes and accrued interest of $43,538;
    
 
   
       (f) 4,146 shares of Preferred Stock to Lawrence Wein in exchange for
           Notes and accrued interest of $21,769;
    
 
   
       (g) 4,146 shares of Preferred Stock to Steven Heineman in exchange for
           Notes and accrued interest of $21,769;
    
 
   
       (h) 12,260 shares of Preferred Stock to Herb Karlitz in exchange for
           Notes and accrued interest of $64,364;
    
 
   
       (i) 16,586 shares of Preferred Stock to Charles P. Stevenson, Jr. in
           exchange for Notes and accrued interest of $87,075;
    
 
   
       (j) 8,293 shares of Preferred Stock to Albert Kalimian in exchange for
           Notes and accrued interest of $43,538;
    
 
   
       (k) 50,432 shares of Preferred Stock to Navigator Fund, L.P. in exchange
           for Notes and accrued interest of $264,766;
    
 
   
       (l) 7,064 shares of Preferred Stock to Navigator Global Fund in exchange
           for Notes and accrued interest of $37,085;
    
 
   
       (m) 3,967 shares of Preferred Stock to Robert Graifman in exchange for
           Notes and accrued interest of $20,826; and
    
 
                                      II-8
<PAGE>
   
       (n) 7,846 shares of Preferred Stock to MBF Capital Corp. in exchange for
           Notes and accrued interest of $41,193.
    
 
ITEM 27. EXHIBITS
 
    The following is a list of all Exhibits filed as part of this Registration
Statement.
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     EXHIBIT
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
 
       1.1   Form of Underwriting Agreement***
 
       1.2   Form of Underwriter's Warrant***
 
       2.1   Merger Agreement, dated September 11, 1998, between the Company and CommHome Systems Corporation*
 
       3.1   Certificate of Incorporation of the Company, as amended (includes Form of Certificate of Designation of
             Series C Preferred Stock)***
 
       3.2   By-laws of the Company, as amended*
 
       4.1   Form of Common Stock Certificate*
 
       4.2   Company's Stock Option Plan, as amended***
 
       5.1   Opinion of Bizar Martin & Taub, LLP*
 
      10.1   Employment Agreement, dated May 18, 1998, between the Company and Avi A. Fogel, and amendment, dated May
             30, 1998*
 
      10.2   Employment Agreement, dated May 18, 1998, between the Company and Robert P. Olsen*
 
      10.3   Employment Agreement, dated May 19, 1998, between the Company and Murray P. Fish*
 
      10.4   Employment Agreement, dated June 30, 1998, between the Company and William Hancock*
 
      10.5   Employment Agreement, dated April 4, 1994, between the Company and Robert Russo, and amendments, dated
             February 16, 1996 and September 10, 1998*
 
      10.6   Waiver, dated June 30, 1998, of salary increases by William Hancock and Robert Russo*
 
      10.7   Lease and Service Agreement, dated June 5, 1998, between the Company and Alliance Wellesley L.P.*
 
      10.8   Lease, dated June 29, 1994, between the Company and Greenview Limited Partnership*
 
      10.9   Agreement, dated August 30, 1996, between the Company and CMH Capital Management Corp. ("CMH"), with
             respect to advisory services, and amendments, dated January 15, 1997 and January 30, 1997*
 
     10.10   Agreement, dated May 14, 1998, between the Company, CMH and Applewood Associates, L.P. with respect to
             advisory services*
 
     10.11   Master Software License Agreement, dated November 10, 1997, between the Company and Electronic Data
             System Corporation, and amendment, dated May 29, 1998**
 
     10.12   Software Distribution Agreement, dated June 5, 1997, between the Company and Trusted Information
             Systems, Inc.**
 
     10.13   Software Distribution Agreement, dated September 26, 1997, between the Company and Trusted Information
             Systems, Inc.**
 
     10.14   Reseller Agreement, dated April 17, 1998, between the Company and Aventail Software Corporation **
</TABLE>
    
 
                                      II-9
<PAGE>
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     EXHIBIT
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
     10.15   Agreement, dated January 31, 1997, among the Company, Robert Russo and William Hancock, in which Messrs.
             Russo and Hancock surrendered shares of Common Stock*
 
     10.16   Agreement, dated September 26, 1997, between the Company, Robert Russo, William Hancock, and Kenneth
             Conquest, in which Messrs. Russo, Hancock, and Conquest surrendered shares of Common Stock*
 
     10.17   Agreement, dated May 14, 1998, among the Company, Robert Russo and William Hancock, in which Messrs.
             Russo and Hancock surrendered shares of Common Stock*
 
     10.18   Agreement, dated May 14, 1998, between the Company and CMH, in connection with the issuance of shares
             for advisory fees*
 
     10.19   Exchange Agreement, dated July 8, 1998, between the Company and certain of its holders of outstanding
             warrants and options*
 
     10.20   Employment Agreement, dated July 31, 1998, between the Company and Joseph A. Donohue*
 
     10.21   Employment Agreement, dated August 24, 1998, between the Company and Joseph D. Harris*
 
     10.22   Agreement, dated October 1, 1998, between the Company and CMH, with respect to advisory services
 
     10.23   Agreement, dated October 20, 1998, between the Company and certain of its holders of promissory notes
 
      21.1   List of Subsidiaries of the Company*
 
      23.1   Consent of Richard A. Eisner & Company, LLP
 
      23.2   Consent of Bizar Martin & Taub, LLP (included in Exhibit 5.1)*
 
      24.1   Power of Attorney (see signature page)*
 
      27.1   Financial Data Schedule*
</TABLE>
    
 
- ------------------------
 
*   Previously filed.
 
   
**  Previously filed and confidentiality treatment has been requested for
    certain provisions.
    
 
   
*** Amendment to previously filed document filed herewith.
    
 
ITEM 28. UNDERTAKINGS
 
    The Registrant will provide to the Underwriter specified in the Underwriting
Agreement certificates in such denominations and registered in such names as
required by the Underwriter to permit prompt delivery to each purchaser.
 
    Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Securities Act") may be permitted to directors, officers and
controlling persons of the registrant pursuant to the foregoing provisions, or
otherwise, the registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim from indemnification against such liabilities (other than the
payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question of whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
                                     II-10
<PAGE>
    For purpose of determining any liability under the Securities of 1933, each
post-effective amendment that contains a Form of Prospectus shall be deemed to
be a new registration statement relating to the securities offered therein, and
the offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.
 
    For purposes of determining any liability under the Securities Act, the
information omitted from the Form of Prospectus filed as part of this
Registration Statement in reliance upon Rule 430A and contained in the Form of
Prospectus filed by Company pursuant to Rule 424(b)(1) or (4) or 497(h) under
the Securities Act shall be deemed to be part of this Registration Statement as
of the time it was declared effective.
 
                                     II-11
<PAGE>
                                   SIGNATURES
 
   
    In accordance with the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements of filing on Form SB-2 and authorized this registration
statement to be signed on its behalf by the undersigned, in the Township of
Wellesley, Commonwealth of Massachusetts, on the 22nd day of October, 1998.
    
 
                                NETWORK-1 SECURITY SOLUTIONS, INC.
 
                                By:               /s/ AVI A. FOGEL
                                     -----------------------------------------
                                                   Avi A. Fogel,
                                              CHIEF EXECUTIVE OFFICER
 
                               POWER OF ATTORNEY
 
    In accordance with the requirements of the Securities Act of 1933, this
registration statement was signed by the following persons in the capacities and
on the dates indicated:
 
   
             NAME                          TITLE                    DATE
- ------------------------------  ---------------------------  -------------------
                                President, Chief Executive
       /s/ AVI A. FOGEL           Officer and Director
- ------------------------------    (principal executive        October 22, 1998
         Avi A. Fogel             officer)
 
              *
- ------------------------------  Chief Technology Officer      October 22, 1998
      William H. Hancock          and Director
 
                                Chief Financial Officer
              *                   (principal financial
- ------------------------------    officer and principal       October 22, 1998
        Murray P. Fish            accounting officer)
 
              *
- ------------------------------  Vice President of Business    October 22, 1998
         Robert Russo             Development
 
    /s/ COREY M. HOROWITZ
- ------------------------------  Chairman of the Board of      October 22, 1998
      Corey M. Horowitz           Directors
 
       /s/ MARCUS RANUM
- ------------------------------  Director                      October 22, 1998
         Marcus Ranum
 
    
 
*By:      /s/ AVI A. FOGEL
      ------------------------
           Avi A. Fogel,
        AS ATTORNEY-IN-FACT
 
                                     II-12
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     EXHIBIT                                                                                               PAGE
- -----------  -------------------------------------------------------------------------------------------------     -----
<C>          <S>                                                                                                <C>
 
       1.1   Form of Underwriting Agreement***................................................................
 
       1.2   Form of Underwriter's Warrant***.................................................................
 
       2.1   Merger Agreement, dated September 11, 1998, between the Company and CommHome Systems
             Corporation*.....................................................................................
 
       3.1   Certificate of Incorporation of the Company, as amended (includes Form of Certificate of
             Designation of Series C Preferred Stock)***......................................................
 
       3.2   By-laws of the Company, as amended*..............................................................
 
       4.1   Form of Common Stock Certificate*................................................................
 
       4.2   Company's Stock Option Plan, as amended***.......................................................
 
       5.1   Opinion of Bizar Martin & Taub, LLP*.............................................................
 
      10.1   Employment Agreement, dated May 18, 1998, between the Company and Avi A. Fogel, and amendment,
             dated May 30, 1998*..............................................................................
 
      10.2   Employment Agreement, dated May 18, 1998, between the Company and Robert P. Olsen*...............
 
      10.3   Employment Agreement, dated May 19, 1998, between the Company and Murray P. Fish*................
 
      10.4   Employment Agreement, dated June 30, 1998, between the Company and William Hancock*..............
 
      10.5   Employment Agreement, dated April 4, 1994, between the Company and Robert Russo, and amendments,
             dated February 16, 1996 and September 10, 1998*..................................................
 
      10.6   Waiver, dated June 30, 1998, of salary increases by William Hancock and Robert Russo*............
 
      10.7   Lease and Service Agreement, dated June 5, 1998, between the Company and Alliance Wellesley
             L.P.*............................................................................................
 
      10.8   Lease, dated June 29, 1994, between the Company and Greenview Limited Partnership*...............
 
      10.9   Agreement, dated August 30, 1996, between the Company and CMH Capital Management Corp. ("CMH"),
             with respect to advisory services, and amendments, dated January 15, 1997 and January 30,
             1997.*...........................................................................................
 
     10.10   Agreement, dated May 14, 1998, between the Company, CMH and Applewood Associates, L.P. with
             respect to advisory services*....................................................................
 
     10.11   Master Software License Agreement, dated November 10, 1997, between the Company and Electronic
             Data Systems Corporation, and amendment, dated May 29, 1998**....................................
 
     10.12   Software Distribution Agreement, dated June 5, 1997, between the Company and Trusted Information
             Systems, Inc.**..................................................................................
 
     10.13   Software Distribution Agreement, dated September 26, 1997, between the Company and Trusted
             Information Systems, Inc.**......................................................................
 
     10.14   Reseller Agreement, dated April 17, 1998, between the Company and Aventail Software
             Corporation**....................................................................................
 
     10.15   Agreement, dated January 31, 1997, among the Company, Robert Russo and William Hancock, in which
             Russo and Hancock surrendered shares of Common Stock*............................................
 
     10.16   Agreement, dated September 26, 1997, between the Company, Robert Russo, William Hancock, and
             Kenneth Conquest, in which Messrs. Russo, Hancock, and Conquest surrendered shares of Common
             Stock*...........................................................................................
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     EXHIBIT                                                                                               PAGE
- -----------  -------------------------------------------------------------------------------------------------     -----
<C>          <S>                                                                                                <C>
     10.17   Agreement, dated May 14, 1998, among the Company, Robert Russo and William Hancock, in which
             Messrs. Russo and Hancock surrendered shares of Common Stock*....................................
 
     10.18   Agreement, dated May 14, 1998, between the Company and CMH, in connection with the issuance of
             shares for advisory fees*........................................................................
 
     10.19   Exchange Agreement, dated July 8, 1998, between the Company and certain of its holders of
             outstanding warrants and options*................................................................
 
     10.20   Employment Agreement, dated July 31, 1998, between the Company and Joseph A. Donohue*............
 
     10.21   Employment Agreement, dated August 24, 1998, between the Company and Joseph D. Harris*...........
 
     10.22   Agreement, dated October 1, 1998, between the Company and CMH, with respect to advisory
             services.........................................................................................
 
     10.23   Agreement, dated October 20, 1998, between the Company and certain of its holders of promissory
             notes............................................................................................
 
      21.1   List of Subsidiaries of the Company*.............................................................
 
      23.1   Consent of Richard A. Eisner & Company, LLP......................................................
 
      23.2   Consent of Bizar Martin & Taub, LLP (included in Exhibit 5.1)*...................................
 
      24.1   Power of Attorney (see signature page)*..........................................................
 
      27.1   Financial Data Schedule*.........................................................................
</TABLE>
    
 
- ------------------------
 
*   Previously filed.
 
   
**  Previously filed and confidentiality treatment has been requested for
    certain provisions.
    
 
   
*** Amendment to previously filed document filed herewith.
    

<PAGE>

                                                                     Exhibit 1.1

                       Network-1 Security Solutions, Inc.

                        1,875,000 Shares of Common Stock

                           (Par Value $.01 Per Share)

                             UNDERWRITING AGREEMENT


Whale Securities Co., L.P.                                   New York, New York
650 Fifth Avenue                                             _________  __, 1998
New York, New York 10019


Ladies and Gentlemen:

          Network-1 Security Solutions, Inc, a Delaware corporation (the
"Company"), proposes to issue and sell to Whale Securities Co., L.P. (the
"Underwriter") 1,700,000 shares of common stock, par value $.01 per share (the
"Offered Shares"), which Offered Shares are presently authorized but unissued
shares of the common stock, par value $.01 per share (individually, a "Common
Share" and collectively the "Common Shares"), of the Company. In addition, the
Underwriter, in order to cover over-allotments in the sale of the Offered
Shares, may purchase up to an aggregate of 255,000 Common Shares (the "Optional
Shares"; the Offered Shares and the Optional Shares are hereinafter sometimes
collectively referred to as the "Shares"). The Shares are described in the
Registration Statement, as defined below. The Company also proposes to issue and
sell to the Underwriter for its own account and the accounts of its designees,
warrants to purchase an aggregate of 170,000 Common Shares at an exercise price
of $9.30 per share (the "Underwriter's Warrants"), which sale will be
consummated in accordance with the terms and conditions of the form of
Underwriter's Warrant filed as an exhibit to the Registration Statement (as
hereinafter defined).

          The Company hereby confirms its agreement with the Underwriter as
follows:

          1. Purchase and Sale of Offered Shares. On the basis of the
representations and warranties herein contained, but subject to the terms and
conditions herein set forth, the Company hereby agrees to sell the Offered
Shares to the Underwriter, and the Underwriter agrees to purchase the Offered
Shares from the Company, at a purchase price of $5.40 per share. The Underwriter
plans to offer the Shares to the public at a public offering price of $6.00 per
Offered Share.

<PAGE>

          2. Payment and Delivery.

               (a) Payment for the Offered Shares will be made to the Company by
wire transfer or certified or official bank check or checks payable to its order
in New York Clearing House funds, at the offices of the Underwriter, 650 Fifth
Avenue, New York, New York 10019, against delivery of the Offered Shares to the
Underwriter. Such payment and delivery will be made at , New York City time, on
the third business day following the Effective Date (the fourth business day
following the Effective Date in the event that trading of the Offered Shares
commences on the day following the Effective Date), the date and time of such
payment and delivery being herein called the "Closing Date." The certificates
representing the Offered Shares to be delivered will be in such denominations
and registered in such names as the Underwriter may request not less than two
full business days prior to the Closing Date, and will be made available to the
Underwriter for inspection, checking and packaging at the office of the
Company's transfer agent or correspondent in New York City, American Stock
Transfer & Trust Company, 40 Wall Street, New York, New York 10005, not less
than one full business day prior to the Closing Date.

              (b)  On the Closing Date, the Company will sell the 
Underwriter's Warrants to the Underwriter or to the designees of the 
Underwriter limited to officers and partners of the Underwriter, members of 
the selling group and/or their officers or partners (collectively, the 
"Underwriter's Designees"). The Underwriter's Warrants will be in the form 
of, and in accordance with, the provisions of the Underwriter's Warrant 
attached as an exhibit to the Registration Statement. The aggregate purchase 
price for the Underwriter's Warrants is $100.00. The Underwriter's Warrants 
will be restricted from sale, transfer, assignment or hypothecation for a 
period of one year from the Effective Date, except to the Underwriter's 
Designees. Payment for the Underwriter's Warrants will be made to the Company 
by check or checks payable to its order on the Closing Date against delivery 
of the certificates representing the Underwriter's Warrants. The certificates 
representing the Underwriter's Warrants will be in such denominations and 
such names as the Underwriter may request prior to the Closing Date.

          3. Option to Purchase Optional Shares.

               (a) For the purposes of covering any over- allotments in
connection with the distribution and sale of the Offered Shares as contemplated
by the Prospectus, the Underwriter is hereby granted an option to purchase all
or any part of the Optional Shares from the Company. The purchase price to be
paid for the Optional Shares will be the same price per Optional Share

                                       -2-

<PAGE>

as the price per Offered Share set forth in Section 1 hereof. The option granted
hereby may be exercised by the Underwriter as to all or any part of the Optional
Shares at any time within 45 days after the Effective Date. The Underwriter will
not be under any obligation to purchase any Optional Shares prior to the
exercise of such option.

               (b) The option granted hereby may be exercised by the Underwriter
by giving oral notice to the Company, which must be confirmed by a letter, telex
or telegraph setting forth the number of Optional Shares to be purchased, the
date and time for delivery of and payment for the Optional Shares to be
purchased and stating that the Optional Shares referred to therein are to be
used for the purpose of covering over-allotments in connection with the
distribution and sale of the Offered Shares. If such notice is given prior to
the Closing Date, the date set forth therein for such delivery and payment will
not be earlier than either two full business days thereafter or the Closing
Date, whichever occurs later. If such notice is given on or after the Closing
Date, the date set forth therein for such delivery and payment will not be
earlier than two full business days thereafter. In either event, the date so set
forth will not be more than 15 full business days after the date of such notice.
The date and time set forth in such notice is herein called the "Option Closing
Date." Upon exercise of such option, the Company will become obligated to convey
to the Underwriter, and, subject to the terms and conditions set forth in
Section 3(d) hereof, the Underwriter will become obligated to purchase, the
number of Optional Shares specified in such notice.

               (c) Payment for any Optional Shares purchased will be made to the
Company by wire transfer or certified or official bank check or checks payable
to its order in New York Clearing House funds, at the office of the Underwriter,
against delivery of the Optional Shares purchased to the Underwriter. The
certificates representing the Optional Shares to be delivered will be in such
denominations and registered in such names as the Underwriter requests not less
than two full business days prior to the Option Closing Date, and will be made
available to the Underwriter for inspection, checking and packaging at the
aforesaid office of the Company's transfer agent or correspondent not less than
one full business day prior to the Option Closing Date.

               (d) The obligation of the Underwriter to purchase and pay for any
of the Optional Shares is subject to the accuracy and completeness (as of the
date hereof and as of the Option Closing Date) of and compliance in all material
respects with the representations and warranties of the Company herein, to the
accuracy and completeness of the statements of the Company or its

                                       -3-

<PAGE>

officers made in any certificate or other document to be delivered by the
Company pursuant to this Agreement, to the performance in all material respects
by the Company of its obligations hereunder, to the satisfaction by the Company
of the conditions, as of the date hereof and as of the Option Closing Date, set
forth in Section 3(b) hereof, and to the delivery to the Underwriter of
opinions, certificates and letters dated the Option Closing Date substantially
similar in scope to those specified in Section 5, 6(b), (c), (d), (e) and (f)
hereof, but with each reference to "Offered Shares" and "Closing Date" to be,
respectively, to the Optional Shares and the Option Closing Date.

          4. Representations and Warranties of the Company. The Company
represents and warrants to, and agrees with, the Underwriter that:

               (a) The Company is a corporation duly organized, validly existing
and in good standing under the laws of the State of Delaware, with full power
and authority, corporate and other, to own or lease and operate, as the case may
be, its properties, whether tangible or intangible, and to conduct its business
as described in the Registration Statement and to execute, deliver and perform
this Agreement and the Underwriter's Warrant Agreement and to consummate the
transactions contemplated hereby and thereby. The Company has no subsidiaries
other than Network- 1 Acquisition Corp. (the "Subsidiary"). The Subsidiary is a
corporation duly organized, validly existing and in good standing under the laws
of the state of Delaware, with full power and authority, corporate and other, to
own or lease, as the case may be, and operate its properties, whether tangible
or intangible, and to conduct its business as described in the Registration
Statement. Each of the Company and the Subsidiary is duly qualified to do
business as a foreign corporation and is in good standing in all jurisdictions
wherein such qualification is necessary, except in such jurisdictions where the
failure so to qualify or be in good standing would not have a material adverse
effect on the financial condition, results of operations, business or properties
of the Company and the Subsidiary taken as a whole.

               The Company owns 100% of the issued and outstanding shares of
capital stock of the Subsidiary, and such shares are free and clear of any
security interests, liens, encumbrances, claims and charges, and all of such
shares have been duly authorized and validly issued and are fully paid and
nonassessable. There are no options or warrants for the purchase of, or other
rights to purchase, or outstanding securities convertible into or exchangeable
for, any capital stock or other securities of the Subsidiary.


                                       -4-

<PAGE>

               (b) This Agreement has been duly executed and delivered by the
Company and constitutes the valid and binding obligation of the Company, and the
Underwriter's Warrant Agreement, when executed and delivered by the Company on
the Closing Date, will be the valid and binding obligations of the Company,
enforceable against the Company in accordance with their respective terms. The
execution, delivery and performance of this Agreement and the Underwriter's
Warrant Agreement by the Company, the consummation by the Company of the
transactions herein and therein contemplated and the compliance by the Company
with the terms of this Agreement and the Underwriter's Warrant Agreement have
been duly authorized by all necessary corporate action and do not and will not,
with or without the giving of notice or the lapse of time, or both, (i) result
in any violation of the Certificate of Incorporation or By-Laws, each as
amended, of the Company or the Subsidiary; (ii) result in a breach of or
conflict with any of the terms or provisions of, or constitute a default under,
or result in the modification or termination of, or result in the creation or
imposition of any lien, security interest, charge or encumbrance upon any of the
properties or assets of the Company or the Subsidiary pursuant to any indenture,
mortgage, note, contract, commitment or other agreement or instrument to which
the Company or the Subsidiary is a party or by which the Company or the
Subsidiary or any of their properties or assets is or may be bound or affected;
(iii) violate any existing applicable law, rule, regulation, judgment, order or
decree of any governmental agency or court, domestic or foreign, having
jurisdiction over the Company or the Subsidiary or any of their properties or
business; or (iv) have any effect on any permit, certification, registration,
approval, consent, order, license, franchise or other authorization
(collectively, the "Permits") necessary for the Company or the Subsidiary to own
or lease and operate their properties and to conduct their business or the
ability of the Company or the Subsidiary to make use thereof.

               (c) No Permits of any court or governmental agency or body, other
than under the Securities Act of 1933, as amended (the "Act"), the Regulations
(as hereinafter defined) and applicable state securities or Blue Sky laws, are
required for (i) the valid authorization, issuance, sale and delivery of the
Shares to the Underwriter, and (ii) the consummation by the Company of the
transactions contemplated by this Agreement or the Underwriter's Warrant
Agreement.

               (d) The conditions for use of a registration statement on Form
SB-2 set forth in the General Instructions to Form SB-2 have been satisfied with
respect to the Company, the transactions contemplated herein and in the
Registration Statement. The Company has prepared in conformity with the

                                       -5-

<PAGE>

requirements of the Act and the rules and regulations (the "Regulations") of the
Securities and Exchange Commission (the "Commission") and filed with the
Commission a registration statement (File No. 333-59617) on Form SB-2 and has
filed one or more amendments thereto, covering the registration of the Shares
under the Act, including the related preliminary prospectus or preliminary
prospectuses (each thereof being herein called a "Preliminary Prospectus") and a
proposed final prospectus. Each Preliminary Prospectus was endorsed with the
legend required by Item 501(a)(5) of Regulation S-B of the Regulations and, if
applicable, Rule 430A of the Regulations. Such registration statement, including
any documents incorporated by reference therein and all financial schedules and
exhibits thereto, as amended at the time it becomes effective, and the final
prospectus included therein are herein, respectively, called the "Registration
Statement" and the "Prospectus," except that, (i) if the prospectus filed by the
Company pursuant to Rule 424(b) of the Regulations differs from the Prospectus,
the term "Prospectus" will also include the prospectus filed pursuant to Rule
424(b), and (ii) if the Registration Statement is amended or such Prospectus is
supplemented after the date the Registration Statement is declared effective by
the Commission (the "Effective Date") and prior to the Option Closing Date, the
terms "Registration Statement" and "Prospectus" shall include the Registration
Statement as amended or supplemented.

               (e) Neither the Commission nor, to the best of the Company's
knowledge, any state regulatory authority has issued any order preventing or
suspending the use of any Preliminary Prospectus or has instituted or, to the
best of the Company's knowledge, threatened to institute any proceedings with
respect to such an order.

               (f) The Registration Statement when it becomes effective, the
Prospectus (and any amendment or supplement thereto) when it is filed with the
Commission pursuant to Rule 424(b), and both documents as of the Closing Date
and the Option Closing Date, referred to below, will contain all statements
which are required to be stated therein in accordance with the Act and the
Regulations and will in all material respects conform to the requirements of the
Act and the Regulations, and neither the Registration Statement nor the
Prospectus, nor any amendment or supplement thereto, on such dates, will contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading, except
that this representation and warranty does not apply to statements or omissions
made in reliance upon and in conformity with information furnished in writing to
the Company in connection with the Registration

                                       -6-


<PAGE>

Statement or Prospectus or any amendment or supplement thereto by the
Underwriter expressly for use therein.

               (g) The Company had at the date or dates indicated in the
Prospectus a duly authorized and outstanding capitalization as set forth in the
Registration Statement and the Prospectus. Based on the assumptions stated in
the Registration Statement and the Prospectus, the Company will have on the
Closing Date the adjusted stock capitalization set forth therein. Except as set
forth in the Registration Statement or the Prospectus, on the Effective Date and
on the Closing Date, there will be no options to purchase, warrants or other
rights to subscribe for, or any securities or obligations convertible into, or
any contracts or commitments to issue or sell shares of the Company's capital
stock or any such warrants, convertible securities or obligations. Except as set
forth in the Prospectus, no holders of any of the Company's securities has any
rights, "demand," "piggyback" or otherwise, to have such securities registered
under the Act.

               (h) The descriptions in the Registration Statement and the
Prospectus of contracts and other documents are accurate and present fairly the
information required to be disclosed, and there are no contracts or other
documents required to be described in the Registration Statement or the
Prospectus or to be filed as exhibits to the Registration Statement under the
Act or the Regulations which have not been so described or filed as required.

               (i) Richard A. Eisner & Company, LLP, the accountants who have
certified certain of the financial statements filed and to be filed with the
Commission as part of the Registration Statement and the Prospectus, are
independent public accountants within the meaning of the Act and Regulations.
The financial statements and schedules and the notes thereto filed as part of
the Registration Statement and included in the Prospectus are complete, correct
and present fairly the financial position of the Company as of the dates
thereof, and the results of operations and changes in financial position of the
Company for the periods indicated therein, all in conformity with generally
accepted accounting principles applied on a consistent basis throughout the
periods involved except as otherwise stated in the Registration Statement and
the Prospectus. The selected financial data set forth in the Registration
Statement and the Prospectus present fairly the information shown therein and
have been compiled on a basis consistent with that of the audited and unaudited
financial statements included in the Registration Statement and the Prospectus.


                                       -7-


<PAGE>

               (j) The Company and the Subsidiary each has filed with the
appropriate federal, state and local governmental agencies, and all appropriate
foreign countries and political subdivisions thereof, all tax returns, including
franchise tax returns, which are required to be filed or has duly obtained
extensions of time for the filing thereof and has paid all taxes shown on such
returns and all assessments received by it to the extent that the same have
become due; and the provisions for income taxes payable, if any, shown on the
financial statements filed with or as part of the Registration Statement are
sufficient for all accrued and unpaid foreign and domestic taxes, whether or not
disputed, and for all periods to and including the dates of such financial
statements. Except as disclosed in writing to the Underwriter, neither the
Company nor the Subsidiary has executed or filed with any taxing authority,
foreign or domestic, any agreement extending the period for assessment or
collection of any income taxes and is not a party to any pending action or
proceeding by any foreign or domestic governmental agency for assessment or
collection of taxes; and no claims for assessment or collection of taxes have
been asserted against the Company or the Subsidiary.

               (k) The outstanding Common Shares, the outstanding shares of
Series B Preferred Stock, par value $.01 per share of the Company (the "Series B
Preferred Shares") and outstanding options and warrants to purchase Common
Shares have been duly authorized and validly issued. The outstanding Common
Shares and Series B Preferred Shares are fully paid and nonassessable. The
Company has reserved an aggregate of [562,836] shares of Series C Preferred
Stock, par value $.01 per share of the Company (the "Series C Preferred Shares")
for issuance upon the conversion of [$2,954,888] principal amount of outstanding
indebtedness, plus interest, on the Closing Date. Upon issuance, the Series C
Preferred Shares will be duly authorized, validly issued, fully paid and
nonassessable. The outstanding options and warrants to purchase Common Shares
constitute the valid and binding obligations of the Company, enforceable in
accordance with their terms. None of the outstanding Common Shares or Series B
Preferred Shares or options or warrants to purchase Common Shares has been
issued in violation of the preemptive rights of any shareholder of the Company.
The issuance of the Series C Preferred Shares on the Closing Date will not
violate the preemptive rights of any shareholder of the Company. None of the
holders of the outstanding Common Shares or Series B Preferred Shares is subject
to personal liability solely by reason of being such a holder. Upon issuance of
the Series C Preferred Shares, none of the holders of such shares will be
subject to personal liability solely by reason of being such a holder. Upon
conversion of the outstanding Series B Preferred Shares into Common Shares on
the

                                       -8-

<PAGE>

Closing Date, such shares will be duly authorized, validly issued, fully paid
and non-assessable, and none of the holders thereof will be subject to personal
liability solely by reason of being such a holder. The Company has reserved
sufficient number of Common Shares for future issuance upon the conversion of
the Series C Preferred Shares. Upon conversion of the Series C Preferred Shares
into Common Shares, such shares will be duly authorized, validly issued, fully
paid and non-assessable, and none of the holders thereof will be subject to
personal liability solely by reason of being such a holder. The offers and sales
of the outstanding Common Shares and Series B Preferred Shares and outstanding
options and warrants to purchase Common Shares were at all relevant times, and
the offer and sale of the Series C Preferred Shares on the Closing Date will be,
either registered under the Act and the applicable state securities or Blue Sky
laws or exempt from such registration requirements. The authorized Common
Shares, Series B Preferred Shares and Series C Preferred Shares and outstanding
options and warrants to purchase Common Shares conform to the descriptions
thereof contained in the Registration Statement and Prospectus. Except as set
forth in the Registration Statement and the Prospectus, on the Effective Date
and the Closing Date, there will be no outstanding options or warrants for the
purchase of, or other outstanding rights to purchase, Common Shares or
securities convertible into Common Shares.

               (l) No securities of the Company have been sold by the Company or
by or on behalf of, or for the benefit of, any person or persons controlling,
controlled by, or under common control with the Company within the three years
prior to the date hereof, except as disclosed in the Registration Statement.

               (m) The issuance and sale of the Shares have been duly authorized
and, when the Shares have been issued and duly delivered against payment
therefor as contemplated by this Agreement, the Shares will be validly issued,
fully paid and nonassessable, and the holders thereof will not be subject to
personal liability solely by reason of being such holders. The Shares will not
be subject to preemptive rights of any shareholder of the Company.

               (n) The issuance and sale of the Common Shares issuable upon
exercise of the Underwriter's Warrants have been duly authorized and, when such
Common Shares have been duly delivered against payment therefor, as contemplated
by the Underwriter's Warrant Agreement, such Common Shares will be validly
issued, fully paid and nonassessable. Holders of Common Shares issuable upon the
exercise of the Underwriter's Warrants will not be subject to personal liability
solely by reason of being such holders. Neither the Underwriter's Warrants nor
the

                                     -9-

<PAGE>

Common Shares issuable upon exercise thereof will be subject to preemptive
rights of any shareholder of the Company. The Common Shares issuable upon
exercise of the Underwriter's Warrants have been duly reserved for issuance upon
exercise of the Underwriter's Warrants in accordance with the provisions of the
Underwriter's Warrant Agreement. The Underwriter's Warrants conform to the
descriptions thereof contained in the Registration Statement and the Prospectus.

               (o) Neither the Company nor the Subsidiary is in violation of, or
in default under, (i) any term or provision of its Certificate of Incorporation
or By-Laws, each as amended; (ii) any material term or provision or any
financial covenants of any indenture, mortgage, contract, commitment or other
agreement or instrument to which it is a party or by which it or any of its
property or business is or may be bound or affected; or (iii) any existing
applicable law, rule, regulation, judgment, order or decree of any governmental
agency or court, domestic or foreign, having jurisdiction over the Company or
the Subsidiary or any of the Company's or the Subsidiary's properties or
business. Each of the Company and the Subsidiary owns, possesses or has obtained
all governmental and other (including those obtainable from third parties)
Permits, necessary to own or lease, as the case may be, and to operate its
properties, whether tangible or intangible, and to conduct the business and
operations of the Company and the Subsidiary as presently conducted, and all
such Permits are outstanding and in good standing, and there are no proceedings
pending or, to the best of the Company's knowledge, threatened, or any basis
therefor, seeking to cancel, terminate or limit such Permits.

               (p) Except as set forth in the Prospectus, there are no claims,
actions, suits, proceedings, arbitrations, investigations or inquiries before
any governmental agency, court or tribunal, domestic or foreign, or before any
private arbitration tribunal, pending, or, to the best of the Company's
knowledge, threatened against the Company or the Subsidiary or involving the
Company's or the Subsidiary's properties or business which, if determined
adversely to the Company or the Subsidiary, would, individually or in the
aggregate, result in any material adverse change in the financial position,
shareholders' equity, results of operations, properties, business, management or
affairs or business prospects of the Company or the Subsidiary or which question
the validity of the capital stock of the Company or this Agreement or of any
action taken or to be taken by the Company pursuant to, or in connection with,
this Agreement; nor, to the best of the Company's knowledge, is there any basis
for any such claim, action, suit, proceeding, arbitration, investigation or
inquiry. There are no outstanding orders, judgments or decrees of any court,


                                      -10-

<PAGE>

governmental agency or other tribunal naming the Company or the Subsidiary and
enjoining the Company or the Subsidiary from taking, or requiring the Company or
the Subsidiary to take, any action, or to which the Company or the Subsidiary or
the Company's or the Subsidiary's properties or business is bound or subject.

               (q) Neither the Company nor any of its affiliates has incurred
any liability for any finder's fees or similar payments in connection with the
transactions herein contemplated.

               (r) Each of the Company and the Subsidiary owns or possesses
adequate and enforceable rights to use all patents, patent applications,
trademarks, service marks, copyrights, rights, trade secrets, confidential
information, processes and formulations used or proposed to be used in the
conduct of its business as described in the Prospectus (collectively the
"Intangibles"); to the best of the Company's knowledge, neither the Company nor
the Subsidiary has infringed nor is infringing upon the rights of others with
respect to the Intangibles; and neither the Company nor the Subsidiary has
received any notice of conflict with the asserted rights of others with respect
to the Intangibles which could, singly or in the aggregate, materially adversely
affect its business as presently conducted or the prospects, financial condition
or results of operations of the Company or the Subsidiary, and the Company knows
of no basis therefor; and, to the best of the Company's knowledge, no others
have infringed upon the Intangibles of the Company or the Subsidiary.

               (s) Since the respective dates as of which information is given
in the Registration Statement and the Prospectus and the Company's latest
financial statements, except as set forth in or contemplated by the Registration
Statement or the Prospectus, neither the Company nor the Subsidiary has incurred
any material liability or obligation, direct or contingent, or entered into any
material transaction, whether or not incurred in the ordinary course of
business, or has sustained any material loss or interference with its business
from fire, storm, explosion, flood or other casualty, whether or not covered by
insurance, or from any labor dispute or court or governmental action, order or
decree; and since the respective dates as of which information is given in the
Registration Statement and the Prospectus, there have not been, and prior to the
Closing Date referred to below there will not be, any changes in the capital
stock or any material increases in the long-term debt of the Company or the
Subsidiary or any material adverse change in or affecting the general affairs,
management, financial condition, shareholders' equity, results of operations or
prospects of the

                                      -11-

<PAGE>

Company or the Subsidiary, otherwise than as set forth or contemplated in the
Prospectus.

               (t) Neither the Company nor the Subsidiary owns any real
property. Each of the Company and the Subsidiary has good title to all personal
property (tangible and intangible) owned by it, free and clear of all security
interests, charges, mortgages, liens, encumbrances and defects, except such as
are described in the Registration Statement and Prospectus or such as do not
materially affect the value or transferability of such property and do not
interfere with the use of such property made, or proposed to be made, by the
Company or the Subsidiary. The leases, licenses or other contracts or
instruments under which the Company or the Subsidiary leases, holds or is
entitled to use any property, real or personal, are valid, subsisting and
enforceable only with such exceptions as are not material and do not interfere
with the use of such property made, or proposed to be made, by the Company or
the Subsidiary, and all rentals, royalties or other payments accruing thereunder
which became due prior to the date of this Agreement have been duly paid, and
neither the Company nor the Subsidiary, nor, to the best of the Company's
knowledge, any other party is in default thereunder and, to the best of the
Company's knowledge, no event has occurred which, with the passage of time or
the giving of notice, or both, would constitute a default thereunder. Neither
the Company nor the Subsidiary has received notice of any violation of any
applicable law, ordinance, regulation, order or requirement relating to its
owned or leased properties. Each of the Company and the Subsidiary has
adequately insured its properties against loss or damage by fire or other
casualty and maintains, in adequate amounts, such other insurance as is usually
maintained by companies engaged in the same or similar business located in its
geographic area.

               (u) Each contract or other instrument (however characterized or
described) to which the Company or the Subsidiary is a party or by which their
properties or business is or may be bound or affected and to which reference is
made in the Prospectus has been duly and validly executed, is in full force and
effect in all material respects and is enforceable against the parties thereto
in accordance with its terms, and none of such contracts or instruments has been
assigned by the Company or the Subsidiary, and neither the Company nor the
Subsidiary, nor, to the best of the Company's knowledge, any other party, is in
default thereunder and, to the best of the Company's knowledge, no event has
occurred which, with the lapse of time or the giving of notice, or both, would
constitute a default thereunder.

               None of the material provisions of such contracts or instruments
violates any existing applicable law, rule,

                                      -12-

<PAGE>

regulation, judgment, order or decree of any governmental agency or court having
jurisdiction over the Company or the Subsidiary or any of their assets or
business.

               (v) The employment, consulting and confidentiality agreements
between the Company or the Subsidiary and their respective officers, employees
and consultants, described in the Registration Statement, are binding and
enforceable obligations upon the respective parties thereto in accordance with
their respective terms, except as such enforceability may be limited by
applicable bankruptcy, insolvency, moratorium or other similar laws or
arrangements affecting creditors' rights generally and subject to principles of
equity.

               (w) Except as set forth in the Prospectus, the Company has no
employee benefit plans (including, without limitation, profit sharing and
welfare benefit plans) or deferred compensation arrangements that are subject to
the provisions of the Employee Retirement Income Security Act of 1974.

               (x) To the best of the Company's knowledge, no labor problem
exists with any of the Company's or the Subsidiary's employees or is imminent
which could adversely affect the Company or the Subsidiary.

               (y) The Company has not, directly or indirectly, at any time (i)
made any contributions to any candidate for political office, or failed to
disclose fully any such contribution in violation of law or (ii) made any
payment to any state, federal or foreign governmental officer or official, or
other person charged with similar public or quasi-public duties, other than
payments or contributions required or allowed by applicable law. The Company's
internal accounting controls and procedures are sufficient to cause the Company
to comply in all material respects with the Foreign Corrupt Practices Act of
1977, as amended.

               (z) The Shares have been approved for listing on the Nasdaq
SmallCap Market.

               (aa) The Company has provided to Tenzer Greenblatt LLP, counsel
to the Underwriter ("Underwriter's Counsel"), all agreements, certificates,
correspondence and other items, documents and information requested pursuant to
the Due Diligence List of Bizar Martin & Taub, LLP, counsel for the Company
("Company Counsel"), dated May 5, 1998 and the supplemental requests of
Underwriter's Counsel dated June 26, 1998 and October 2, 1998.


                                      -13-

<PAGE>

               Any certificate signed by an officer of the Company and delivered
to the Underwriter or to Underwriter's Counsel shall be deemed to be a
representation and warranty by the Company to the Underwriter as to the matters
covered thereby.

          5. Certain Covenants of the Company. The Company covenants with the
Underwriter as follows:

               (a) The Company will not at any time, whether before the
Effective Date or thereafter during such period as the Prospectus is required by
law to be delivered in connection with the sales of the Shares by the
Underwriter or a dealer, file or publish any amendment or supplement to the
Registration Statement or Prospectus of which the Underwriter has not been
previously advised and furnished a copy, or to which the Underwriter shall
object in writing.

               (b) The Company will use its best efforts to cause the
Registration Statement to become effective and will advise the Underwriter
immediately, and, if requested by the Underwriter, confirm such advice in
writing, (i) when the Registration Statement, or any post-effective amendment to
the Registration Statement or any supplemented Prospectus is filed with the
Commission; (ii) of the receipt of any comments from the Commission; (iii) of
any request of the Commission for amendment or supplementation of the
Registration Statement or Prospectus or for additional information; and (iv) of
the issuance by the Commission of any stop order suspending the effectiveness of
the Registration Statement or of any order preventing or suspending the use of
any Preliminary Prospectus, or of the suspension of the qualification of the
Shares for offering or sale in any jurisdiction, or of the initiation of any
proceedings for any of such purposes. The Company will use its best efforts to
prevent the issuance of any such stop order or of any order preventing or
suspending such use and to obtain as soon as possible the lifting thereof, if
any such order is issued.

               (c) The Company will deliver to the Underwriter, without charge,
from time to time until the Effective Date, as many copies of each Preliminary
Prospectus as the Underwriter may reasonably request, and the Company hereby
consents to the use of such copies for purposes permitted by the Act. The
Company will deliver to the Underwriter, without charge, as soon as the
Registration Statement becomes effective, and thereafter from time to time as
requested, such number of copies of the Prospectus (as supplemented, if the
Company makes any supplements to the Prospectus) as the Underwriter may
reasonably request upon request. The Company has furnished or will furnish to
the Underwriter two signed copies of the Registration Statement as originally
filed and of all amendments thereto, whether filed before or

                                      -14-

<PAGE>

after the Registration Statement becomes effective, two copies of all exhibits
filed therewith and two signed copies of all consents and certificates of
experts.

               (d) The Company will comply with the Act, the Regulations, the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules
and regulations thereunder so as to permit the continuance of sales of and
dealings in the Offered Shares and in any Optional Shares which may be issued
and sold. If, at any time when a prospectus relating to the Shares is required
to be delivered under the Act, any event occurs as a result of which the
Registration Statement and Prospectus as then amended or supplemented would
include an untrue statement of a material fact or omit to state a material fact
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading, or if it shall be necessary to amend or
supplement the Registration Statement and Prospectus to comply with the Act or
the regulations thereunder, the Company will promptly file with the Commission,
subject to Section 5(a) hereof, an amendment or supplement which will correct
such statement or omission or which will effect such compliance.

               (e) The Company will furnish such proper information as may be
required and otherwise cooperate in qualifying the Shares for offering and sale
under the securities or Blue Sky laws relating to the offering in such
jurisdictions as the Underwriter may reasonably designate, provided that no such
qualification will be required in any jurisdiction where, solely as a result
thereof, the Company would be subject to service of general process or to
taxation or qualification as a foreign corporation doing business in such
jurisdiction.

               (f) The Company will make generally available to its security
holders, in the manner specified in Rule 158(b) under the Act, and deliver to
the Underwriter and Underwriter's Counsel as soon as practicable and in any
event not later than 45 days after the end of its fiscal quarter in which the
first anniversary date of the effective date of the Registration Statement
occurs, an earning statement meeting the requirements of Rule 158(a) under the
Act covering a period of at least 12 consecutive months beginning after the
effective date of the Registration Statement.

               (g) For a period of five years from the Effective Date, the
Company will deliver to the Underwriter and to Underwriter's Counsel on a timely
basis (i) a copy of each report or document, including, without limitation,
reports on Forms 8-K, 10-C, 10-K (or 10-KSB), 10-Q (or 10-QSB) and 10-C and
exhibits thereto, filed or furnished to the Commission, any securities exchange
or the National Association of Securities Dealers, Inc.

                                      -15-

<PAGE>

(the "NASD") on the date each such report or document is so filed or furnished;
(ii) as soon as practicable, copies of any reports or communications (financial
or other) of the Company mailed to its security holders; (iii) as soon as
practicable, a copy of any Schedule 13D, 13G, 14D-1 or 13E-3 received or
prepared by the Company from time to time; (iv) monthly statements setting forth
such information regarding the Company's results of operations and financial
position (including balance sheet, profit and loss statements and data regarding
outstanding purchase orders) as is regularly prepared by management of the
Company; and (v) such additional information concerning the business and
financial condition of the Company as the Underwriter may from time to time
reasonably request and which can be prepared or obtained by the Company without
unreasonable effort or expense. The Company will furnish to its shareholders
annual reports containing audited financial statements and such other periodic
reports as it may determine to be appropriate or as may be required by law.

               (h) Neither the Company nor any person that controls, is
controlled by or is under common control with the Company will take any action
designed to or which might be reasonably expected to cause or result in the
stabilization or manipulation of the price of the Common Shares.

               (i) If the transactions contemplated by this Agreement are
consummated, the Underwriter shall retain the $50,000 previously paid to it, and
the Company will pay or cause to be paid the following: all costs and expenses
incident to the performance of the obligations of the Company under this
Agreement, including, but not limited to, the fees and expenses of accountants
and counsel for the Company; the preparation, printing, mailing and filing of
the Registration Statement (including financial statements and exhibits),
Preliminary Prospectuses and the Prospectus, and any amendments or supplements
thereto; the printing and mailing of the Selected Dealer Agreement, the issuance
and delivery of the Shares to the Underwriter; all taxes, if any, on the
issuance of the Shares; the fees, expenses and other costs of qualifying the
Shares for sale under the Blue Sky or securities laws of those states in which
the Shares are to be offered or sold, including fees and disbursements of
counsel in connection therewith, and including those of such local counsel as
may have been retained for such purpose; the filing fees incident to securing
any required review by the NASD and either the Boston Stock Exchange or Pacific
Stock Exchange; the cost of printing and mailing the "Blue Sky Survey," the cost
of furnishing to the Underwriter copies of the Registration Statement,
Preliminary Prospectuses and the Prospectus as herein provided; the costs (up to
$12,000) of placing "tombstone advertisements" in any publications which may be
selected by the Underwriter; and all other costs and expenses

                                  -16-
 
<PAGE>

incident to the performance of the Company's obligations hereunder which are not
otherwise specifically provided for in this Section 5(i).

               In addition, at the Closing Date or the Option Closing Date, as
the case may be, the Underwriter will deduct from the payment for the Offered
Shares or any Optional Shares three percent (3%) of the gross proceeds of the
offering (less the sum of $50,000 previously paid to the Underwriter), as
payment for the Underwriter's nonaccountable expense allowance relating to the
transactions contemplated hereby, which amount will include the fees and
expenses of Underwriter's Counsel (other than the fees and expenses of
Underwriter's Counsel relating to Blue Sky qualifications and registrations,
which, as provided for above, shall be in addition to the three percent (3%)
nonaccountable expense allowance and shall be payable directly by the Company to
Underwriter's Counsel on or prior to the Closing Date). Prior to the Closing
Date, Underwriter's Counsel will deliver a copy of the "Blue Sky Survey" to the
Company.

               (j) If the transactions contemplated by this Agreement or related
hereto are not consummated because the Company decides not to proceed with the
offering for any reason or because the Underwriter decides not to proceed with
the offering as a result of a breach by the Company of its representations,
warranties or covenants in this Agreement or as a result of material adverse
changes in the affairs of the Company, then the Company will be obligated to
reimburse the Underwriter for its accountable out-of-pocket expenses up to the
sum of $75,000, inclusive of amounts theretofore paid to the Underwriter by the
Company. In all cases other than those set forth in the preceding sentence, if
the Company or the Underwriter decides not to proceed with the offering for any
other reason, the Company will only be obligated to reimburse the Underwriter
for its accountable expenses up to $50,000, inclusive of amounts theretofore
paid to the Underwriter by the Company. In no event, however, will the
Underwriter, in the event the offering is terminated, be entitled to retain or
receive more than an amount equal to its actual accountable out-of-pocket
expenses.

               (k) The Company intends to apply the net proceeds from the sale
of the Shares for the purposes set forth in the Prospectus. No portion of the
net proceeds from the sale of the Shares will be used to repay any indebtedness
other than (i) $575,000 principal amount of indebtedness plus accrued interest
thereon and (ii) up to $95,000 of indebtedness to be assumed by the Company in
connection with the acquisition of CommHome Systems Corp., provided that [,
except as described in the

                                      -17-

<PAGE>

Registration Statement,] none of such amounts described in (i) and (ii) of this
Section 5(k) will be repaid to any person or entity that is, or will be prior to
the Closing Date, an officer, director or securityholder beneficially owning
five percent (5%) or more of the Common Shares (a "Principal Securityholder"),
or any affiliate of any such person or entity. The Company will file with the
Commission all required reports in accordance with the provisions of Rule 463
promulgated under the Act and will provide a copy of each such report to the
Underwriter and its counsel.

               (l) During the period of twelve (12) months from the Effective
Date (the "Initial Lock-up Period"), neither the Company nor any of its
officers, directors or security holders will offer for sale or sell or otherwise
dispose of, directly or indirectly, any securities of the Company, in any manner
whatsoever, other than by a private sale or gift in connection with which the
transferee agrees to be bound by the terms of this agreement, whether pursuant
to Rule 144 of the Regulations or otherwise, and no holders of registration
rights relating to securities of the Company will exercise any such registration
rights, in either case, without the prior written consent of the Underwriter. In
addition, during the twelve (12) month period following the Initial Lock-up
Period, no officer, director or Principal Securityholder will sell, transfer or
otherwise dispose of any of its Common Shares during any three-month period in
excess of the amount that such person would be allowed to sell if it were deemed
an "affiliate" of the Company and its shares were deemed "restricted," as those
terms are defined in Rule 144 promulgated under the Act, other than by a private
sale or gift in connection with which the transferee agrees to be bound by the
terms of this agreement, without the prior written consent of the Underwriter.

               (m) The Company will not file any registration statement relating
to the offer or sale of any of the Company's securities, including any
registration statement on Form S-8, during the twelve (12) months from the
Effective Date, without the Underwriter's prior written consent.

               (n) The Company maintains and will continue to maintain a system
of internal accounting controls sufficient to provide reasonable assurances
that: (i) transactions are executed in accordance with management's general or
specific authorization; (ii) transactions are recorded as necessary in order to
permit preparation of financial statements in accordance with generally accepted
accounting principles and to maintain accountability for assets; (iii) access to
assets is permitted only in accordance with management's general or specific
authorization; and (iv) the recorded accountability for assets is compared with

                                      -18-

<PAGE>

existing assets at reasonable intervals and appropriate action is taken with
respect to any differences.

               (o) The Company will use its best efforts to maintain the listing
of the Shares on the Nasdaq SmallCap Market and will, if so qualified, list the
Shares, and maintain such listing for so long as qualified, on the Nasdaq
National Market System.

               (p) The Company will, concurrently with the Effective Date,
register the class of equity securities of which the Shares are a part under
Section 12(g) of the Exchange Act and the Company will maintain such
registration for a minimum of five (5) years from the Effective Date.

               (q) Subject to the sale of the Offered Shares, the Underwriter
and its successors will have the right to designate a nominee for election, at
its or their option, either as a member of or a non-voting advisor to the Board
of Directors of the Company (which Board, during such period, shall be comprised
of at least five (5) persons, a majority of the members of which Board must,
during such period, be persons not otherwise affiliated with the Company, its
management or its founders), and the Company will use its best efforts to cause
such nominee to be elected and continued in office as a director of the Company
or as such advisor until the expiration of five (5) years from the Effective
Date. Except to the extent waived by the Underwriter, each of the Company's
current officers, directors and shareholders agrees to vote all of the Common
Shares owned by such person or entity so as to elect and continue in office such
nominee of the Underwriter. Following the election of such nominee as a director
or advisor, such person shall receive no more or less compensation than is paid
to other non-officer directors of the Company for attendance at meetings of the
Board of Directors of the Company and shall be entitled to receive reimbursement
for all reasonable costs incurred in attending such meetings including, but not
limited to, food, lodging and transportation. The Company agrees to indemnify
and hold such director or advisor harmless, to the maximum extent permitted by
law, against any and all claims, actions, awards and judgments arising out of
his service as a director or advisor and to maintain a liability insurance
policy affording coverage for the acts of its officers and directors, to include
such director or advisor as an insured under such policy. The rights and
benefits of such indemnification and the benefits of such insurance shall, to
the extent possible, extend to the Underwriter insofar as it may be or may be
alleged to be responsible for such director or advisor.


                                      -19-

<PAGE>

                  If the Underwriter does not exercise its option to designate a
member of or advisor to the Company's Board of Directors, the Underwriter shall
nonetheless have the right to send a representative (who need not be the same
individual from meeting to meeting) to observe each meeting of the Board of
Directors. The Company agrees to give the Underwriter notice of each such
meeting and to provide the Underwriter with an agenda and minutes of the meeting
no later than it gives such notice and provides such items to the directors.

               (r) The Company shall retain a transfer agent for the Common
Shares, reasonably acceptable to the Underwriter, for a period of five (5) years
from the Effective Date. In addition, for a period of five (5) years from the
Effective Date, the Company, at its own expense, shall cause such transfer agent
to provide the Underwriter, if so requested in writing, with copies of the
Company's daily transfer sheets, and, when requested by the Underwriter, a
current list of the Company's securityholders, including a list of the
beneficial owners of securities held by a depository trust company and other
nominees.

               (s) The Company hereby agrees, at its sole cost and expense, to
supply and deliver to the Underwriter and Underwriter's Counsel, within a
reasonable period from the date hereof, four bound volumes, including the
Registration Statement, as amended or supplemented, all exhibits to the
Registration Statement, the Prospectus and all other underwriting documents.

               (t) The Company shall, as of the date hereof, have applied for
listing in Standard & Poor's Corporation Records Service (including annual
report information) or Moody's Industrial Manual (Moody's OTC Industrial Manual
not being sufficient for these purposes) and shall use its best efforts to have
the Company listed in such manual and shall maintain such listing for a period
of five years from the Effective Date.

               (u) For a period of five (5) years from the Effective Date, the
Company shall provide the Underwriter, on a not less than annual basis, with
internal forecasts setting forth projected results of operations for each
quarterly and annual period in the two (2) fiscal years following the respective
dates of such forecasts. Such forecasts shall be provided to the Underwriter
more frequently than annually if prepared more frequently by management, and
revised forecasts shall be prepared and provided to the Underwriter when
required to reflect more current information, revised assumptions or actual
results that differ materially from those set forth in the forecasts.

               (v) For a period of five (5) years from the Effective Date, or
until such earlier time as the Common Shares

                                      -20-

<PAGE>

are listed on the New York Stock Exchange or the American Stock Exchange, the
Company shall cause its legal counsel to provide the Underwriter with a list, to
be updated at least annually, of those states in which the Common Shares may be
traded in non- issuer transactions under the Blue Sky laws of the 50 states.

               (w) For a period of five (5) years from the Effective Date, the
Company shall continue to retain Richard A. Eisner & Company, LLP (or such other
nationally recognized accounting firm acceptable to the Underwriter) as the
Company's independent public accountants.

               (x) For a period of five (5) years from the Effective Date, the
Company, at its expense, shall cause its then independent certified public
accountants, as described in Section 5(w) above, to review (but not audit) the
Company's financial statements for each of the first three fiscal quarters prior
to the announcement of quarterly financial information, the filing of the
Company's 10-Q (or 10-QSB) quarterly report (or other equivalent report) and the
mailing of quarterly financial information to shareholders.

               (y) For a period of twenty-five (25) days from the Effective
Date, the Company will not issue press releases or engage in any other publicity
without the Underwriter's prior written consent, other than normal and customary
releases issued in the ordinary course of the Company's business or those
releases required by law.

               (z) The Company will not increase or authorize an increase in the
compensation of its five (5) most highly paid employees in excess of the
compensation paid to such employees as of the Effective Date, without the prior
written consent of the Underwriter, for a period of three (3) years from the
Effective Date.

               (aa) For a period of five (5) years from the Effective Date, the
Company will promptly submit to the Underwriter copies of accountant's
management reports and similar correspondence between the Company's accountants
and the Company.

               (ab) For a period of three (3) years from the Effective Date, the
Company will not offer or sell any of its securities (i) pursuant to Regulation
S promulgated under the Act or which are convertible or exercisable into Common
Shares at a price which may be adjusted from time to time based on the future
market price of the Common Shares, without the prior written consent of the
Underwriter, or (ii) at a discount to market or in a discounted transaction
(other than as described in clause (i)

                                      -21-

<PAGE>

above), without the prior written consent of the Underwriter, which shall not be
unreasonably withheld.

               (ac) For a period of three (3) years from the Effective Date, the
Company will provide to the Underwriter ten days' written notice prior to any
issuance by the Company or its subsidiaries of any equity securities or
securities exchangeable for or convertible into equity securities of the
Company, except for (i) Common Shares issuable upon exercise of currently
outstanding options and warrants or conversion of currently outstanding
convertible securities and (ii) options (and shares issuable upon exercise of
such options) available for future grant pursuant to any stock option plan in
effect on the Effective Date or a future plan approved by the Company's
shareholders.

               (ad) For a period of five (5) years from the Effective Date, the
Company will cause its Board of Directors to meet, either in person or
telephonically, a minimum of four (4) times per year and will hold a
shareholder's meeting at least once per annum.

               (ae) Prior to the Effective Date, the Company shall have obtained
directors' and officers' insurance naming the Underwriter as an additional
insured party, in an amount equal to twenty-five percent (25%) of the gross
proceeds of the offering, and the Company will maintain such insurance for a
period of at least three (3) years from the Closing Date.

          6. Conditions of the Underwriter's Obligation to Purchase Shares from
the Company. The obligation of the Underwriter to purchase and pay for the
Offered Shares which it has agreed to purchase from the Company is subject (as
of the date hereof and the Closing Date) to the accuracy of and compliance in
all material respects with the representations and warranties of the Company
herein, to the accuracy of the statements of the Company or its officers made
pursuant hereto, to the performance in all material respects by the Company of
its obligations hereunder, and to the following additional conditions:

               (a) The Registration Statement will have become effective not 
later than __.M., New York City time, on the date hereof, or at such later 
time or on such later date as the Underwriter may agree to in writing; prior 
to the Closing Date, no stop order suspending the effectiveness of the 
Registration Statement will have been issued and no proceedings for that 
purpose will have been initiated or will be pending or, to the best of the 
Underwriter's or the Company's knowledge, will be contemplated by the 
Commission; and any request on the part of

                                      -22-

<PAGE>

the Commission for additional information will have been complied with to the
satisfaction of Underwriter's Counsel.

               (b) At the time that this Agreement is executed and at the
Closing Date, there will have been delivered to the Underwriter a signed opinion
of Company Counsel, dated as of the date hereof or the Closing Date, as the case
may be (and any other opinions of counsel referred to in such opinion of Company
Counsel or relied upon by Company Counsel in rendering their opinion),
reasonably satisfactory to Underwriter's Counsel, to the effect that:

                    (i) The Company is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware, with full
power and authority, corporate and other, and with all Permits necessary to own
or lease, as the case may be, and operate its properties, whether tangible or
intangible, and to conduct its business as described in the Registration
Statement. The Subsidiary is a corporation duly organized, validly existing and
in good standing under the laws of the state of Delaware, with full power and
authority, corporate and other, to own or lease, as the case may be, and operate
its properties, whether tangible or intangible, and to conduct its business as
described in the Registration Statement. Each of the Company and the Subsidiary
is duly qualified to do business as a foreign corporation and is in good
standing in all jurisdictions wherein such qualification is necessary, except in
such jurisdictions where the failure so to qualify or be in good standing would
not have a material adverse effect on the financial condition, results of
operations, business or properties of the Company and the Subsidiary taken as a
whole.

                         The Company owns 100% of the issued and outstanding
shares of capital stock of the Subsidiary, and such shares are free and clear of
any security interests, liens, encumbrances, claims and charges, and all of such
shares have been duly authorized and validly issued and are fully paid and
nonassessable. There are no options or warrants for the purchase of, or other
rights to purchase, or outstanding securities convertible into or exchangeable
for, any capital stock or other securities of the Subsidiary.

                    (ii) The Company has full power and authority, corporate and
other, to execute, deliver and perform this Agreement and the Underwriter's
Warrant Agreement and to consummate the transactions contemplated hereby and
thereby. The execution, delivery and performance of this Agreement and the
Underwriter's Warrant Agreement by the Company, the consummation by the Company
of the transactions herein and therein contemplated and the compliance by the
Company with the terms of

                                      -23-

<PAGE>

this Agreement and the Underwriter's Warrant Agreement have been duly authorized
by all necessary corporate action, and this Agreement has been duly executed and
delivered by the Company. This Agreement is (assuming for the purposes of this
opinion that it is valid and binding upon the other party thereto) and, when
executed and delivered by the Company on the Closing Date, the Underwriter's
Warrant Agreement will be, valid and binding obligations of the Company,
enforceable in accordance with their respective terms, subject, as to
enforcement of remedies, to applicable bankruptcy, insolvency, reorganization,
moratorium and other laws affecting the rights of creditors generally and the
discretion of courts in granting equitable remedies and except that
enforceability of the indemnification provisions set forth in Section 7 hereof
and the contribution provisions set forth in Section 8 hereof may be limited by
the federal securities laws or public policy underlying such laws.

                    (iii) The execution, delivery and performance of this
Agreement and the Underwriter's Warrant Agreement by the Company, the
consummation by the Company of the transactions herein and therein contemplated
and the compliance by the Company with the terms of this Agreement and the
Underwriter's Warrant Agreement do not, and will not, with or without the giving
of notice or the lapse of time, or both, (A) result in a violation of the
Certificate of Incorporation or ByLaws, each as amended, of the Company or the
Subsidiary, (B) result in a breach of or conflict with any terms or provisions
of, or constitute a default under, or result in the modification or termination
of, or result in the creation or imposition of any lien, security interest,
charge or encumbrance upon any of the properties or assets of the Company or the
Subsidiary pursuant to any indenture, mortgage, note, contract, commitment or
other material agreement or instrument to which the Company or the Subsidiary is
a party or by which the Company or the Subsidiary or any of the Company's or the
Subsidiary's properties or assets are or may be bound or affected; (C) violate
any existing applicable law, rule, regulation, judgment, order or decree of any
governmental agency or court, domestic or foreign, having jurisdiction over the
Company or the Subsidiary or any of the Company's or the Subsidiary's properties
or business; or (D) have any effect on any Permit necessary for the Company or
the Subsidiary to own or lease and operate its properties or conduct its
business or the ability of the Company or the Subsidiary to make use thereof.

                    (iv) To the best of Company Counsel's knowledge, no Permits
of any court or governmental agency or body (other than under the Act, the
Regulations and applicable state securities or Blue Sky laws) are required for
the valid authorization, issuance, sale and delivery of the Shares or the

                                      -24-

<PAGE>

Underwriter's Warrants to the Underwriter, and the consummation by the Company
of the transactions contemplated by this Agreement or the Underwriter's Warrant
Agreement.

                    (v) The Registration Statement has become effective under
the Act; to the best of Company Counsel's knowledge, no stop order suspending
the effectiveness of the Registration Statement has been issued, and no
proceedings for that purpose have been instituted or are pending, threatened or
contemplated under the Act or applicable state securities laws.

                    (vi) The Registration Statement and the Prospectus, as of
the Effective Date, and each amendment or supplement thereto as of its effective
or issue date (except for the financial statements and other financial data
included therein or omitted therefrom, as to which Company Counsel need not
express an opinion) comply as to form in all material respects with the
requirements of the Act and Regulations and the conditions for use of a
registration statement on Form SB-2 have been satisfied by the Company.

                    (vii) The descriptions in the Registration Statement and the
Prospectus of statutes, regulations, government classifications, contracts and
other documents (including opinions of such counsel); and the response to Item
13 of Form SB-2 have been reviewed by Company Counsel, and, based upon such
review, are accurate in all material respects and present fairly the information
required to be disclosed, and there are no material statutes, regulations or
government classifications, or, to the best of Company Counsel's knowledge,
material contracts or documents, of a character required to be described in the
Registration Statement or the Prospectus or to be filed as exhibits to the
Registration Statement, which are not so described or filed as required.

                    None of the material provisions of the contracts or
instruments described above violates any existing applicable law, rule,
regulation, judgment, order or decree of any governmental agency or court having
jurisdiction over the Company or the Subsidiary or any of their assets or
business.

                    (viii) The outstanding Common Shares and outstanding options
and warrants to purchase Common Shares have been duly authorized and validly
issued. The outstanding Common Shares are fully paid and nonassessable. The
outstanding options and warrants to purchase Common Shares constitute the valid
and binding obligations of the Company, enforceable in accordance with their
terms. None of the outstanding Common Shares or options or warrants to purchase
Common Shares has been issued in violation of the preemptive rights of any
shareholder of the

                                      -25-

<PAGE>

Company. None of the holders of the outstanding Common Shares is subject to
personal liability solely by reason of being such a holder. The offers and sales
of the outstanding Common Shares and outstanding options and warrants to
purchase Common Shares were at all relevant times either registered under the
Act and the applicable state securities or Blue Sky laws or exempt from such
registration requirements. The authorized Common Shares and outstanding options
and warrants to purchase Common Shares conform to the descriptions thereof
contained in the Registration Statement and Prospectus. To the best of Company
Counsel's knowledge, except as set forth in the Prospectus, no holders of any of
the Company's securities has any rights, "demand," "piggyback" or otherwise, to
have such securities registered under the Act.

                    (ix) The issuance and sale of the Shares have been duly
authorized and, when the Shares have been issued and duly delivered against
payment therefor as contemplated by this Agreement, the Shares will be validly
issued, fully paid and nonassessable, and the holders thereof will not be
subject to personal liability solely by reason of being such holders. The Shares
are not subject to preemptive rights of any shareholder of the Company. The
certificates representing the Shares are in proper legal form.

                    (x) The issuance and sale of the Common Shares issuable upon
exercise of the Underwriter's Warrants have been duly authorized and, when such
Common Shares have been duly delivered against payment therefor, as contemplated
by the Underwriter's Warrant Agreement, such Common Shares will be validly
issued, fully paid and nonassessable. Holders of Common Shares issuable upon
exercise of the Underwriter's Warrants will not be subject to personal liability
solely by reason of being such holders. Neither the Underwriter's Warrants nor
the Common Shares issuable upon exercise thereof will be subject to preemptive
rights of any shareholder of the Company. The Warrant Shares issuable upon
exercise of the Underwriter's Warrants have been duly reserved for issuance upon
exercise of the Underwriter's Warrants in accordance with the provisions of the
Underwriter's Warrant Agreement. The Underwriter's Warrants conform to the
descriptions thereof in the Registration Statement and Prospectus.

                    (xi) Upon delivery of the Offered Shares to the Underwriter
against payment therefor as provided in this Agreement, the Underwriter
(assuming it is a bona fide purchaser within the meaning of the Uniform
Commercial Code) will acquire good title to the Offered Shares, free and clear
of all liens, encumbrances, equities, security interests and claims.

                                      -26-

<PAGE>

                    (xii) Assuming that the Underwriter exercises the
over-allotment option to purchase any of the Optional Shares and makes payment
therefor in accordance with the terms of this Agreement, upon delivery of the
Optional Shares to the Underwriter hereunder, the Underwriter (assuming it is a
bona fide purchaser within the meaning of the Uniform Commercial Code) will
acquire good title to such Optional Shares, free and clear of any liens,
encumbrances, equities, security interests and claims.

                    (xiii) To the best of Company Counsel's knowledge, there are
no claims, actions, suits, proceedings, arbitrations, investigations or
inquiries before any governmental agency, court or tribunal, foreign or
domestic, or before any private arbitration tribunal, pending or threatened
against the Company or the Subsidiary or involving the Company's or the
Subsidiary's properties or business, other than as described in the Prospectus,
such description being accurate, and other than litigation incident to the kind
of business conducted by the Company which, individually and in the aggregate,
is not material.

                    (xiv) Company Counsel has participated in reviews and
discussions in connection with the preparation of the Registration Statement and
the Prospectus, and in the course of such reviews and discussions and such other
investigation as Company Counsel deemed necessary, no facts came to its
attention which lead it to believe that (A) the Registration Statement (except
as to the financial statements and other financial data contained therein, as to
which Company Counsel need not express an opinion), on the Effective Date,
contained any untrue statement of a material fact required to be stated therein
or omitted to state any material fact required to be stated therein or necessary
to make the statements therein, in light of the circumstances under which they
were made, not misleading, or that (B) the Prospectus (except as to the
financial statements and other financial data contained therein, as to which
Company Counsel need not express an opinion) contains any untrue statement of a
material fact or omits to state any material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.

                    In rendering its opinion pursuant to this Section 6(b),
Company Counsel may rely upon the certificates of government officials and
officers of the Company as to matters of fact, provided that Company Counsel
shall state that they have no reason to believe, and do not believe, that they
are not justified in relying upon such opinions or such certificates of
government officials and officers of the Company as to matters of fact, as the
case may be.

                                      -27-

<PAGE>

                    The opinion letter delivered pursuant to this Section 6(b)
shall state that any opinion given therein qualified by the phrase "to the best
of our knowledge" is being given by Company Counsel after due investigation of
the matters therein discussed. Company Counsel shall not be required to state
any opinion as to the Intangibles (as defined below) with respect to Sections
6(b)(i) through 6(b)(xiii) of the opinion letter delivered pursuant to this
Section 6(b).

               (c) At the time that this Agreement is executed and at the
Closing Date, there will have been delivered to the Underwriter a signed opinion
of Cobrin & Gittes, special intellectual property counsel for the Company ("IP
Counsel"), dated as of the date hereof or the Closing Date, as the case may be,
reasonably satisfactory to Underwriter's Counsel, to the effect that:

                    (i) To the best of IP Counsel's knowledge, the Company and
the Subsidiary have not infringed and are not infringing upon the rights of
others with respect to all patents, patent applications, trademarks, service
marks, copyrights, rights, trade secrets, confidential information, processes
and formulations used or proposed to be used in the conduct of their business as
described in the Prospectus (collectively the "Intangibles"); and, to the best
of IP Counsel's knowledge, neither the Company nor the Subsidiary has received
any notice that it has or may have infringed, is infringing upon or is
conflicting with the asserted rights of others with respect to the Intangibles
which might, singly or in the aggregate, materially adversely affect its
business, results of operations or financial condition, and such counsel is not
aware of any licenses with respect to the Intangibles which are required to be
obtained by the Company or the Subsidiary.

                    (ii) IP Counsel confirms the opinion of IP Counsel dated
June 23, 1997 and addressed to the Company (a copy of which shall be attached
thereto) in all material respects as if such opinion was given on the date
hereof (IP Counsel may restate such opinion in its entirety).

                    In rendering its opinion pursuant to this Section 6(c), IP
Counsel may rely upon the certificates of government officials and officers of
the Company as to matters of fact, provided that IP Counsel shall state that
they have no reason to believe, and do not believe, that they are not justified
in relying upon such opinions or such certificates of government officials and
officers of the Company as to matters of fact, as the case may be.


                                      -28-

<PAGE>

                    The opinion letter delivered pursuant to this Section 6(c)
shall state that any opinion given therein qualified by the phrase "to the best
of our knowledge" is being given by IP Counsel after due investigation of the
matters therein discussed.

               (d) At the Closing Date, there will have been delivered to the
Underwriter a signed opinion of Underwriter's Counsel, dated as of the Closing
Date, to the effect that the opinions delivered pursuant to Sections 6(b) and
6(c) hereof appear on their face to be appropriately responsive to the
requirements of this Agreement, except to the extent waived by the Underwriter,
specifying the same, and with respect to such related matters as the Underwriter
may require.

               (e) At the Closing Date (i) the Registration Statement and the
Prospectus and any amendments or supplements thereto will contain all material
statements which are required to be stated therein in accordance with the Act
and the Regulations and will conform in all material respects to the
requirements of the Act and the Regulations, and neither the Registration
Statement nor the Prospectus nor any amendment or supplement thereto will
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading; (ii)
since the respective dates as of which information is given in the Registration
Statement and the Prospectus, there will not have been any material adverse
change in the financial condition, results of operations or general affairs of
the Company from that set forth or contemplated in the Registration Statement
and the Prospectus, except changes which the Registration Statement and the
Prospectus indicate might occur after the Effective Date; (iii) since the
respective dates as of which information is given in the Registration Statement
and the Prospectus, there shall have been no material transaction, contract or
agreement entered into by the Company, other than in the ordinary course of
business, which would be required to be set forth in the Registration Statement
and the Prospectus, other than as set forth therein; and (iv) no action, suit or
proceeding at law or in equity will be pending or, to the best of the Company's
knowledge, threatened against the Company which is required to be set forth in
the Registration Statement and the Prospectus, other than as set forth therein,
and no proceedings will be pending or, to the best of the Company's knowledge,
threatened against the Company before or by any federal, state or other
commission, board or administrative agency wherein an unfavorable decision,
ruling or finding would materially adversely affect the business, property,
financial condition or results of operations of the Company, other than as set
forth in the Registration Statement and the Prospectus. At

                                      -29-

<PAGE>

the Closing Date, there will be delivered to the Underwriter a certificate
signed by the Chief Executive Officer and Chief Financial Officer or a Vice
President of the Company, dated the Closing Date, evidencing compliance with the
provisions of this Section 6(e) and stating that the representations and
warranties of the Company set forth in Section 4 hereof were accurate and
complete in all material respects when made on the date hereof and are accurate
and complete in all material respects on the Closing Date as if then made; that
the Company has performed all covenants and complied with all conditions
required by this Agreement to be performed or complied with by the Company prior
to or as of the Closing Date; and that, as of the Closing Date, no stop order
suspending the effectiveness of the Registration Statement has been issued and
no proceedings for that purpose have been initiated or, to the best of his
knowledge, are contemplated or threatened. In addition, the Underwriter will
have received such other and further certificates of officers of the Company as
the Underwriter or Underwriter's Counsel may reasonably request.

               (f) At the time that this Agreement is executed and at the
Closing Date, the Underwriter will have received a signed letter from Richard A.
Eisner & Company, LLP, dated the date such letter is to be received by the
Underwriter and addressed to it, confirming that it is a firm of independent
public accountants within the meaning of the Act and Regulations and stating
that: (i) insofar as reported on by them, in their opinion, the financial
statements of the Company included in the Prospectus comply as to form in all
material respects with the applicable accounting requirements of the Act and the
applicable Regulations; (ii) on the basis of procedures and inquiries (not
constituting an examination in accordance with generally accepted auditing
standards) consisting of a review described in SAS No. 71 of the unaudited
interim financial statements of the Company, if any, appearing in the
Registration Statement and the Prospectus and a reading of the latest available
unaudited interim financial statements of the Company, if more recent than that
appearing in the Registration Statement and Prospectus, inquiries of officers of
the Company responsible for financial and accounting matters as to the
transactions and events subsequent to the date of the latest audited financial
statements of the Company, and a reading of the minutes of meetings of the
shareholders, the Board of Directors of the Company and any committees of the
Board of Directors, as set forth in the minute books of the Company, nothing has
come to their attention which, in their judgment, would indicate that (A) during
the period from the date of the latest financial statements of the Company
appearing in the Registration Statement and Prospectus to a specified date not
more than three business days prior to the date of such letter, there have been
any decreases in net current

                                      -30-

<PAGE>

assets or net assets as compared with amounts shown in such financial statements
or decreases in net sales or decreases [increases] in total or per share net
income [loss] compared with the corresponding period in the preceding year or
any change in the capitalization or long-term debt of the Company, except in all
cases as set forth in or contemplated by the Registration Statement and the
Prospectus, and (B) the unaudited interim financial statements of the Company,
if any, appearing in the Registration Statement and the Prospectus, do not
comply as to form in all material respects with the applicable accounting
requirements of the Act and the Regulations or any material modifications should
be made to such statements for them to be in conformity with generally accepted
accounting principles and practices on a basis substantially consistent with the
audited financial statements included in the Registration Statement or the
Prospectus; and (iii) they have compared specific dollar amounts, numbers of
shares, numerical data, percentages of revenues and earnings, and other
financial information pertaining to the Company set forth in the Prospectus
(with respect to all dollar amounts, numbers of shares, percentages and other
financial information contained in the Prospectus, to the extent that such
amounts, numbers, percentages and information may be derived from the general
accounting records of the Company, and excluding any questions requiring an
interpretation by legal counsel) with the results obtained from the application
of specified readings, inquiries and other requested procedures (which
procedures do not constitute an examination in accordance with generally
accepted auditing standards) set forth in the letter, and found them to be in
agreement.

               (g) There shall have been duly tendered to the Underwriter
certificates representing the Offered Shares to be sold on the Closing Date.

               (h) The NASD shall have indicated that it has no objection to the
underwriting arrangements pertaining to the sale of the Shares by the
Underwriter.

               (i) No action shall have been taken by the Commission or the NASD
the effect of which would make it improper, at any time prior to the Closing
Date or the Option Closing Date, as the case may be, for any member firm of the
NASD to execute transactions (as principal or as agent) in the Shares, and no
proceedings for the purpose of taking such action shall have been instituted or
shall be pending, or, to the best of the Underwriter's or the Company's
knowledge, shall be contemplated by the Commission or the NASD. The Company
represents at the date hereof, and shall represent as of the Closing Date or
Option Closing Date, as the case may be, that it has no knowledge that

                                      -31-

<PAGE>

any such action is in fact contemplated by the Commission or the
NASD.

               (j) The Company meets the current and any existing and proposed
criteria for inclusion of the Shares on the Nasdaq SmallCap Market.

               (k) All proceedings taken at or prior to the Closing Date or the
Option Closing Date, as the case may be, in connection with the authorization,
issuance and sale of the Shares shall be reasonably satisfactory in form and
substance to the Underwriter and to Underwriter's Counsel, and such counsel
shall have been furnished with all such documents, certificates and opinions as
they may request for the purpose of enabling them to pass upon the matters
referred to in Section 6(d) hereof and in order to evidence the accuracy and
completeness of any of the representations, warranties or statements of the
Company, the performance of any covenants of the Company, or the compliance by
the Company with any of the conditions herein contained.

               (k) As of the date hereof, the Company will have delivered to the
Underwriter the written undertakings of its officers, directors and
securityholders and/or registration rights holders, as the case may be, to the
effect of the matters set forth in Sections 5 (l) and (q).

               If any of the conditions specified in this Section 6 have not
been fulfilled, this Agreement may be terminated by the Underwriter on notice to
the Company.

          7. Indemnification.

               (a) The Company agrees to indemnify and hold harmless the
Underwriter, each officer, director, partner, employee and agent of the
Underwriter, and each person, if any, who controls the Underwriter within the
meaning of Section 15 of the Act or Section 20(a) of the Exchange Act, from and
against any and all losses, claims, damages, expenses or liabilities, joint or
several (and actions in respect thereof), to which they or any of them may
become subject under the Act or under any other statute or at common law or
otherwise, and, except as hereinafter provided, will reimburse the Underwriter
and each such person, if any, for any legal or other expenses reasonably
incurred by them or any of them in connection with investigating or defending
any actions, whether or not resulting in any liability, insofar as such losses,
claims, damages, expenses, liabilities or actions arise out of or are based upon
any untrue statement or alleged untrue statement of a material fact contained
(i) in the Registration Statement, in any Preliminary Prospectus or in the
Prospectus (or the Registration Statement or

                                      -32-

<PAGE>

Prospectus as from time to time amended or supplemented) or (ii) in any
application or other document executed by the Company, or based upon written
information furnished by or on behalf of the Company, filed in any jurisdiction
in order to qualify the Shares under the securities laws thereof (hereinafter
"application"), or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary in order to make the statements therein not misleading, in light of
the circumstances under which they were made, unless such untrue statement or
omission was made in such Registration Statement, Preliminary Prospectus,
Prospectus or application in reliance upon and in conformity with information
furnished in writing to the Company in connection therewith by the Underwriter
or any such person through the Underwriter expressly for use therein; provided,
however, that the indemnity agreement contained in this Section 7(a) with
respect to any Preliminary Prospectus will not inure to the benefit of the
Underwriter (or to the benefit of any other person that may be indemnified
pursuant to this Section 7(a)) if (A) the person asserting any such losses,
claims, damages, expenses or liabilities purchased the Shares which are the
subject thereof from the Underwriter or other indemnified person; (B) the
Underwriter or other indemnified person failed to send or give a copy of the
Prospectus to such person at or prior to the written confirmation of the sale of
such Shares to such person; and (C) the Prospectus did not contain any untrue
statement or alleged untrue statement or omission or alleged omission giving
rise to such cause, claim, damage, expense or liability.

               (b) The Underwriter agrees to indemnify and hold harmless the
Company, each of its directors, each of its officers who have signed the
Registration Statement and each person, if any, who controls the Company within
the meaning of Section 15 of the Act or Section 20(a) of the Exchange Act, from
and against any and all losses, claims, damages, expenses or liabilities, joint
or several (and actions in respect thereof), to which they or any of them may
become subject under the Act or under any other statute or at common law or
otherwise, and, except as hereinafter provided, will reimburse the Company and
each such director, officer or controlling person for any legal or other
expenses reasonably incurred by them or any of them in connection with
investigating or defending any actions, whether or not resulting in any
liability, insofar as such losses, claims, damages, expenses, liabilities or
actions arise out of or are based upon any untrue statement or alleged untrue
statement of a material fact contained (i) in the Registration Statement, in any
Preliminary Prospectus or in the Prospectus (or the Registration Statement or
Prospectus as from time to time amended or supplemented) or (ii) in any
application (including any application for registration of the Shares under
state securities

                                      -33-

<PAGE>

or Blue Sky laws), or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary in order to make the statements therein not misleading, in light of
the circumstances under which they were made, but only insofar as any such
statement or omission was made in reliance upon and in conformity with
information furnished in writing to the Company in connection therewith by the
Underwriter expressly for use therein.

               (c) Promptly after receipt of notice of the commencement of any
action in respect of which indemnity may be sought against any indemnifying
party under this Section 7, the indemnified party will notify the indemnifying
party in writing of the commencement thereof, and the indemnifying party will,
subject to the provisions hereinafter stated, assume the defense of such action
(including the employment of counsel satisfactory to the indemnified party and
the payment of expenses) insofar as such action relates to an alleged liability
in respect of which indemnity may be sought against the indemnifying party.
After notice from the indemnifying party of its election to assume the defense
of such claim or action, the indemnifying party shall no longer be liable to the
indemnified party under this Section 7 for any legal or other expenses
subsequently incurred by the indemnified party in connection with the defense
thereof other than reasonable costs of investigation; provided, however, that
if, in the reasonable judgment of the indemnified party or parties, it is
advisable for the indemnified party or parties to be represented by separate
counsel, the indemnified party or parties shall have the right to employ a
single counsel to represent the indemnified parties who may be subject to
liability arising out of any claim in respect of which indemnity may be sought
by the indemnified parties thereof against the indemnifying party, in which
event the fees and expenses of such separate counsel shall be borne by the
indemnifying party. Any party against whom indemnification may be sought under
this Section 7 shall not be liable to indemnify any person that might otherwise
be indemnified pursuant hereto for any settlement of any action effected without
such indemnifying party's consent, which consent shall not be unreasonably
withheld.

          8. Contribution. To provide for just and equitable contribution, if
(i) an indemnified party makes a claim for indemnification pursuant to Section 7
hereof (subject to the limitations thereof) and it is finally determined, by a
judgment, order or decree not subject to further appeal, that such claim for
indemnification may not be enforced, even though this Agreement expressly
provides for indemnification in such case; or (ii) any indemnified or
indemnifying party seeks contribution under the Act, the Exchange Act, or
otherwise, then the Company (including, for this purpose, any contribution made
by or on

                                      -34-

<PAGE>

behalf of any director of the Company, any officer of the Company who signed the
Registration Statement and any controlling person of the Company) as one entity
and the Underwriter (including, for this purpose, any contribution by or on
behalf of each person, if any, who controls the Underwriter within the meaning
of Section 15 of the Act or Section 20(a) of the Exchange Act and each officer,
director, partner, employee and agent of the Underwriter) as a second entity,
shall contribute to the losses, liabilities, claims, damages and expenses
whatsoever to which any of them may be subject, so that the Underwriter is
responsible for the proportion thereof equal to the percentage which the
underwriting discount per Share set forth on the cover page of the Prospectus
represents of the initial public offering price per Share set forth on the cover
page of the Prospectus and the Company is responsible for the remaining portion;
provided, however, that if applicable law does not permit such allocation, then,
if applicable law permits, other relevant equitable considerations such as the
relative fault of the Company and the Underwriter in connection with the facts
which resulted in such losses, liabilities, claims, damages and expenses shall
also be considered. The relative fault, in the case of an untrue statement,
alleged untrue statement, omission or alleged omission, shall be determined by,
among other things, whether such statement, alleged statement, omission or
alleged omission relates to information supplied by the Company or by the
Underwriter, and the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement, alleged statement,
omission or alleged omission. The Company and the Underwriter agree that it
would be unjust and inequitable if the respective obligations of the Company and
the Underwriter for contribution were determined by pro rata or per capita
allocation of the aggregate losses, liabilities, claims, damages and expenses or
by any other method of allocation that does not reflect the equitable
considerations referred to in this Section 8. No person guilty of a fraudulent
misrepresentation (within the meaning of Section 11(f) of the Act) will be
entitled to contribution from any person who is not guilty of such fraudulent
misrepresentation. For purposes of this Section 8, each person, if any, who
controls the Underwriter within the meaning of Section 15 of the Act or Section
20(a) of the Exchange Act and each officer, director, partner, employee and
agent of the Underwriter will have the same rights to contribution as the
Underwriter, and each person, if any, who controls the Company within the
meaning of Section 15 of the Act or Section 20(a) of the Exchange Act, each
officer of the Company who has signed the Registration Statement and each
director of the Company will have the same rights to contribution as the
Company, subject in each case to the provisions of this Section 8. Anything in
this Section 8 to the contrary notwithstanding, no party will be liable for
contribution with respect to the settlement of any

                                      -35-

<PAGE>

claim or action effected without its written consent. This Section 8 is intended
to supersede, to the extent permitted by law, any right to contribution under
the Act or the Exchange Act or otherwise available.

          9. Survival of Indemnities, Contribution, Warranties and
Representations. The respective indemnity and contribution agreements of the
Company and the Underwriter contained in Sections 7 and 8 hereof, and the
representations and warranties of the Company contained herein shall remain
operative and in full force and effect, regardless of any termination or
cancellation of this Agreement or any investigation made by or on behalf of the
Underwriter, the Company or any of its directors and officers, or any
controlling person referred to in said Sections, and shall survive the delivery
of, and payment for, the Shares.

          10. Termination of Agreement.

               (a) The Company, by written or telegraphic notice to the
Underwriter, or the Underwriter, by written or telegraphic notice to the
Company, may terminate this Agreement prior to the earlier of (i) 11:00 A.M.,
New York City time, on the first full business day after the Effective Date; or
(ii) the time when the Underwriter, after the Registration Statement becomes
effective, releases the Offered Shares for public offering. The time when the
Underwriter "releases the Offered Shares for public offering" for the purposes
of this Section 10 means the time when the Underwriter releases for publication
the first newspaper advertisement, which is subsequently published, relating to
the Offered Shares, or the time when the Underwriter releases for delivery to
members of a selling group copies of the Prospectus and an offering letter or an
offering telegram relating to the Offered Shares, whichever will first occur.

               (b) This Agreement, including without limitation, the obligation
to purchase the Shares and the obligation to purchase the Optional Shares after
exercise of the option referred to in Section 3 hereof, are subject to
termination in the absolute discretion of the Underwriter, by notice given to
the Company prior to delivery of and payment for all the Offered Shares or such
Optional Shares, as the case may be, if, prior to such time, any of the
following shall have occurred: (i) the Company withdraws the Registration
Statement from the Commission or the Company does not or cannot expeditiously
proceed with the public offering; (ii) the representations and warranties in
Section 4 hereof are not materially correct or cannot be complied with; (iii)
trading in securities generally on the New York Stock Exchange or the American
Stock Exchange will have been suspended; (iv) limited or minimum prices will
have been established on

                                      -36-

<PAGE>

either such Exchange; (v) a banking moratorium will have been declared either by
federal or New York State authorities; (vi) any other restrictions on
transactions in securities materially affecting the free market for securities
or the payment for such securities, including the Offered Shares or the Optional
Shares, will be established by either of such Exchanges, by the Commission, by
any other federal or state agency, by action of the Congress or by Executive
Order; (vii) trading in any securities of the Company shall have been suspended
or halted by any national securities exchange, the NASD or the Commission;
(viii) there has been a materially adverse change in the condition (financial or
otherwise), prospects or obligations of the Company; (ix) the Company will have
sustained a material loss, whether or not insured, by reason of fire, flood,
accident or other calamity; (x) any action has been taken by the government of
the United States or any department or agency thereof which, in the judgment of
the Underwriter, has had a material adverse effect upon the market or potential
market for securities in general; or (xi) the market for securities in general
or political, financial or economic conditions will have so materially adversely
changed that, in the judgment of the Underwriter, it will be impracticable to
offer for sale, or to enforce contracts made by the Underwriter for the resale
of, the Offered Shares or the Optional Shares, as the case may be.

               (c) If this Agreement is terminated pursuant to Section 6 hereof
or this Section 10 or if the purchases provided for herein are not consummated
because any condition of the Underwriter's obligations hereunder is not
satisfied or because of any refusal, inability or failure on the part of the
Company to comply with any of the terms or to fulfill any of the conditions of
this Agreement, or if for any reason the Company shall be unable to or does not
perform all of its obligations under this Agreement, the Company will not be
liable to the Underwriter for damages on account of loss of anticipated profits
arising out of the transactions covered by this Agreement, but the Company will
remain liable to the extent provided in Sections 5(j), 7, 8 and 9 of this
Agreement.

          11. Information Furnished by the Underwriter to the Company. It is
hereby acknowledged and agreed by the parties hereto that for the purposes of
this Agreement, including, without limitation, Sections 4(f), 7(a), 7(b) and 8
hereof, the only information given by the Underwriter to the Company for use in
the Prospectus are the statements set forth in the last sentence of the last
paragraph on the cover page, the statement appearing in the last paragraph on
page __ with respect to stabilizing the market price of Shares, the information
in the __ paragraph on page __ with respect to concessions and reallowances, and
the information in the ___ paragraph on page

                                      -37-

<PAGE>

___ with respect to the determination of the public offering price, as such
information appears in any Preliminary Prospectus and in the Prospectus.

          12. Notices and Governing Law. All communications hereunder will be in
writing and, except as otherwise provided, will be delivered at, or mailed by
certified mail, return receipt requested, or telegraphed to, the following
addresses: if to the Underwriter, to Whale Securities Co., L.P., Attention:
William G. Walters, 650 Fifth Avenue, New York, New York 10019, with a copy to
Tenzer Greenblatt LLP, Attention: Robert J. Mittman, Esq., 405 Lexington Avenue,
New York, New York 10174; if to the Company, addressed to it at 909 Third
Avenue, 9th Floor, New York, New York 10022, with a copy to Bizar Martin & Taub,
LLP, Attention: Sam Schwartz, Esq., 1350 Avenue of the Americas, 29th Floor, New
York, New York 10019.

               This Agreement shall be deemed to have been made and delivered in
New York City and shall be governed as to validity, interpretation,
construction, effect and in all other respects by the internal laws of the State
of New York. The Company (1) agrees that any legal suit, action or proceeding
arising out of or relating to this Agreement shall be instituted exclusively in
New York State Supreme Court, County of New York, or in the United States
District Court for the Southern District of New York, (2) waives any objection
which the Company may have now or hereafter to the venue of any such suit,
action or proceeding, and (3) irrevocably consents to the jurisdiction of the
New York State Supreme Court, County of New York, and the United States District
Court for the Southern District of New York in any such suit, action or
proceeding. The Company further agrees to accept and acknowledge service of any
and all process which may be served in any such suit, action or proceeding in
the New York State Supreme Court, County of New York, or in the United States
District Court for the Southern District of New York and agrees that service of
process upon the Company mailed by certified mail to the Company's address shall
be deemed in every respect effective service of process upon the Company, in any
such suit, action or proceeding.

          13. Parties in Interest. This Agreement is made solely for the benefit
of the Underwriter, the Company and, to the extent expressed, any person
controlling the Company or the Underwriter, each officer, director, partner,
employee and agent of the Underwriter, the directors of the Company, its
officers who have signed the Registration Statement, and their respective
executors, administrators, successors and assigns, and, no other person will
acquire or have any right under or by virtue of this Agreement. The term
"successors and assigns" will not include

                                      -38-

<PAGE>


any purchaser of the Shares from the Underwriter, as such purchaser.

          If the foregoing is in accordance with your understanding of our
agreement, kindly sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement between the Company and the
Underwriter in accordance with its terms.

                                  Very truly yours,

                                  NETWORK-1 SECURITY SOLUTIONS, INC.


                                  By
                                    ------------------------------
                                    Name:
                                    Title:


Confirmed and accepted in 
New York, N.Y., as of the 
date first above written:

WHALE SECURITIES CO., L.P.

By:  Whale Securities Corp.,
     General Partner

By
  --------------------------------
  Name:
  Title:



                                      -39-


<PAGE>

                                                                     Exhibit 1.2

          WARRANT AGREEMENT dated as of _________, 1998 between Network-1
Security Solutions, Inc., a Delaware corporation (the "Company"), and Whale
Securities Co., L.P. (hereinafter referred to as the "Underwriter").

                              W I T N E S S E T H:

          WHEREAS, the Company proposes to issue to the Underwriter warrants
(the "Warrants") to purchase up to 170,000 (as such number may be adjusted from
time to time pursuant to Article 8 of this Agreement) shares (the "Shares") of
common stock, par value $.01 per share (the "Common Stock"), of the Company; and

          WHEREAS, the Underwriter has agreed, pursuant to the underwriting
agreement (the "Underwriting Agreement") dated _________, 1998 between the
Underwriter and the Company, to act as the underwriter in connection with the
Company's proposed public offering (the "Public Offering") of 1,700,000 shares
of Common Stock (the "Public Shares") at an initial public offering price of
$6.00 per Public Share; and

          WHEREAS, the Warrants issued pursuant to this Agreement are being
issued by the Company to the Underwriter or to its designees who are officers
and partners of the Underwriter or to members of the selling group participating
in the distribution of the Public Shares to the public in the Public Offering
and/or their respective directors, officers or partners (collectively, the
"Designees"), in consideration for, and as part of the Underwriter's
compensation in connection with, the Underwriter acting as the Underwriter
pursuant to the Underwriting Agreement;


<PAGE>


          NOW, THEREFORE, in consideration of the premises, the payment by the
Underwriter to the Company of ONE HUNDRED DOLLARS ($100.00), the agreements
herein set forth and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

          1. Grant.

          The Underwriter, and/or the Designees are hereby granted the right to
purchase, at any time from __________, 1999 until 5:00 P.M., New York time, on
_______, 2003 (the "Warrant Exercise Term"), up to 170,000 fully-paid and
non-assessable Shares at an initial exercise price (subject to adjustment as
provided in Article 8 hereof) of $9.30 per Share.

          2. Warrant Certificates.

          The warrant certificates delivered and to be delivered pursuant to
this Agreement (the "Warrant Certificates") shall be in the form set forth in
Exhibit A attached hereto and made a part hereof, with such appropriate
insertions, omissions, substitutions and other variations as required or
permitted by this Agreement.

          3. Exercise of Warrant.

               3.1. Cash Exercise. The Warrants initially are exercisable at a
price of $9.30 per Share, payable in cash or by check to the order of the
Company, or any combination thereof, subject to adjustment as provided in
Article 8 hereof. Upon surrender of the Warrant Certificate with the annexed
Form of Election to Purchase duly executed, together with payment of the
Exercise Price (as hereinafter defined) for the Shares purchased,

                                       -2-

<PAGE>

at the Company's principal offices (currently located at 70 Walnut Street,
Wellesley Hills, Massachusetts 02481) the registered holder of a Warrant
Certificate ("Holder" or "Holders") shall be entitled to receive a certificate
or certificates for the Shares so purchased. The purchase rights represented by
each Warrant Certificate are exercisable at the option of the Holder thereof, in
whole or in part (but not as to fractional Shares). In the case of the purchase
of less than all the Shares purchasable under any Warrant Certificate, the
Company shall cancel said Warrant Certificate upon the surrender thereof and
shall execute and deliver a new Warrant Certificate of like tenor for the
balance of the Shares purchasable thereunder.

               3.2. Cashless Exercise. At any time during the Warrant Exercise
Term, the Holder may, at the Holder's option, exchange, in whole or in part, the
Warrants represented by such Holder's Warrant Certificate (a "Warrant
Exchange"), into the number of Shares determined in accordance with this Section
3.2, by surrendering such Warrant Certificate at the principal office of the
Company or at the office of its transfer agent, accompanied by a notice stating
such Holder's intent to effect such exchange, the number of Warrants to be so
exchanged and the date on which the Holder requests that such Warrant Exchange
occur (the "Notice of Exchange"). The Warrant Exchange shall take place on the
date specified in the Notice of Exchange or, if later, the date the Notice of
Exchange is received by the Company (the "Exchange Date"). Certificates for the
Shares issuable upon such Warrant Exchange and, if applicable, a new Warrant

                                       -3-

<PAGE>

Certificate of like tenor representing the Warrants which were subject to the
surrendered Warrant Certificate and not included in the Warrant Exchange, shall
be issued as of the Exchange Date and delivered to the Holder within three (3)
days following the Exchange Date. In connection with any Warrant Exchange, the
Holder shall be entitled to subscribe for and acquire (i) the number of Shares
(rounded to the next highest integer) which would, but for the Warrant Exchange,
then be issuable pursuant to the provision of Section 3.1 above upon the
exercise of the Warrants specified by the Holder in its Notice of Exchange (the
"Total Number") less (ii) the number of Shares equal to the quotient obtained by
dividing (a) the product of the Total Number and the existing Exercise Price (as
hereinafter defined) by (b) the Market Price (as hereinafter defined) of a
Public Share on the day preceding the Warrant Exchange. "Market Price" at any
date shall be deemed to be the last reported sale price, or, in case no such
reported sales takes place on such day, the average of the last reported sale
prices for the last three (3) trading days, in either case as officially
reported by the principal securities exchange on which the Common Stock is
listed or admitted to trading or as reported in the NASDAQ National market
System, or, if the Common Stock is not listed or admitted to trading on any
national securities exchange or quoted on the NASDAQ National Market System, the
closing bid price as furnished by (i) the National Association of Securities
Dealers, Inc. through NASDAQ or (ii) a similar organization if NASDAQ is no
longer reporting such information.

                                       -4-

<PAGE>

          4. Issuance of Certificates.

          Upon the exercise of the Warrants, the issuance of certificates for
the Shares purchased shall be made forthwith (and in any event within three (3)
business days thereafter) without charge to the Holder thereof including,
without limitation, any tax which may be payable in respect of the issuance
thereof, and such certificates shall (subject to the provisions of Article 5
hereof) be issued in the name of, or in such names as may be directed by, the
Holder thereof; provided, however, that the Company shall not be required to pay
any tax which may be payable in respect of any transfer involved in the issuance
and delivery of any such certificates in a name other than that of the Holder
and the Company shall not be required to issue or deliver such certificates
unless or until the person or persons requesting the issuance thereof shall have
paid to the Company the amount of such tax or shall have established to the
satisfaction of the Company that such tax has been paid.

          The Warrant Certificates and the certificates representing the Shares
shall be executed on behalf of the Company by the manual or facsimile signature
of the present or any future Chairman or Vice Chairman of the Board of
Directors, Chief Executive Officer or President or Vice President of the Company
under its corporate seal reproduced thereon, attested to by the manual or
facsimile signature of the present or any future Secretary or Assistant
Secretary of the Company. Warrant Certificates shall be dated the date of
execution by the Company

                                       -5-

<PAGE>

upon initial issuance, division, exchange, substitution or transfer.

          Upon exercise, in part or in whole, of the Warrants, certificates
representing the Shares shall bear a legend substantially similar to the
following:

     "The securities represented by this certificate have not been registered
     for purposes of public distribution under the Securities Act of 1933, as
     amended (the "Act"), and may not be offered or sold except (i) pursuant to
     an effective registration statement under the Act, (ii) to the extent
     applicable, pursuant to Rule 144 under the Act (or any similar rule under
     such Act relating to the disposition of securities), or (iii) upon the
     delivery by the holder to the Company of an opinion of counsel, reasonably
     satisfactory to counsel to the Company, stating that an exemption from
     registration under such Act is available."

          5. Restriction on Transfer of Warrants.

          The Holder of a Warrant Certificate, by the Holder's acceptance
thereof, covenants and agrees that the Warrants are being acquired as an
investment and not with a view to the distribution thereof, and that the
Warrants may not be sold, transferred, assigned, hypothecated or otherwise
disposed of, in whole or in part, for a period of one (1) year from the date
hereof, except to the Designees.

          6. Price.

               6.1. Initial and Adjusted Exercise Price. The initial exercise
price of each Warrant shall be $9.30 per Share. The adjusted exercise price per
Share shall be the price which shall result from time to time from any and all
adjustments of the initial exercise price per Share in accordance with the
provisions of Article 8 hereof.

                                       -6-

<PAGE>

               6.2. Exercise Price. The term "Exercise Price" herein shall mean
the initial exercise price or the adjusted exercise price, depending upon the
context.

          7. Registration Rights.

               7.1. Registration Under the Securities Act of 1933. None of the
Warrants or Shares have been registered for purposes of public distribution
under the Securities Act of 1933, as amended (the "Act").

               7.2. Registrable Securities. As used herein the term "Registrable
Security" means each of the Warrants, the Shares and any shares of Common Stock
issued upon any stock split or stock dividend in respect of such Shares;
provided, however, that with respect to any particular Registrable Security,
such security shall cease to be a Registrable Security when, as of the date of
determination, (i) it has been effectively registered under the Act and disposed
of pursuant thereto, (ii) it has ceased to be outstanding or (iii) such
Registrable Security may be sold within 60 days under Rule 144(k) (without
limitation or restriction as to quantity or timing and without registration
under the Act); provided however, that a security which ceases to become a
Registrable Security as a result of clause (iii) shall become a Registrable
Security if at any time thereafter it is not eligible to be sold pursuant to
Rule 144(k) and shall thereafter only cease to be a Registrable Security under
the conditions specified in clause (i) or (ii) or if registration under the Act
is no longer required for the subsequent public distribution of such security.
The term "Registrable Securities" means any

                                       -7-

<PAGE>

and/or all of the securities falling within the foregoing definition of a
"Registrable Security." In the event of any merger, reorganization,
consolidation, recapitalization or other change in corporate structure affecting
the Common Stock, such adjustment shall be made in the definition of
"Registrable Security" as is appropriate in order to prevent any dilution or
enlargement of the rights granted pursuant to this Article 7.

               7.3. Piggyback Registration.

                    (a) If, at any time during the seven years following the
effective date of the Public Offering, the Company proposes to prepare and file
one or more post-effective amendments to the registration statement filed in
connection with the Public Offering or any new registration statement or
post-effective amendments thereto covering equity or debt securities of the
Company, or any such securities of the Company held by its shareholders (in any
such case, other than in connection with a merger, acquisition or pursuant to
Form S-8 or successor form), (for purposes of this Article 7, collectively, the
"Registration Statement"), it will give written notice of its intention to do so
by registered mail ("Notice"), at least thirty (30) business days prior to the
filing of each such Registration Statement, to all holders of the Registrable
Securities. Upon the written request of such a holder (a "Requesting Holder"),
made within twenty (20) business days after receipt of the Notice, that the
Company include any of the Requesting Holder's Registrable Securities in the
proposed Registration Statement, the Company shall, as to each such Requesting
Holder, use its best efforts to

                                       -8-

<PAGE>

effect the registration under the Act of the Registrable Securities which it has
been so requested to register ("Piggyback Registration"), at the Company's sole
cost and expense and at no cost or expense to the Requesting Holders (except as
provided in Section 7.5(b) hereof). Notwithstanding the provisions of this
Section 7.3, the Company shall have the right at any time after it shall have
given written notice pursuant to this Section 7.3 (irrespective of whether any
written request for inclusion of Registrable Securities shall have already been
made) to elect not to file any such proposed Registration Statement, or to
withdraw the same after the filing but prior to the effective date thereof.

                    (b) If the offering with respect to which a Registration
Statement is filed is an underwritten secondary offering of the Company's
securities and the managing underwriter advises the Company in writing that in
its opinion the inclusion of all or a portion of the Registrable Securities
requested to be registered, when added to the securities being registered by the
Company, will exceed the maximum amount of the Company's securities which can be
marketed (i) at a price reasonably related to their current market value, or
(ii) without otherwise materially adversely affecting the entire offering, the
Company will include in such Registration Statement: (i) first, the securities
being sold for the account of the Company; (ii) second, the number of
Registrable Securities to be included that, in the opinion of such managing
underwriter, can be sold pro rata among the respective holders of such
securities on the basis of

                                       -9-

<PAGE>

the amount of Registrable Securities then owned by each such holder.

               7.4. Demand Registration.

                    (a) At any time during the Warrant Exercise Term, any
"Majority Holder" (as such term is defined in Section 7.4(c) below) of the
Registrable Securities shall have the right (which right is in addition to the
piggyback registration rights provided for under Section 7.3 hereof),
exercisable by written notice to the Company (the "Demand Registration
Request"), to have the Company prepare and file with the Securities and Exchange
Commission (the "Commission"), on one occasion, at the sole expense of the
Company (except as provided in Section 7.5(b) hereof), a Registration Statement
and such other documents, including a prospectus, as may be necessary (in the
opinion of both counsel for the Company and counsel for such Majority Holder),
in order to comply with the provisions of the Act, so as to permit a public
offering and sale of the Registrable Securities by the holders thereof. The
Company shall use its best efforts to cause the Registration Statement to become
effective under the Act, so as to permit a public offering and sale of the
Registrable Securities by the holders thereof. Once effective, the Company will
use its best efforts to maintain the effectiveness of the Registration Statement
until the earlier of (i) the date that all of the Registrable Securities have
been sold or (ii) the date that the holders of the Registrable Securities
receive an opinion of counsel to the Company that all of the Registrable
Securities may be freely traded (without

                                      -10-

<PAGE>

limitation or restriction as to quantity or timing and without registration
under the Act) under Rule 144(k) promulgated under the Act or otherwise.

                    (b) The Company covenants and agrees to give written notice
of any Demand Registration Request to all holders of the Registrable Securities
within ten (10) business days from the date of the Company's receipt of any such
Demand Registration Request. After receiving notice from the Company as provided
in this Section 7.4(b), holders of Registrable Securities may request the
Company to include their Registrable Securities in the Registration Statement to
be filed pursuant to Section 7.4(a) hereof by notifying the Company of their
decision to have such securities included within ten (10) days of their receipt
of the Company's notice.

                    (c) The term "Majority Holder" as used in Section 7.4 hereof
shall mean any holder or any combination of holders of Registrable Securities,
if included in such holders' Registrable Securities are that aggregate number of
shares of Common Stock (including Shares already issued and Shares issuable
pursuant to the exercise of outstanding Warrants) as would constitute a majority
of the aggregate number of Shares (including Shares already issued and Shares
issuable pursuant to the exercise of outstanding Warrants) included in all the
Registrable Securities.

               7.5. Covenants of the Company With Respect to Registration. The
Company covenants and agrees as follows:

                                      -11-

<PAGE>

                    (a) In connection with any registration under Section 7.4
hereof, the Company shall file the Registration Statement as expeditiously as
possible, but in any event no later than sixty (60) days following receipt of
any demand therefor, shall use its best efforts to have any such Registration
Statement declared effective at the earliest possible time, and shall furnish
each holder of Registrable Securities such number of prospectuses as shall
reasonably be requested, provided, however, that the Company may, at any time,
delay the filing or delay or suspend the effectiveness of such demand
registration or, without suspending such effectiveness, and instruct the Holders
not to sell any securities included in such demand registration, (i) if the
Company shall have determined upon the written advice of counsel (confirmation
of which notice shall be provided to the Holder(s) in writing by such counsel)
that the Company would be required to disclose any actions taken or proposed to
be taken by the Company in good faith and for valid business reasons, including
without limitation, the acquisition or divestiture of assets, which disclosure
would have a material adverse effect on the Company or on such actions, or (ii)
if required by law, to update the prospectus relating to any such registration
to include updated financial statements (a "Suspension Period") by providing the
Holder(s) with written notice of such Suspension Period and the reasons
therefor; and provided further, that the Suspension Periods, in the aggregate,
do not exceed ninety (90) days. The Company shall provide such

                                      -12-

<PAGE>

notice as soon as practicable and in any event prior to the commencement of 
such Suspension Period.

                    (b) The Company shall pay all costs, fees and expenses
(other than underwriting fees, discounts and nonaccountable expense allowance
applicable to the Registrable Securities and the fees and expenses of counsel
retained by the holders of Registrable Securities) in connection with all
Registration Statements filed pursuant to Sections 7.3 and 7.4(a) hereof
including, without limitation, the Company's legal and accounting fees, printing
expenses, and blue sky fees and expenses.

                    (c) The Company will take all necessary action which may be
required in qualifying or registering the Registrable Securities included in the
Registration Statement for offering and sale under the securities or blue sky
laws of such states as are reasonably requested by the holders of such
securities; provided that the Company shall not be obligated to execute or file
any consent to service of process or qualify as a foreign corporation to do
business under the laws of any such jurisdiction.

                    (d) The Company shall indemnify any holder of the
Registrable Securities to be sold pursuant to any Registration Statement and any
underwriter or person deemed to be an underwriter under the Act and each person,
if any, who controls such holder or underwriter or person deemed to be an
underwriter within the meaning of Section 15 of the Act or Section 20(a) of the
Securities Exchange Act of 1934, as amended ("Exchange Act"),

                                      -13-

<PAGE>

against all loss, claim, damage, expense or liability (including all expenses
reasonably incurred in investigating, preparing or defending against any claim
whatsoever) to which any of them may become subject under the Act, the Exchange
Act or otherwise, arising from such registration statement to the same extent
and with the same effect as the provisions pursuant to which the Company has
agreed to indemnify the Underwriter as set forth in Section 7 of the
Underwriting Agreement and to provide for just and equitable contribution as set
forth in Section 8 of the Underwriting Agreement.

                    (e) Any holder of Registrable Securities to be sold pursuant
to a registration statement, and such Holder's successors and assigns, shall
severally, and not jointly, indemnify, the Company, its officers and directors
and each person, if any, who controls the Company within the meaning of Section
15 of the Act or Section 20(a) of the Exchange Act, against all loss, claim,
damage or expense or liability (including all expenses reasonably incurred in
investigating, preparing or defending against any claim whatsoever) to which
they may become subject under the Act, the Exchange Act or otherwise, arising
from information furnished by or on behalf of such holder, or such Holder's
successors or assigns, for specific inclusion in such Registration Statement to
the same extent and with the same effect as the provisions pursuant to which the
Underwriter has agreed to indemnify the Company as set forth in Section 7 of the
Underwriting Agreement and to provide for just and equitable

                                      -14-

<PAGE>

contribution as set forth in Section 8 of the Underwriting Agreement.

                    (f) Nothing contained in this Agreement shall be construed
as requiring any Holder to exercise the Warrants held by such Holder prior to
the initial filing of any registration statement or the effectiveness thereof.

                    (g) The Company shall promptly deliver copies of all
correspondence between the Commission and the Company, its counsel or auditors
and all memoranda relating to discussions with the Commission or its staff with
respect to the Registration Statement to each holder of Registrable Securities
included for such registration in such Registration Statement pursuant to
Section 7.3 hereof or Section 7.4 hereof requesting such correspondence and
memoranda and to the managing underwriter, if any, of the offering in connection
with which such Holder's Registrable Securities are being registered and shall
permit each holder of Registrable Securities and such underwriter to do such
reasonable investigation, upon reasonable advance notice, with respect to
information contained in or omitted from the Registration Statement as it deems
reasonably necessary to comply with applicable securities laws or rules of the
National Association of Securities Dealers, Inc. Such investigation shall
include access to books, records and properties and opportunities to discuss the
business of the Company with its officers and independent auditors, all to such
reasonable extent and at such reasonable times and as often as

                                      -15-

<PAGE>

any such holder of Registrable Securities or underwriter shall reasonably 
request.

          8. Adjustments of Exercise Price and Number of Shares.

               8.1. Computation of Adjusted Price. In case the Company shall at
any time after the date hereof pay a dividend in shares of Common Stock or make
a distribution in shares of Common Stock to all existing holders of Common
Stock, then upon such dividend or distribution the Exercise Price in effect
immediately prior to such dividend or distribution shall forthwith be reduced to
a price determined by dividing:

                    (a) an amount equal to the total number of shares of Common
Stock outstanding immediately prior to such dividend or distribution multiplied
by the Exercise Price in effect immediately prior to such dividend or
distribution, by

                    (b) the total number of shares of Common Stock outstanding
immediately after such issuance or sale.

                 For the purposes of any computation to be made in accordance 
with the provisions of this Section 8.1, the Common Stock issuable by way of
dividend or other distribution on any stock of the Company shall be deemed to
have been issued immediately after the opening of business on the date following
the date fixed for the determination of stockholders entitled to receive such
dividend or other distribution.

               8.2. Subdivision and Combination. In case the Company shall at
any time subdivide or combine the outstanding shares of Common Stock, the
Exercise Price shall forthwith be

                                      -16-

<PAGE>

proportionately decreased in the case of subdivision or increased in the case 
of combination.

               8.3. Adjustment in Number of Shares. Upon each adjustment of the
Exercise Price pursuant to the provisions of this Article 8, the number of
Shares issuable upon the exercise of each Warrant shall be adjusted to the
nearest full number by multiplying a number equal to the Exercise Price in
effect immediately prior to such adjustment by the number of Shares issuable
upon exercise of the Warrants immediately prior to such adjustment and dividing
the product so obtained by the adjusted Exercise Price.

               8.4. Reclassification, Consolidation, Merger, etc. In case of any
reclassification or change of the outstanding shares of Common Stock (other than
a change in par value to no par value, or from no par value to par value, or as
a result of a subdivision or combination), or in the case of any consolidation
of the Company with, or merger of the Company into, another corporation (other
than a consolidation or merger in which the Company is the surviving corporation
and which does not result in any reclassification or change of the outstanding
shares of Common Stock, except a change as a result of a subdivision or
combination of such shares or a change in par value, as aforesaid), or in the
case of a sale or conveyance to another corporation of the property of the
Company as an entirety, the Holders shall thereafter have the right to purchase
the kind and number of shares of stock and other securities and property
receivable upon such reclassification, change, consolidation,

                                      -17-

<PAGE>

merger, sale or conveyance as if the Holders were the owners of the shares of
Common Stock underlying the Warrants immediately prior to any such events at a
price equal to the product of (x) the number of shares of Common Stock issuable
upon exercise of the Holder's Warrants and (y) the Exercise Price in effect
immediately prior to the record date for such reclassification, change,
consolidation, merger, sale or conveyance as if such Holders had exercised the
Warrants.

               8.5. Determination of Outstanding Shares of Common Stock. The
number of shares of Common Stock at any one time outstanding shall include the
aggregate number of shares of Common Stock issued and the aggregate number of
shares of Common Stock issuable upon the exercise of options, rights, warrants
and upon the conversion or exchange of convertible or exchangeable securities.

               8.6. Dividends and Other Distributions with Respect to
Outstanding Securities. In the event that the Company shall at any time prior to
the exercise of all Warrants make any distribution of its assets to holders of
its Common Stock as a liquidating or a partial liquidating dividend, then the
holder of Warrants who exercises its Warrants after the record date for the
determination of those holders of Common Stock entitled to such distribution of
assets as a liquidating or partial liquidating dividend shall be entitled to
receive for the Warrant Price per Warrant, in addition to each share of Common
Stock, the amount of such distribution (or, at the option of the Company, a sum
equal to the value of any such assets at the time of such distribution

                                      -18-

<PAGE>

as determined by the Board of Directors of the Company in good faith) which
would have been payable to such holder had he been the holder of record of the
Common Stock receivable upon exercise of his Warrant on the record date for the
determination of those entitled to such distribution. At the time of any such
dividend or distribution, the Company shall make appropriate reserves to ensure
the timely performance of the provisions of this Subsection 8.6.

               8.7. Subscription Rights for Shares of Common Stock or Other
Securities. In the case that the Company or an affiliate of the Company shall at
any time after the date hereof and prior to the exercise of all the Warrants
issue any rights, warrants or options to subscribe for shares of Common Stock or
any other securities of the Company or of such affiliate to all the shareholders
of the Company, the Holders of unexercised Warrants on the record date set by
the Company or such affiliate in connection with such issuance of rights,
warrants or options shall be entitled, in addition to the shares of Common Stock
or other securities receivable upon the exercise of the Warrants, to receive
such rights, warrants or options shall be entitled, in addition to the shares of
Common Stock or other securities receivable upon the exercise of the Warrants,
to receive such rights at the time such rights, warrants or options that such
Holders would have been entitled to receive had they been, on such record date,
the holders of record of the number of whole shares of Common Stock then
issuable upon exercise of their outstanding Warrants (assuming for purposes of
this Section 8.7),

                                      -19-

<PAGE>

that the exercise of the Warrants is permissible immediately upon issuance).

          9. Exchange and Replacement of Warrant Certificates.

          Each Warrant Certificate is exchangeable without expense, upon the
surrender thereof by the registered Holder at the principal executive office of
the Company, for a new Warrant Certificate of like tenor and date representing
in the aggregate the right to purchase the same number of securities in such
denominations as shall be designated by the Holder thereof at the time of such
surrender.

          Upon receipt by the Company of evidence reasonably satisfactory to it
of the loss, theft, destruction or mutilation of any Warrant Certificate, and,
in case of loss, theft or destruction, of indemnity or security reasonably
satisfactory to it, and reimbursement to the Company of all reasonable expenses
incidental thereto, and upon surrender and cancellation of the Warrant
Certificate, if mutilated, the Company will make and deliver a new Warrant
Certificate of like tenor, in lieu thereof.

          10. Elimination of Fractional Interests.

          The Company shall not be required to issue certificates representing
fractions of Shares, nor shall it be required to issue scrip or pay cash in lieu
of fractional interests, it being the intent of the parties that all fractional
interests shall be eliminated by rounding any fraction up to the nearest whole
number of Shares.

                                      -20-

<PAGE>

          11. Reservation and Listing of Securities.

          The Company shall at all times reserve and keep available out of its
authorized shares of Common Stock, solely for the purpose of issuance upon the
exercise of the Warrants, such number of shares of Common Stock as shall be
issuable upon the exercise thereof. The Company covenants and agrees that, upon
exercise of the Warrants and payment of the Exercise Price therefor, all Shares
issuable upon such exercise shall be duly and validly issued, fully paid,
non-assessable and not subject to the preemptive rights of any shareholder. As
long as the Warrants shall be outstanding, the Company shall use its best
efforts to cause all shares of Common Stock issuable upon the exercise of the
Warrants to be listed on or quoted by NASDAQ or listed on such national
securities exchange, in the event the Common Stock is listed on a national
securities exchange.

          12. Notices to Warrant Holders.

          Nothing contained in this Agreement shall be construed as conferring
upon the Holder or Holders the right to vote or to consent or to receive notice
as a shareholder in respect of any meetings of shareholders for the election of
directors or any other matter, or as having any rights whatsoever as a
shareholder of the Company. If, however, at any time prior to the expiration of
the Warrants and their exercise, any of the following events shall occur:

               (a) the Company shall take a record of the holders of its shares
          of Common Stock for the purpose of entitling them to receive a
          dividend or distribution

                                      -21-

<PAGE>

          payable otherwise than in cash, or a cash dividend or distribution
          payable otherwise than out of current or retained earnings, as
          indicated by the accounting treatment of such dividend or distribution
          on the books of the Company; or

               (b) the Company shall offer to all the holders of its Common
          Stock any additional shares of capital stock of the Company or
          securities convertible into or exchangeable for shares of capital
          stock of the Company, or any option, right or warrant to subscribe
          therefor; or

               (c) a dissolution, liquidation or winding up of the Company
          (other than in connection with a consolidation or merger) or a sale of
          all or substantially all of its property, assets and business as an
          entirety shall be proposed; or

               (d) reclassification or change of the outstanding shares of
          Common Stock (other than a change in par value to no par value, or
          from no par value to par value, or as a result of a subdivision or
          combination), consolidation of the Company with, or merger of the
          Company into, another corporation (other than a consolidation or
          merger in which the Company is the surviving corporation and which
          does not result in any reclassification or change of the outstanding
          shares of Common Stock, except a change as a result of a subdivision
          or combination of such shares or a change

                                      -22-

<PAGE>

          in par value, as aforesaid), or a sale or conveyance to another
          corporation of the property of the Company as an entirety is proposed;
          or

               (e) The Company or an affiliate of the Company shall propose to
          issue any rights to subscribe for shares of Common Stock or any other
          securities of the Company or of such affiliate to all the shareholders
          of the Company;

then, in any one or more of said events, the Company shall give written notice
to the Holder or Holders of such event at least fifteen (15) days prior to the
date fixed as a record date or the date of closing the transfer books for the
determination of the shareholders entitled to such dividend, distribution,
convertible or exchangeable securities or subscription rights, options or
warrants, or entitled to vote on such proposed dissolution, liquidation, winding
up or sale. Such notice shall specify such record date or the date of closing
the transfer books, as the case may be. Failure to give such notice or any
defect therein shall not affect the validity of any action taken in connection
with the declaration or payment of any such dividend or distribution, or the
issuance of any convertible or exchangeable securities or subscription rights,
options or warrants, or any proposed dissolution, liquidation, winding up or
sale.
 
          13. Notices.

          All notices, requests, consents and other communications hereunder
shall be in writing and shall be deemed to have

                                      -23-

<PAGE>

been duly made when delivered, or mailed by registered or certified mail, return
receipt requested:

               (a) If to a registered Holder of the Warrants, to the address of
          such Holder as shown on the books of the Company; or

               (b) If to the Company, to the address set forth in Section 3 of
          this Agreement or to such other address as the Company may designate
          by notice to the Holders.

          14. Supplements and Amendments.

          The Company and the Underwriter may from time to time supplement or
amend this Agreement without the approval of any Holders of Warrant Certificates
in order to cure any ambiguity, to correct or supplement any provision contained
herein which may be defective or inconsistent with any provisions herein, or to
make any other provisions in regard to matters or questions arising hereunder
which the Company and the Underwriter may deem necessary or desirable and which
the Company and the Underwriter deem not to adversely affect the interests of
the Holders of Warrant Certificates.

          15. Successors.

          All the covenants and provisions of this Agreement by or for the
benefit of the Company and the Holders inure to the benefit of their respective
successors and assigns hereunder.

          16. Termination.

          This Agreement shall terminate at the close of business on __________,
2006. Notwithstanding the foregoing, this Agree-

                                      -24-
<PAGE>

ment will terminate on any earlier date when all Warrants have been exercised
and all the Shares issuable upon exercise of the Warrants have been resold to
the public; provided, however, that the provisions of Section 7 shall survive
any termination pursuant to this Section 16 until the close of business on
_________, 2009.

          17. Governing Law.

          This Agreement and each Warrant Certificate issued hereunder shall be
deemed to be a contract made under the laws of the State of New York and for all
purposes shall be construed in accordance with the laws of said State.

          18. Benefits of This Agreement.

          Nothing in this Agreement shall be construed to give to any person or
corporation other than the Company and the Underwriter and any other registered
holder or holders of the Warrant Certificates, Warrants or the Shares any legal
or equitable right, remedy or claim under this Agreement; and this Agreement
shall be for the sole and exclusive benefit of the Company and the Underwriter
and any other holder or holders of the Warrant Certificates, Warrants or the
Shares.

          19. Counterparts.

          This Agreement may be executed in any number of counterparts and each
of such counterparts shall for all purposes be deemed to be an original, and
such counterparts shall together constitute but one and the same instrument.

                                      -25-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed, as of the day and year first above written.


[SEAL]                                      NETWORK-1 SECURITY SOLUTIONS, INC.



                                            By:
                                               --------------------------------
                                               Name:
                                               Title:

Attest:


- -----------------------




                                            WHALE SECURITIES CO., L.P.

                                            By:  Whale Securities Corp.,
                                                 General Partner



                                            By:
                                               --------------------------------
                                               Name:
                                               Title:


                                      -26-

<PAGE>

                                                                       EXHIBIT A

THE WARRANTS REPRESENTED BY THIS CERTIFICATE AND THE OTHER SECURITIES ISSUABLE
UPON EXERCISE THEREOF HAVE NOT BEEN REGISTERED FOR PURPOSES OF PUBLIC
DISTRIBUTION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), AND MAY
NOT BE OFFERED OR SOLD EXCEPT (i) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE ACT, (ii) TO THE EXTENT APPLICABLE, PURSUANT TO RULE 144
UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT RELATING TO THE DISPOSITION
OF SECURITIES), OR (iii) UPON THE DELIVERY BY THE HOLDER TO THE COMPANY OF AN
OPINION OF COUNSEL, REASONABLY SATISFACTORY TO COUNSEL FOR THE COMPANY, STATING
THAT AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS AVAILABLE.

THE TRANSFER OR EXCHANGE OF THE WARRANTS REPRESENTED BY THIS CERTIFICATE IS
RESTRICTED IN ACCORDANCE WITH THE WARRANT AGREE- MENT REFERRED TO HEREIN.

                            EXERCISABLE ON OR BEFORE
                    5:00 P.M., NEW YORK TIME, _________, 2003

No. W-1                                                         170,000 Warrants
                               WARRANT CERTIFICATE

          This Warrant Certificate certifies that Whale Securities Co., L.P. or
registered assigns, is the registered holder of 170,000 Warrants to purchase, at
any time from _______, 1999 until 5:00 P.M. New York City time on ________, 2003
("Expiration Date"), up to 170,000 fully-paid and non-assessable shares
("Shares") of common stock, par value $.01 per share (the "Common Stock"), of
Network-1 Security Solutions, Inc., a Delaware corporation (the "Company"), at
the initial exercise price, subject to adjustment in certain events (the
"Exercise Price"), of $9.30 per Share upon surrender of this Warrant Certificate
and payment of the Exercise Price at an office or agency of the Company, but
subject to the conditions set forth herein and in the warrant agreement dated as
of ____________, 1998 between the Company and Whale Securities Co., L.P. (the
"Warrant Agreement"). Payment of the Exercise Price may be made in cash, or by
certified or official bank check in New York Clearing House funds payable to the
order of the Company, or any combination thereof.

          No Warrant may be exercised after 5:00 P.M., New York City time, on
the Expiration Date, at which time all Warrants evidenced hereby, unless
exercised prior thereto, shall thereafter be void.

          The Warrants evidenced by this Warrant Certificate are part of a duly
authorized issue of Warrants issued pursuant to the Warrant Agreement, which
Warrant Agreement is hereby incorporated by reference in and made a part of this
instrument and is hereby referred to in a description of the rights,

<PAGE>

limitation of rights, obligations, duties and immunities thereunder of the
Company and the holders (the words "holders" or "holder" meaning the registered
holders or registered holder) of the Warrants.

          The Warrant Agreement provides that upon the occurrence of certain
events, the Exercise Price and the type and/or number of the Company's
securities issuable thereupon may, subject to certain conditions, be adjusted.
In such event, the Company will, at the request of the holder, issue a new
Warrant Certificate evidencing the adjustment in the Exercise Price and the
number and/or type of securities issuable upon the exercise of the Warrants;
provided, however, that the failure of the Company to issue such new Warrant
Certificates shall not in any way change, alter, or otherwise impair, the rights
of the holder as set forth in the Warrant Agreement.

          Upon due presentment for registration of transfer of this Warrant
Certificate at an office or agency of the Company, a new Warrant Certificate or
Warrant Certificates of like tenor and evidencing in the aggregate a like number
of Warrants shall be issued to the transferee(s) in exchange for this Warrant
Certificate, subject to the limitations provided herein and in the Warrant
Agreement, without any charge except for any tax, or other governmental charge
imposed in connection therewith.

          Upon the exercise of less than all of the Warrants evidenced by this
Certificate, the Company shall forthwith issue to the holder hereof a new
Warrant Certificate representing such number of unexercised Warrants.

          The Company may deem and treat the registered holder(s) hereof as the
absolute owner(s) of this Warrant Certificate (notwithstanding any notation of
ownership or other writing hereon made by anyone), for the purpose of any
exercise hereof, and of any distribution to the holder(s) hereof, and for all
other purposes, and the Company shall not be affected by any notice to the
contrary.

          All terms used in this Warrant Certificate which are defined in the
Warrant Agreement shall have the meanings assigned to them in the Warrant
Agreement.

          IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be duly executed under its corporate seal.

Dated: ___________, 1998                NETWORK-1 SECURITY SOLUTIONS, INC.

[SEAL]                                      By:
                                               -------------------------------
                                               Name:
                                               Title:
Attest:
- ----------------------


<PAGE>

                         [FORM OF ELECTION TO PURCHASE]

          The undersigned hereby irrevocably elects to exercise the right,
represented by this Warrant Certificate, to purchase _________ shares of Common
Stock and herewith tenders in payment for such securities cash or a certified or
official bank check payable in New York Clearing House Funds to the order of
Network- 1 Security Solutions, Inc. in the amount of $ , all in accordance with
the terms hereof. The undersigned requests that a certificate for such
securities be registered in the name of , whose address is __________________,
and that such Certificate be delivered to __________________, whose address is
_____________.


Dated:                                  Signature:
                                                  -----------------------------

                                        (Signature must conform in all 
                                        respects to name of holder as 
                                        specified on the face of the 
                                        Warrant Certificate.)

                        --------------------------------

                        --------------------------------
                        (Insert Social Security or Other
                         Identifying Number of Holder)


<PAGE>



                              [FORM OF ASSIGNMENT]

             (To be executed by the registered holder if such holder
                  desires to transfer the Warrant Certificate.)


          FOR VALUE RECEIVED___________________________________________________
hereby sells, assigns and transfers unto
_______________________________________________________________________________
(Please print name and address of transferee)
this Warrant Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint _______________, Attorney, to
transfer the within Warrant Certificate on the books of the within-named
Company, with full power of substitution.


Dated:                                     Signature:
                                                     --------------------------
                                           (Signature must conform in all
                                           respects to name of holder as
                                           specified on the face of the
                                           Warrant Certificate)


- -------------------------------

- -------------------------------
(Insert Social Security or Other
Identifying Number of Assignee)





<PAGE>

                                                                    Exhibit 3.1


                           CERTIFICATE OF DESIGNATION
                           OF SERIES C PREFERRED STOCK

                       NETWORK-1 SECURITY SOLUTIONS, INC.

                 -----------------------------------------------

                     Pursuant to Section 242 of the General
                    Corporation Law of the State of Delaware

                 -----------------------------------------------

     We, the undersigned, Avi A. Fogel, being the President and Chief Executive
Officer of Network-1 Security Solutions, Inc. ("Corporation") and Robert Russo,
Secretary of the Corporation, hereby certify pursuant to Section 151(g) of the
General Corporation Law of the State of Delaware that:

     1. The name of the Corporation is Network-1 Security Solutions, Inc.

     2. The Certificate of Incorporation of the Corporation was filed with the
Department of State on July 13, 1990, an Amended and Restated Certificate of
Incorporation was filed with the Department of State on February 28, 1994, and
Certificates of Amendment to the Certificate of Incorporation were filed with
the Department of State on March 16, 1994, May 18, 1998, and July 20, 1998,
respectively.

     3. Pursuant to authority thereby vested in the Board of Directors by
Article IV of the Corporation's Amended and Restated Certificate of
Incorporation, the Board of Directors adopted the following resolutions on
October ___, 1998 establishing a series of 750,000 shares of Preferred Stock of
the Corporation:

     RESOLVED, that pursuant to Section 151(g) of the General Corporation Law of
the State of Delaware and Article IV of the Corporation's Amended and Restated
Certificate of Incorporation, there is hereby established a series of the
Corporation's Preferred Stock having the following terms and designations:

     Section 1. Designation and Amount. The shares of such series having a par
value of $0.01 per share shall be designated as "Series C Convertible Preferred
Stock" (the "Series C Preferred Stock") and the number of shares constituting
such series shall be 750,000. The relative rights, preferences and limitations
of the Series C Preferred Stock shall be in all respects identical, share for
share, to the Common Stock of the Corporation, except as otherwise provided
herein.

     Section 2. Dividends. The holders of Series C Preferred Stock shall be
entitled to receive dividends and other distributions when, as and if declared
by the Board of Directors out 

<PAGE>

of funds legally available for such purposes. If at any time the Corporation
declares any dividend or other distribution on its Common Stock and there are
shares of its Series C Preferred Stock issued and outstanding, then a dividend
or other distribution shall also be declared on the Series C Preferred Stock
payable at the same time and on the same terms and conditions, entitling each
holder of Series C Preferred Stock to receive the dividend or distribution such
holder would have received had such holder converted the Series C Preferred
Stock as of the record date for determining stockholders entitled to receive
such dividend or distribution.

     Section 3. Voting Rights. Except as otherwise provided by the General
Corporation Law of the State of Delaware, the Series C Preferred Stock and the
Common Stock of the Corporation shall vote as one class, with the holder of each
share of Series C Preferred Stock entitled to the number of votes equal to the
number of shares of Common Stock into which such share of Series C Preferred
Stock could have been converted as of the record date for determining the
stockholders having notice of and to vote at such meeting.

     Section 4. Reacquired Shares. Any shares of the Series C Preferred Stock
redeemed or purchased or otherwise acquired by the Corporation in any manner
whatsoever shall be retired and cancelled promptly after the acquisition
thereof. All such shares shall upon their cancellation become authorized but
unissued shares of Preferred Stock, unless otherwise provided for in the
Certificate of Incorporation of the Corporation, and may be reissued as part of
a new series of Preferred Stock to be created by resolution or resolutions of
the Board of Directors, subject to the conditions or restrictions on issuance
set forth herein.

     Section 5. Liquidation, Dissolution or Winding Up.

     (A) Upon the liquidation, dissolution or winding up of the Corporation, no
distribution shall be made (i) to the holders of stock ranking junior (either as
to dividends or upon liquidation, dissolution or winding up) to the Series C
Preferred Stock unless, prior thereto, the holders of Series C Preferred Stock
shall have received a liquidation preference of $5.25 per share, plus an amount
equal to unpaid dividends thereon, if any, including accrued dividends, whether
or not declared, to the date of such payment or (ii) to the holders of stock
ranking on a parity (either as to dividends or upon liquidation, dissolution or
winding up) with the Series C Preferred Stock, except distributions made ratably
on the Series C Preferred Stock and all other such parity stock in proportion to
the total amounts to which the holders of all such shares are entitled upon such
liquidation, dissolution or winding up. For purposes of this Certificate, (1)
the sale, conveyance, exchange or transfer of all or substantially all of the
property and assets of the Corporation, or (2) the consolidation or merger of 
the Corporation with or into any other corporation (in which the Corporation
is not the surviving entity) shall be deemed to be a liquidation, dissolution 
or winding up of the Corporation within the meaning of this Section 5(A) if 
so elected by a majority of the outstanding shares of Series C Preferred Stock, 
in their sole discretion.

                                       2
<PAGE>

     For purposes of this Certificate the term "junior stock" shall mean the
Common Stock and any other class or series of shares of the Corporation
hereafter authorized over which Series C Preferred Stock has preference or
priority in the payment of dividends or in the distribution of assets on any
liquidation, dissolution or winding up of the Corporation.

     (B) Upon liquidation, dissolution or winding up of the Corporation, and
after full payment as provided in Section 5(A) above, the holders of Series C
Preferred Stock shall not be entitled to any further participation in any
distribution of assets by the Corporation.

     Section 6. Conversion.

     (A) Subject to the provisions for adjustments hereinafter set forth, each
share of the Series C Preferred Stock shall be convertible, at any time
hereafter, at the option of the holder thereof, in the manner hereinafter set
forth, into one fully paid and non-assessable share of Common Stock of the
Corporation.

     (B) The number of shares of Common Stock into which each share of Series C
Preferred Stock is convertible shall be adjusted from time to time as follows:

          (i)  In case the Company shall (a) subdivide the outstanding shares of
               its Common Stock into a larger number of shares, (b) combine the
               outstanding shares of its Common Stock into a smaller number of
               shares or (c) issue by reclassification of its Common Stock any
               shares of the Company, each holder of Series C Preferred Stock
               shall thereafter be entitled upon conversion to receive for each
               share of Series C Preferred Stock held by him the number of
               shares of the Company which he would have owned or have been
               entitled to receive after the happening of one of the events
               described above in this clause (i) had such share of Series C
               Preferred Stock been converted immediately prior to the happening
               of such event. Such adjustment shall become effective on the day
               next following the day upon which such subdivision, combination
               or reclassi-fication shall become effective.

          (ii) In case the Company shall consolidate or merge into or with
               another corporation, or in case the Company shall sell or convey
               to any other person or persons all or substantially all the
               property of the Company, or in case the Company shall effect a
               capital reorganization or reclassification of its Common Stock,
               each holder of Series C Preferred Stock then outstanding shall
               have the right thereafter to convert each share of Series C
               Preferred Stock held by him into the kind and amount of shares 

                                       3
<PAGE>

               of stock, other securities, cash, and property receivable upon
               such consolidation, merger, sale, conveyance, reorganization or
               reclassification by a holder of the number of shares of Common
               Stock into which such share might have been converted immediately
               prior to such consolidation, merger, sale, conveyance,
               reorganization or reclassification and shall no other conversion
               rights. In any such event, effective provision shall be made, in
               the certificate or articles or incorporation of the resulting or
               surviving corporation or otherwise or in any contracts of sale
               and conveyance so that, so far as appropriate and as nearly as
               reasonably may be, the provisions set forth herein for the
               protection of the conversion rights of the shares of Series C
               Preferred Stock shall thereafter be made applicable.

               Such adjustments shall be made successively whenever any event
               listed above shall occur.

     (C) In the event that at any time, as a result of an adjustment made
pursuant to this Section 6, the holder of any share of Series C Preferred Stock
thereafter converted shall become entitled to receive any shares of capital
stock or other securities of the Company other than shares of its Common Stock,
thereafter the number of such other shares of capital stock or other securities
so receivable upon conversion of Series C Preferred Stock shall be subject to
adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions with respect to shares of the Company's Common
Stock contained in this Section 6, and the provisions of this certificate with
respect to shares of the Company's Common Stock shall apply, to the extent
applicable, on like terms to any such other shares of capital stock or warrants
or other securities.

     (D) If any adjustment in the number of shares of Common Stock into which
each share of the Series C Preferred Stock may be converted as required pursuant
to this Section 6 would result in an increase or decrease of less than 1% in the
number of shares of Common Stock into which each share of the Series C Preferred
Stock is then convertible, the amount of any such adjustment shall be carried
forward, and adjustment with respect thereto shall be made at the time of and
together with any subsequent adjustment which, together with such amount and any
other amount or amounts so carried forward, shall aggregate at least 1% of the
number of shares of Common Stock into which each share of the Series C Preferred
Stock is then convertible. All calculations under this Section 6(D) shall be
made to the nearest one-hundredth of a share.

     (E) The Board of Directors may, but shall not be required to, increase the
number of shares of Common Stock into which each share of the Series C Preferred
Stock may be converted, in addition to the adjustment required by this Section
6, as shall be determined by it (as evidenced by a resolution of the Board of
Directors) to be advisable in order to avoid or diminish any income deemed to be
received by any holder of the Common Stock or Series C Preferred Stock


                                        4

<PAGE>

resulting from any dividend or distribution of stock or issuance of rights or
warrants to purchase or subscribe for stock or from any event treated as such
for federal income tax purposes.

     (F) The holder of any shares of the Series C Preferred Stock may exercise
his or its option to convert such shares into shares of Common Stock by
surrendering for such purpose to the Corporation, at its principal office or at
such other office or agency maintained by the Corporation for that purpose, a
certificate or certificates representing the shares of Series C Preferred Stock
to be converted accompanied by a written notice stating that such holder elects
to convert all or a specified whole number of such shares in accordance with the
provisions of this Section 6 and specifying the name or names in which such
holder wishes the certificate or certificates for shares of Common Stock to be
issued. In case such notice shall specify a name or names other than that of
such holder, such notice shall be accompanied by payment of all transfer taxes
payable upon the issuance of shares of Common Stock in such name or names. As
promptly as practicable, and in any event within five business days after the
surrender of such certificates and the receipt of such notice relating thereto
and, if applicable, payment of all transfer taxes, the Corporation shall deliver
or cause to be delivered (a) certificates representing the number of validly
issued, fully paid and non-assessable shares of Common Stock of the Corporation
to which the holder of the Series C Preferred Stock so converted shall be
entitled and (b) if less than the full number of shares of the Series C
Preferred Stock evidenced by the surrendered certificate or certificates, of
like tenor, for the number of shares evidenced by such surrendered certificate
or certificates less the number of shares converted. Such conversions shall be
deemed to have been made at the close of business on the date of giving of such
notice and of such surrender of the certificate or certificates representing the
shares of the Series C Preferred Stock to be converted so that the rights of the
holder thereof shall cease except for the right to receive Common Stock of the
Corporation in accordance herewith, and the converting holder shall be treated
for all purposes as having become the record holder of such Common Stock of the
Corporation at such time.

     (G) Upon conversion of any shares of the Series C Preferred Stock, the
holder thereof shall not be entitled to receive any accumulated, accrued or
unpaid dividends in respect of the shares so converted, provided that such
holder shall be entitled to receive any dividends on such shares of the Series C
Convertible Preferred Stock declared prior to such conversion if such holder
held such shares on the record date fixed for the determination of holders of
the Series C Preferred Stock entitled to receive payment of such dividend.

     (H) The transfer of shares of Series C Preferred Stock by any holder shall
constitute an automatic conversion of such shares into Common Stock in
accordance with 6(A) hereof; provided, that, the holder of Series C Preferred
Stock may transfer such shares without triggering such automatic conversion if a
transfer is made to (i) the holder's spouse, children or issue, trustee of
trusts or custodians for his benefit or for the benefit of his spouse, children
or issue, or (ii) any entity controlled by or under common control with such
holder or his spouse, children or issue or (iii) by operation of law pursuant to
rights of testacy and intestacy.

                                        5

<PAGE>

     (I) The Corporation shall at all times reserve and keep available out of
its authorized Common Stock the full number of shares of Common Stock of the
Corporation or other securities issuable upon the conversion of all outstanding
shares of the Series C Preferred Stock.

     Section 7. Adjustments for Consolidation, Merger, etc. Prior to the
consummation of a consolidation or merger or a sale of substantially all of the
property of the Company as described in Section 6 (B)(ii) hereof, each
corporation, including this Corporation, which may be required to deliver any
stock, securities cash or other property to the holders of shares of the Series
C Preferred Stock shall assume, by written instrument delivered to each transfer
agent of the Series C Preferred Stock, the obligation to deliver to such holder
such shares of stock, securities, cash or other property to which, in accordance
with the provisions of Section 6, such holder may be entitled and each such
corporation shall have furnished to each such transfer agent or person acting in
a similar capacity, including the Corporation, an opinion of counsel for such
corporation, stating that such assumption agreement is legal, valid and binding
upon such corporation.

     Section 8. Reports as to Adjustments. Whenever the number of shares of
Common stock into which the shares of the Series C Preferred Stock are
convertible is adjusted as provided in Section 6, the Corporation shall (A)
promptly compute such adjustment and furnish to each transfer agent or person
acting in a similar capacity, including the Corporation, for the Series C
Preferred Stock, a certificate, signed by a principal financial officer of the
Corporation, setting forth the number of shares of Common Stock into which each
share of Series C Preferred Stock is convertible as a result of such adjustment
and the computation thereof and when such adjustment will become effective and
(B) promptly mail to the holders of record of the outstanding shares of the
Series C Preferred Stock a notice stating that the number of shares into which
the shares of Series C Preferred Stock are convertible has been adjusted and
setting forth the new number of shares into which each share of the Series C
Preferred Stock is convertible as a result of such adjustment and when such
adjustment will become effective.

     Section 9. Notices of Corporate Action. In the event of:

     (A) any taking by the Corporation of a record of the holders of its Common
Stock for the purpose of determining the holders thereof who are entitled to
receive any dividend (other than a dividend payable solely in cash or shares of
common stock) or other distribution, or any right or warrant to subscribe for,
purchase or otherwise acquire any shares of stock of any class or any other
securities or property, or to receive any other right;

     (B) any capital reorganization, reclassification or recapitalization of the
Corporation (other than a subdivision or combination of the outstanding shares
of its common stock), any consolidation or merger involving the Corporation and
any other person (other than a consolidation or merger with a wholly-owned
subsidiary of the Corporation, provided that the Corporation is the surviving or
the continuing corporation and no change occurs in the common

                                        6

<PAGE>

stock), or any transfer of all or substantially all the assets of the
Corporation to any other person; or 


     (C) any voluntary or involuntary dissolution, liquidation or winding up of
the Corporation;

     then, and in each such case, the Corporation shall cause to be mailed to
each transfer agent for the shares of the Series C Preferred stock and to the
holders of record of the outstanding shares of the Series C Preferred Stock, at
least 20 days (or 10 days in case of any event specified in clause (A) above)
prior to the applicable record or effective date thereinafter specified, a
notice stating (i) the date or expected date on which any such record is to be
taken for the purpose of such dividend, distribution or right or (ii) the date
or expected date to which any such reorganization, reclassification,
recapitalization, consolidation, merger, transfer, dissolution, liquidation or
winding up is to take place and the time, if any such time is to be fixed, as of
which the holders of record of Common Stock shall be entitled to exchange their
shares of Common Stock for the securities or other property deliverable upon
such reorganization, reclassification, recapitalization, consolidation, merger,
transfer, dissolution, liquidation or winding up. Such notice shall also state
whether such transaction will result in any adjustment in the number of shares
of Common Stock into which each share of the Series C Preferred Stock shall be
convertible upon such adjustment and when such adjustment will become effective.
The failure to give any notice required by this Section 9, or any defect
therein, shall not affect the legality or validity of any such action requiring
such notice.

     IN WITNESS WHEREOF, the undersigned, being the President and Secretary of
the Corporation, do hereby execute this Certificate of Designation, here
declaring that this is their free act and deed and that the facts stated herein
are true and accordingly have hereunto set their hands as of this ____ day of
October, 1998.

                                        NETWORK-1 SECURITY SOLUTIONS, INC.


                                        By:      
                                           ------------------------------------
                                               Avi A. Fogel, President
                                               and Chief Executive Officer
ATTEST:


- ---------------------------------
Robert Russo, Secretary


                                        7



<PAGE>

                                                                    EXHIBIT 4.2


                          NETWORK-1 SECURITY SOLUTIONS, INC.
                                STOCK OPTION PLAN
                                 (AS AMENDED)

1.   Purpose of Plan

     The purpose of the Stock Option Plan (the "Plan") is to provide an
incentive to Key Employees, Directors and Consultants (as hereinafter defined)
of Network-1 Security Solutions, Inc. (the "Company") who are in a position to
contribute materially to the long term success of the Company, to increase their
interest in the Company's welfare and to aid in attracting and retaining Key
Employees, Directors and Consultants of outstanding ability.

2.   Definitions

          Unless otherwise specified or unless the context otherwise requires,
the following terms, as used in this Stock Option Plan, have the following
meanings:

          a)   "Affiliate" means a corporation which for purposes of Section 422
of the Code, is a parent or subsidiary of the Company, direct or indirect, each
as defined in Section 424 of the Code.

          b)   "Board of Directors" or "Board" means the Board of Directors of
the Company.

          c)   "Code" means the United States Internal Revenue Code of 1986, as
such may be amended from time to time.

          d)   "Compensation Committee" means the committee to which the Board
of Directors delegates the power to act under or pursuant to the provisions of
the Plan, or the Board of Directors if no committee is selected.

          e)   "Company" means Network-1 Security Solutions, Inc., a Delaware
corporation.

          f)   "Consultant" means any person retained by the Company or any of
its Affiliates to render services on a consultant basis.

          g)   "Disability" or "Disabled" means permanent and total disability
as defined in Section 22(e)(3) of the Code.

          h) "Incentive Stock Option" means an Option, as identified below,
which is designated by the Compensation Committee as such and which, when
granted, is intended to be an "incentive stock option" as defined in section 422
of the Code.




<PAGE>




          i)   "Key Employee" means an employee of the Company or of an
Affiliate, (including, without limitation, an employee who is also serving as an
officer or director of the Company or of an Affiliate), designated by the Board
of Directors or the Committee to be eligible to be granted one or more options
under the Plan.

          j)   "Non-Qualified Stock Option" shall mean an Option, as defined
below, which is designated by the Compensation Committee as such and which, when
granted, is not intended to be an "Incentive Stock Option" as defined in Code
Section 422.

          k)   "Option" means a right or option granted under the Plan.

          l)   "Option Agreement" means an agreement between the Company and a
Participant executed and delivered pursuant to the Plan.

          m) "Participant" means a Key Employee to whom one or more Incentive
Stock Options or Non-Qualified Stock Options are granted under the Plan and an
employee, nonemployee director, consultant or independent contractor ("Non Key
Employee") to whom one or more Non-Qualified Stock Options are granted under the
Plan.

          n)   "Plan" means this Stock Option Plan.

          o)   "Shares" means the following shares of the capital stock of 
the Company as to which Options have been or may be granted under the Plan; 
1,050,000 authorized and unissued common stock, ($0.01) par value, including 
fractional shares, any shares of capital stock into which the shares are 
changed or for which they are exchanged within the provisions of Section 9 of 
the Plan.

3.   Aggregate Number of Shares

     1,050,000 Shares of the Company's common stock, par value $.01 per share 
(the "Common Stock"), shall be the aggregate number of Shares which may be 
issued under this Plan. Notwithstanding the foregoing, in the event of any 
change in the outstanding shares of Common Stock of the Company by reason of 
a stock dividend, stock split, combination of shares, recapitalization, 
merger, consolidation, transfer of assets, reorganization, conversion or what 
the Compensation Committee deems in its sole discretion to be similar 
circumstances, the aggregate number and kind of Shares which may be issued 
under this Plan shall be appropriately adjusted in a manner determined in the 
sole discretion of the Compensation Committee.  Reacquired shares of the 
Company's Common Stock, as well as unissued shares, may be used for the 

                                          2
<PAGE>


purpose of this Plan.  Shares of the Company's Common Stock subject to Options
which have terminated unexercised, either in whole or in part, shall be
available for future Options granted under this Plan.

4.   Class of Persons Eligible to Receive Options

     (a)  All Key Employees, as defined in Section 2 above, including officers
          of the Company and of any present or future Company Affiliate, all
          members of the Board of Directors of the Company who are not Key
          Employees (the "Nonemployee Directors") and Consultants to the Company
          and to any present or future Company Affiliate are eligible to receive
          an Option or Options under this Plan.  The individuals who shall, in
          fact, receive an Option or Options under this Plan (the
          "Participants") shall be selected by the Compensation Committee, in
          its sole discretion, except as otherwise specified in Sections 5 and 6
          hereof.

     (b)  Notwithstanding any other provision of this Plan, the aggregate fair
          market value of the Common Stock as to which a holder may exercise
          Incentive Stock Options may not exceed $100,000 in any calendar year.

5.   Administration of Plan

     (a)  This Plan shall be administered by the Compensation Committee of the
          Board of Directors.  Prior to the time at which the stock of the
          Company is required to be registered under Section 12 of the
          Securities Exchange Act of 1934 ("Registration Date"), the
          Compensation Committee shall be composed of all or certain members of
          the Board of Directors as the Board shall determine.  From and after
          the Registration Date, the Compensation Committee shall be composed of
          a minimum of two members of the Board of Directors as the Board shall
          determine, each of whom shall be a "disinterested person" within the
          meaning of Rule 16b-3 (c) (2) (i) under the Securities Exchange Act of
          1934, as amended, of the Securities and Exchange Commission (the
          "SEC") or any future corresponding rule.

     (b)  The Compensation Committee shall, in addition to its other authority
          and subject to the provisions of this Plan, determine the
          Participants, whether the Option shall be an Incentive Stock Option or
          a Non-Qualified Stock Option (as such terms are defined in Section 2),


                                          3
<PAGE>


          the number of Shares to be subject to each of the options, the time or
          times at which the Options shall be granted, the rate of Option
          exercisability, and, subject to Section 6 hereof, the price at which
          each of the Options is exercisable and the duration of the Option.

     (c)  The Compensation Committee shall adopt such rules for the conduct of
          its business and administration of this Plan as it considers
          desirable.  A majority of the members of the Compensation Committee
          shall constitute a quorum for all purposes.  The vote or written
          consent of a majority of the members of the Compensation Committee on
          a particular matter shall constitute the act of the Compensation
          Committee on such matter.  The Compensation Committee shall have the
          right to construe the Plan and the Options issued pursuant to it, to
          correct defects and omissions and to reconcile inconsistencies to the
          extent necessary to effectuate the Plan and the Options issued
          pursuant to it, and such action shall be final, binding and conclusive
          upon all parties concerned.  No member of the Compensation Committee
          or the Board of Directors shall be liable for any act or omission
          (whether or not negligent) taken or omitted in good faith, or for the
          exercise of any authority or discretion granted in connection with the
          Plan to the Compensation Committee or the Board of Directors, or for
          the acts or omissions of any other members of the Compensation
          Committee or the Board of Directors.  Subject to the numerical
          limitations on Compensation Committee membership set forth in Section
          5(a) hereof, the Board of Directors may at any time appoint additional
          members of the Compensation Committee and may at any time remove any
          member of the Compensation Committee with or without cause.  Vacancies
          in the Compensation Committee, however caused, may be filled by the
          Board of Directors, if it so desires.

6.   Incentive Stock Options and Non-Qualified Stock Options

     (a)  Options issued pursuant to this Plan may be either Incentive Stock
          Options granted pursuant to Section 6(b) hereof or Non-Qualified Stock
          Options granted pursuant to Section 6(c) hereof, as determined by the
          Compensation Committee.  The Compensation Committee may grant both an
          Incentive Stock Option and a Non-Qualified Stock Option to the same
          person, or more than one of each type of Option to the same person,
          subject to the restrictions set forth in (b) and (c) below.  


                                          4
<PAGE>


          The Option price for Incentive Stock Options issued under this Plan
          shall be equal at least to the fair market value (as defined below) of
          the Company's Common Stock on the date of the grant of the Option as
          determined by the Compensation Committee in accordance with its
          interpretation of the requirements of Section 422 of the Code and the
          regulations thereunder.  The Option price for Non-Qualified Stock
          Options issued under this Plan may, in the sole discretion of the
          Compensation Committee, be less than the fair market value of the
          Common Stock on the date of the grant of the Option.  If an Incentive
          Stock Option is granted to an individual who, at the time the Option
          is granted, owns stock possessing more than 10% of the total combined
          voting power of all shares of stock of the Company or any parent or
          subsidiary corporation of the Company (a "10% Shareholder"), the
          Option price shall not be less than 110% of the fair market value of
          the Company's Common Stock on the date of grant of the option.  The
          fair market value of the Company's Common Stock on any particular date
          shall mean the last reported sale price of a share of the Company's
          Common Stock on any stock exchange on which such stock is then listed
          or admitted to trading, or on the Nasdaq Stock Market, on such date,
          or if no sale took place on such day, the last such date on which a
          sale took place, or if the Common Stock is not then quoted on the
          Nasdaq Stock Market, or listed or admitted to trading on any stock
          exchange, the average of the bid and asked prices in the
          over-the-counter market on such date, or if none of the foregoing, a
          price determined by the Compensation Committee.

     (b)  Subject to the authority of the Compensation Committee set forth in
          Section 5(b) hereof, Incentive Stock Options issued pursuant to this
          Plan shall be issued only to Key Employees of the Company
          substantially in the form set forth in Appendix A hereof, which form
          is hereby incorporated by reference and made a part hereof, and shall
          contain substantially the terms and conditions set forth therein. 
          Nonemployee Directors and Consultants shall not be eligible for
          Incentive Stock Options.  Incentive Stock Options shall not be
          exercisable after the expiration of ten years (five years in the case
          of 10% Shareholders) from the date such Options are granted, unless
          terminated earlier under the terms of the Option.  At the time of the
          grant of an Incentive Stock Option hereunder, the Compensation
          Committee may, in its discretion, modify or amend any of the Option
          terms contained in Appendix 


                                          5
<PAGE>


          A for any particular Participant, provided that the Option as modified
          or amended satisfies the requirements of Section 422 of the Code and
          the regulations thereunder.  Each of the Options granted pursuant to
          this Section 6(b) is intended, if possible, to be an "Incentive Stock
          Option" as that term is defined in Section 422 of the Code and the
          regulations thereunder.  In the event this Plan or any Option granted
          pursuant to this Section 6(b) is in any way inconsistent with the
          applicable legal requirements of the Code or the regulations
          thereunder for an Incentive Stock Option, this Plan and such Option
          shall be deemed automatically amended as of the date hereof to conform
          to such legal requirements, if such conformity may be achieved by
          amendment.

     (c)  Subject to the authority of the Compensation Committee set forth in
          Section 5(b) hereof, Non-Qualified Stock Options issued pursuant to
          this Plan shall be issued to Participants of the Company substantially
          in the form set forth in Appendix B hereof, which form is hereby
          incorporated by reference and made a part hereof, and shall contain
          substantially the terms and conditions set forth therein. 
          Non-Qualified Stock Options shall expire not more than ten years after
          the date they are granted, unless terminated earlier under the Option
          terms.  At the time of granting a Non-Qualified Stock Option
          hereunder, the Compensation Committee may, in its discretion, modify
          or amend any of the Option terms contained in Appendix B for any
          particular Participant.

     (d)  Neither the Company nor any of its current or future parent,
          subsidiaries or affiliates, nor their officers, directors,
          shareholders, stock option plan committees, the Compensation
          Committees, employees or agents shall have any liability to any
          optionee in the event: (i) an Option granted pursuant to Section 6(b)
          hereof does not qualify as an "Incentive Stock Option" as that term is
          used in Section 422 of the Code and the regulations thereunder; (ii)
          any optionee does not obtain the tax treatment pertaining to an
          Incentive Stock Option; or (iii) any Option granted pursuant to
          Section 6(c) hereof is an "Incentive Stock Option."

7.   Exercise of Option and Issue of Stock

     Options shall be exercised by giving written notice to the Company.  Such
written notice shall: (1) be signed by the person exercising the Option, (2)
state the number of shares and with respect to which the Option, if any, is
being exercised, (3) 


                                          6
<PAGE>


contain the legend required by Appendix A and B, page 5, paragraph (b) therein,
and (4) specify a date (other than a Saturday, Sunday or legal holiday) not less
than five (5) nor more than ten (10) days after the date of such written notice,
as the date on which the Shares will be taken up and payment made therefor.  The
conditions specified above may be waived in the sole discretion of the Company. 
Such tender and conveyance shall take place at the principal office of the
Company during ordinary business hours, or at such other hour and place agreed
upon by the Company and the person(s) exercising the Option.  On the date
specified in such written notice (which date may be extended by the Company in
order to comply with any law or regulation which requires the Company to take
any action with respect to the Option Shares prior to issuance thereof) the
Company shall accept payment for the Option Shares (in the forms set forth
below) and shall deliver to the person(s) exercising the Option in exchange
therefor a certificate or certificates for fully paid non-assessable shares.  In
the event of any failure to take up and pay for the number of Shares specified
in such written notice of the exercise of the Option on the date set forth
therein (or on the extended date as above provided) the exercise of the Option
shall terminate with respect to such number of Shares, but shall continue with
respect to the remaining Shares covered by the Option and not yet acquired
pursuant thereto.

     The payment may be in any of the following forms: (a) cash, which may be
evidenced by a check; (b) certificates representing shares of Common Stock of
the Company, which will be valued by the Secretary of the Company at the fair
market value per share of the Company's Common Stock (as determined in
accordance with the Plan) on the last trading day immediately preceding the date
of delivery of such certificates to the Company, accompanied by an assignment of
the stock to the Company, or (c) any combination of cash and Common Stock of the
Company valued as provided in clause (b).  Any assignment of stock shall be in a
form and substance satisfactory to the Secretary of the Company, including
guarantees of signature(s) and payment of all transfer taxes if the Secretary
deems such guarantees necessary or desirable or determines that such taxes are
due and payable.

8.   Assignability and Transferability of Option  

     By its terms, an Option granted to a Participant shall not be transferable
by the Participant otherwise than by will or the laws of descent and
distribution, and shall be exercisable, during the Participant's lifetime only
by such Participant and Participant's legal guardian or custodian in the event
of disability.  Any attempted transfer, assignment, pledge, hypothecation or
other disposition of any Option or of any rights granted thereunder, otherwise
than by will or the laws of descent 


                                          7
<PAGE>


and distribution, or the levy of any attachment or similar process upon an
Option or such rights, shall be null and void.

9.   Adjustments Upon Changes in Capitalization

     In the event that the authorized and outstanding shares of Common Stock of
the Company are changed into or exchanged for a different number or kind of
shares or other securities of the Company or of another corporation by reason of
any reorganization, merger, consolidation, recapitalization, reclassification,
change in par value, stock split-up, combination of shares or dividend payable
in capital stock, or the like, appropriate adjustments to prevent dilution or
enlargement of the rights granted to or available for, Participants, shall be
made in the manner and kind of shares for the purpose of which Options may be
granted under the Plan, and, in addition, appropriate adjustment shall be made
in the number and kind of shares and in the option price per share subject to
outstanding Options.  No such adjustment shall be made which shall, within the
meaning of Section 424 of the Code, constitute such a modification, extension or
renewal of an Incentive Stock Option as to cause it to be considered as the
grant of a new Incentive Stock Option.

10.  Modification, Amendment, Suspension and Termination

     Options shall not be granted pursuant to this Plan after the expiration of
ten years from the date the Plan is adopted by the Board of Directors of the
Company.  The Board of Directors reserves the right at any time, and from time
to time, to modify or amend this Plan in any way, or to suspend or terminate it,
effective as of such date, which date may be either before or after the taking
of such action, as may be specified by the Board of Directors; provided,
however, that such action shall not affect Options granted under the Plan prior
to the actual date on which such action occurred.  If a modification or
amendment of this Plan is required by the Code or the regulations thereunder to
be approved by the shareholders of the Company in order to permit the granting
of Incentive Stock Options pursuant to the modified or amended Plan, such
modification or amendment shall also be approved by the shareholders of the
Company in such manner as is prescribed by the Code and the regulations
thereunder.  If the Board of Directors voluntarily submits a proposed
modification, amendment, suspension or termination for shareholder approval,
such submission shall not require any future modifications, amendments,
suspensions or terminations (whether or not relating to the same provision or
subject matter) to be similarly submitted for shareholder approval. 

11.  Effectiveness of Plan


                                          8
<PAGE>



     This Plan shall become effective on the date of its adoption by the
Company's Board of Directors, subject however to approval by the holders of the
Company's Common Stock in the manner as prescribed in the Code and the
regulations thereunder.  Options may be granted under this Plan prior to
obtaining shareholder approval, provided such Options shall not be exercisable
before 
such shareholder approval is obtained.

12.  Indemnification of Compensation Committee

     In addition to such other rights of indemnification as they may have as
directors or as members of the Compensation Committee, the members of the
Compensation Committee (or the directors acting with respect to the Plan if
there is no Compensation Committee) shall be indemnified by the Company against
all reasonable expenses, including attorneys fees, actually and reasonably
incurred in connection with the defense of any action, suit or proceeding, or in
connection with any appeal therein to which they or any of them may be a party
by reason of any action taken by them as members of the Compensation Committee
and against all amounts paid by them in settlement thereof (provided such
settlement is approved by legal counsel selected by the Company) or paid by them
in satisfaction of a judgment in any such action, suit or proceeding, except in
relation to matters as to which it shall be adjudged in such action, suit or
proceeding that such Compensation Committee member is liable for gross
negligence or willful misconduct in the performance of his or her duties.  To
receive such indemnification, a Compensation Committee member must first offer
in writing to the Company the opportunity, at its own expense, to defend any
such action, suit or proceeding.

13.  General Conditions

     (a)  Nothing contained in this Plan or any Option granted pursuant to this
          Plan shall confer upon any employee the right to continue in the
          employ of the Company or any present or future parent, affiliated or
          subsidiary corporation or interfere in any way with the rights of the
          Company or any present or future parent, affiliated or subsidiary
          corporation to terminate his employment in any way.

     (b)  Corporate action constituting an offer of stock for sale to any
          employee under the terms of the Options to be granted hereunder shall
          be deemed complete as of the date when the Compensation Committee
          authorizes the grant of the Option to the employee, regardless of when
          the Option is actually delivered to the employee or acknowledged or
          agreed to by him.


                                          9
<PAGE>



     (c)  If the Company's Common Stock has not been registered under Section 12
          of the Securities Exchange Act of 1934, the exercise of an Option will
          not be effective unless and until the Option holder executes and
          delivers to the Company a Stock Restriction Agreement, in the form on
          file in the office of the Secretary of the Company.

     (d)  The use of the masculine pronoun shall include the feminine gender
          whenever appropriate.


                                          10
<PAGE>






                                      APPENDIX A

                                INCENTIVE STOCK OPTION


To:  --------------------------------------------------------------
                                         Name

     --------------------------------------------------------------
                                       Address

Date of Grant: ------------------------------


     You are hereby granted an option* (the "Option"), effective as of the date
hereof, to purchase ___ shares of Common Stock, par value $.01 per share
("Common Stock"), of Network-1 Security Solutions, Inc. (the "Company") at a
price of ___ per share pursuant to the Company's 1996 Stock Option Plan adopted
by the Company's Board of Directors and Stockholders effective March 7, 1996, as
amended (the "Plan").  Your option price is intended to equal at least the fair
market value of the Company's Common Stock as of the date hereof; provided,
however, that if, at the time this option is granted, you own stock possessing
more than 10% of the total combined voting power of all shares of stock of the
Company or any parent or subsidiary (an "Affiliate") of the Company (a "10%
Shareholder"), your option price is intended to be at least 110% of the fair
market value of the Company's Common Stock as of the date hereof.

     Your Option may first be exercised on and after [one year from the date of
grant], but not before that time.  Your Option may be exercised either: (i) on
and after ___________ and prior to the Termination Date (as hereinafter
defined), for up to _____% of the total number of shares subject to the Option
minus the number of shares previously purchased by exercise of the Option (as
adjusted for any change in the outstanding shares of the Common Stock of the
Company, by reason of a stock dividend, stock split, combination of shares,
recapitalization, merger, consolidation, transfer of assets, reorganization,
conversion or what the Compensation Committee deems in its sole discretion to be
similar circumstances); or (ii) each succeeding year thereafter and prior to the
Termination Date (as hereinafter defined) for up to an additional [twenty (20%)
percent] of the total number of shares subject to the Option minus the number of
shares previously purchased by exercise of the Option (as adjusted for any
change in the outstanding shares of the Common Stock of the Company by reason of
a stock dividend, stock split, combination of shares, recapitalization, merger,
consolidation, transfer of assets, reorganization, conversion or what the
Compensation Committee deems 



<PAGE>



in its sole discretion to be similar circumstances). No fractional shares shall
be issued or delivered.



* This Incentive Stock Option is to be issued only to Key Employees of the
Company.  Nonemployee Directors and Consultants are not eligible for this
option.

     This Option shall terminate and is not exercisable after the expiration of
ten years from the date of its grant (five years from the date of grant if, at
the time of the grant, you are a 10% Shareholder) (the "Scheduled Termination
Date"), except if terminated earlier as hereinafter provided (the "Termination
Date").

     In the event of a "change of control" (as hereafter defined) of the
Company, your Option may, from and after the date of the change of control, and
notwithstanding the second paragraph of this option, be exercised for up to 100%
of the total number of shares then subject to the Option minus the number of
shares previously purchased upon exercise of the Option (as adjusted for any
changes in the outstanding Common Stock by reason of a stock dividend, stock
split, combination of shares, recapitalization, merger, consolidation, transfer
of assets, reorganization, conversion or what the Compensation Committee deems
in its sole discretion to be similar circumstances).

     A "change of control" shall be deemed to have occurred upon the happening
of any of the following events:

     1.   A change within a twelve-month period in a majority of the members of
the Board of Directors of the Company;

     2.   A change within a twelve-month period in the holders of more than 50%
of the outstanding voting stock of the Company; or

     3.   Any other event deemed to constitute a "change in control" by the
Compensation Committee.

     You may exercise your option as set forth in Section 7 of the Plan. 

     If the Company's Common Stock has not been registered under Section 12 of
the Securities Exchange Act of 1934, the exercise
of your option will not be effective unless and until you execute and deliver to
the Company a Stock Restriction Agreement, in the form on file in the office of
the Secretary of the Company.

     Your Option will, to the extent not previously exercised by 


                                          2
<PAGE>


you, terminate thirty (30) days after the date on which your employment by the
Company or Affiliate of the Company is terminated, whether such termination is
voluntary or not, other than by reason of disability as defined in Section
22(e)(3) of the Internal Revenue Code of 1986, as amended (the "Code"), and the
regulations thereunder, or death, in which case your Option will terminate six
(6) months from the date of termination of employment due to disability or death
(but in no event later than the Scheduled Termination Date).  After the date
your employment is terminated, as aforesaid, you may exercise this Option only
for the number of shares which you had a right to purchase and did not purchase
on the date your employment terminated.  If you are employed by an Affiliate of
the Company, your employment shall be deemed to have terminated on the date your
employer ceases to be an Affiliate of the Company, unless you are on that date
transferred to the Company or another Affiliate of the Company.  Your employment
shall not be deemed to have terminated if you are transferred from the Company
to an Affiliate, or vice versa, or from one Affiliate to another Affiliate.

     Anything in this Option to the contrary notwithstanding, your option will
terminate immediately if your employment is terminated for cause (as determined
by the Company in its sole and absolute discretion).  Your employment shall be
deemed to have been terminated for cause if you are terminated due to, among
other reasons, (i) your willful misconduct or gross negligence, (ii) your
material breach of any agreement with the Company or (iii) your failure to
render satisfactory services to the Company.

     If you die while employed by the Company or an Affiliate of the Company,
your legatee(s), distributee(s), executor(s) or administrator(s), as the case
may be, may, at any time within six (6) months after the date of your death (but
in no event later than the Scheduled Termination Date), exercise the Option as
to any shares which you had a right to purchase and did not purchase during your
lifetime.  If your employment with the Company, or an Affiliate is terminated by
reason of your becoming disabled (within the meaning of Section 22(e)(3) of the
Code and the regulations thereunder), you or your legal guardian or custodian
may at any time within six (6) months after the date of such termination (but in
no event later than the Scheduled Termination Date), exercise the Option as to
any shares which you had a right to purchase and did not purchase prior to such
termination.  Your legatee, distributee, executor, administrator, guardian or
custodian must present proof of his authority satisfactory to the Company prior
to being allowed to exercise this Option.

     This Option is not transferable otherwise than by will or the laws of
descent and distribution, and is exercisable during your lifetime only by you,
including, for this purpose, your legal 


                                          3
<PAGE>


guardian or custodian in the event of disability.  Until the Option price has
been paid in full pursuant to due exercise of this Option and the purchased
shares are delivered to you, you do not have any rights as a shareholder of the
Company.  The Company reserves the right not to deliver to you the shares
purchased by virtue of the exercise of this Option during any period of time in
which the Company deems, in its sole discretion, that such delivery would
violate a federal, state, local or securities exchange rule, regulation or law.

     Notwithstanding anything to the contrary contained herein, this Option is
not exercisable until all of the following events occur and during the following
periods of time:

     (a)  Until the Plan pursuant to which this Option is granted is approved by
the shareholders of the Company in the manner prescribed by the Code and the
regulations thereunder;

     (b)  Until this Option and the optioned shares are approved and/or
registered with such federal, state and local regulatory bodies or agencies and
securities exchanges as the Company may deem necessary or desirable; or

     (c)  During any period of time in which the Company deems that the
exercisability of this Option, the offer to sell the shares optioned hereunder,
or the sale thereof, may violate a federal, state, local or securities exchange
rule, regulation or law, or may cause the Company to be legally obligated to
issue or sell more shares than the Company is legally entitled to issue or sell.

     The following two paragraphs shall be applicable if, on the date of
exercise of this Option, the Common Stock to be purchased pursuant to such
exercise has not been registered under the Securities Act of 1933, as amended,
and under applicable state securities laws, and shall continue to be applicable
for so long as such registration has not occurred:

     (a)  The optionee hereby agrees, warrants and represents that he will
acquire the Common Stock to be issued hereunder for his own account for
investment purposes only, and not with a view to, or in connection with, any
resale or other distribution of any of such shares, except as hereafter
permitted.  The optionee further agrees that he will not at any time make any
offer, sale, transfer, pledge or other disposition of such Common Stock to be
issued hereunder without an effective registration statement under the
Securities Act of 1933, as amended, and under any applicable state securities
laws or an opinion of counsel acceptable to the Company to the effect that the
proposed transaction will be exempt from such registration The optionee shall
execute such instruments, representations, acknowledgements and agreements as
the Company 


                                          4
<PAGE>


may, in its sole discretion, deem advisable to avoid any violation of federal,
state, local or securities exchange rule, regulation or law.
     
     (b)  The certificates for Common Stock to be issued to the optionee
hereunder shall bear the following legend:

          "The shares represented by this certificate have not been registered
          under the Securities Act of 1933, as amended, or under applicable
          state securities laws.  The shares have been acquired for investment
          and may not be offered, sold, transferred, pledged or otherwise
          disposed of without an effective registration statement under the
          Securities Act of 1933, as amended, and under any applicable state
          securities laws or an opinion of counsel acceptable to the Company
          that the proposed transaction will be exempt from such registration."

The foregoing legend shall be removed upon registration of the legended shares
under the Securities Act of 1933, as amended, and under any applicable state
laws or upon receipt of any opinion of counsel acceptable to the Company that
said registration is no longer required.

     The sole purpose of the agreements, warranties, representations and legend
set forth in the two immediately preceding paragraphs is to prevent violations
of the Securities Act of 1933, as amended, and any applicable state securities
laws.

     It is the intention of the Company and you that this option shall, if
possible, be an "Incentive Stock Option" as that term is used in Section 422 of
the Code and the regulations thereunder.  In the event this Option is in any way
inconsistent with the legal requirements of the Code or the regulations
thereunder for an "Incentive Stock Option" this Option shall be deemed
automatically amended as of the date hereof to conform to such legal
requirements, if such conformity may be achieved by amendment.

     This Option shall be subject to the terms of the Plan in effect on the date
this Option is granted, which terms are hereby incorporated herein by reference
and made a part hereof.  In the event of any conflict between the terms of this
Option and the terms of the Plan in effect on the date of this Option, the terms
of the Plan shall govern.  This Option constitutes the entire understanding
between the Company and you with respect to the subject matter hereof and no
amendment, modification or waiver of this Option, in whole or in part, shall be
binding upon the Company unless in writing and signed by an appropriate officer
of the Company.  This Option and the performances of the parties hereunder shall
be construed in accordance with and governed by the laws of 


                                          5
<PAGE>


the State of New York without regard to principles of conflict of law.

     Please sign the copy of this Option and return it to the Company, thereby
indicating your understanding of and agreement with its terms and conditions.

                         NETWORK-1 SECURITY SOLUTIONS, INC.



                         By:  ____________________________


     I hereby acknowledge receipt of a copy of the foregoing Stock Option and
the Network-1 Security Solutions, Inc. 1996 Stock Option Plan, and having read
such documents, hereby signify my understanding of, and my agreement with, their
terms and conditions.



_________________________     ____________________________
(Signature)                   (Date)



                                          6
<PAGE>


                                      APPENDIX B

                              NON-QUALIFIED STOCK OPTION

To:  ______________________________________________________
                         Name

     ______________________________________________________
                         Address

Date of Grant: ____________________________________________


     You are hereby granted an option (the "Option"), effective as of the date
hereof, to purchase _______ shares of Common Stock, par value $.01 per share
("Common Stock"), of Network-1 Security Solutions, Inc. (the "Company") at a
price of ___ per share pursuant to the Company's 1996 Stock Option Plan adopted
by the Company's Board of Directors and Stockholders effective March 7, 1996
(the "Plan"). [Your option price is intended to equal at least the fair market
value of the Company's Common Stock as of the date hereof.]

     Your Option may first be exercised on and after one (1) year from the date
of Grant, but not before that time.  Your Option may be exercised either: (i) on
and after ___________ and prior to the Termination Date (as hereinafter
defined), for up to _____% of the total number of shares subject to the Option
minus the number of shares previously purchased by exercise of the Option (as
adjusted for any change in the outstanding shares of the Common Stock of the
Company, by reason of a stock dividend, stock split, combination of shares,
recapitalization, merger, consolidation, transfer of assets, reorganization,
conversion or what the Compensation Committee deems in its sole discretion to be
similar circumstances); or (ii) each succeeding year thereafter and prior to the
Termination Date (as hereinafter defined) for up to an additional [twenty (20%)
percent] of the total number of shares subject to the Option minus the number of
shares previously purchased by exercise of the Option (as adjusted for any
change in the outstanding shares of the Common Stock of the Company by reason of
a stock dividend, stock split, combination of shares, recapitalization, merger,
consolidation, transfer of assets, reorganization, conversion or what the
Compensation Committee deems in its sole discretion to be similar
circumstances). No fractional shares shall be issued or delivered.

     This Option shall terminate and is not exercisable after the expiration of
[ten years] from the date of its grant (the "Scheduled Termination Date"),
except if terminated earlier as hereinafter provided (the "Termination Date").




<PAGE>




     In the event of a "change of control" (as hereafter defined) of the
Company, your Option may, from and after the date of the change of control, and
notwithstanding the second paragraph of this option, be exercised for up to 100%
of the total number of shares then subject to the Option minus the number of
shares previously purchased upon exercise of the Option (as adjusted for any
changes in the outstanding Common Stock by reason of a stock dividend, stock
split, combination of shares, recapitalization, merger, consolidation, transfer
of assets, reorganization, conversion or what the Compensation Committee deems
in its sole discretion to be similar circumstances).

     A "change of control" shall be deemed to have occurred upon the happening
of any of the following events:

1.   A change within a twelve-month period in a majority of the members of the
Board of Directors of the Company;

2.   A change within a twelve-month period in the holders of more than 50% of
the outstanding voting stock of the Company; or

3.   Any other event deemed to constitute a "change in control" by the
Compensation Committee.

     You may exercise your option as set forth in Section 7 of the Plan.

     If the Company's Common Stock has not been registered under Section 12 of
the Securities Exchange Act of 1934, the exercise of your Option will not be
effective unless and until you execute and deliver to the Company a Stock
Restriction Agreement, in the form on file in the office of the Secretary of the
Company.

     Your Option will, to the extent not previously exercised by you, terminate
thirty (30) days after the date on which your employment by the Company or a
parent or subsidiary corporation (an "Affiliate") of the Company is terminated,
whether such termination is voluntary or not, other than by reason of disability
as defined in Section 22(e)(3) of the Internal Revenue Code of 1986, as amended
(the "Code"), and the regulations thereunder, or death, in which case your
Option will terminate six (6) months from the date of termination of employment
due to disability or death (but in no event later than the Scheduled Termination
Date).  After the date your employment is terminated, as aforesaid, you may
exercise this Option only for the number of shares which you had a right to
purchase and did not purchase on the date your employment terminated.  If you
are employed by an Affiliate of the Company, your employment shall be deemed to
have terminated on the date your employer ceases to be an Affiliate of the
Company, unless you are on that date transferred to the Company or another
Affiliate of the 


                                          2
<PAGE>


Company.  Your employment shall not be deemed to have terminated if you are
transferred from the Company to an Affiliate, or vice versa, or from one
Affiliate to another Affiliate.

     Anything in this Option to the contrary notwithstanding, your Option will
terminate immediately if your employment is terminated for cause (as determined
by the Company in its sole and absolute discretion).  Your employment shall be
deemed to have been terminated for cause if you are terminated due to, among
other reasons, (i) your willful misconduct or gross negligence, (ii) your
material breach of any agreement with the Company or (iii) your failure to
render satisfactory services to the Company.

     If you die while employed by the Company or an Affiliate of the Company
your legatee(s), distributee(s), executor(s) or administrator(s), as the case
may be, may, at any time within six (6) months after the date of your death (but
in no event later than the Scheduled Termination Date), exercise the Option as
to any shares which you had a right to purchase and did not purchase during your
lifetime.  If your employment with the Company or an Affiliate is terminated by
reason of your becoming disabled (within the meaning of Section 22(e)(3) of the
Code and the regulations thereunder), you or your legal guardian or custodian
may at any time within six (6) months after the date of such termination (but in
no event later than the Scheduled Termination Date), exercise the Option as to
any shares which you had a right to purchase and did not purchase prior to such
termination.  Your legatee, distributee, executor, administrator, guardian or
custodian must present proof of his authority satisfactory to the Company prior
to being allowed to exercise this Option.

     This Option is not transferable otherwise than by will or the laws of
descent and distribution, and is exercisable during your lifetime only by you,
including, for this purpose, your legal guardian or custodian in the event of
disability.  Until the Option price has been paid in full pursuant to due
exercise of this Option and the purchased shares are delivered to you, you do
not have any rights as a shareholder of the Company.  The Company reserves the
right not to deliver to you the shares purchased by virtue of the exercise of
this Option during any period of time in which the Company deems, in its sole
discretion, that such delivery would violate a federal, state, local or
securities exchange rule, regulation or law.

     Notwithstanding anything to the contrary contained herein, this Option is
not exercisable until all the following events occur and during the following
periods of time:

          (a)  Until the Plan pursuant to which this Option is granted is
approved by the shareholders of the Company in the 


                                          3
<PAGE>


manner prescribed by the Code and the regulations thereunder; 

          (b)  Until this Option and the optioned shares are approved and/or
registered with such federal, state and local regulatory bodies or agencies and
securities exchanges as the Company may deem necessary or desirable; or 

          (c)  During any period of time in which the Company deems that the
exercisability of this Option, the offer to sell the shares optioned hereunder,
or the sale thereof, may violate a federal, state, local or securities exchange
rule, regulation or law, or may cause the Company to be legally obligated to
issue or sell more shares than the Company is legally entitled to issue or sell.


     The following two paragraphs shall be applicable if, on the date of
exercise of this Option, the Common Stock to be purchased pursuant to such
exercise has not been registered under the Securities Act of 1933, as amended,
and under applicable state securities laws, and shall continue to be applicable
for so long as such registration has not occurred:

          (a)  The optionee hereby agrees, warrants and represents that he will
acquire the Common Stock to be issued hereunder for his own account for
investment purposes only, and not with a view to, or in connection with, any
resale or other distribution of any of such shares, except as hereafter
permitted.  The optionee further agrees that he will not at any time make any
offer, sale, transfer, pledge or other disposition of such Common Stock to be
issued hereunder without an effective registration statement under the
Securities Act of 1933, as amended, and under any applicable state securities
laws or an opinion of counsel acceptable to the Company to the effect that the
proposed transaction will be exempt from such registration.  The optionee shall
execute such instruments, representations, acknowledgements and agreements as
the Company may, in its sole discretion, deem advisable to avoid any violation
of federal, state, local, or securities exchange rule, regulation or law.

          (b)  The certificates for Common Stock to be issued to the optionee
hereunder shall bear the following legend:

          "The shares represented by this certificate have not been registered
          under the Securities Act of 1933, as amended, or under applicable
          state securities laws.  The shares have been acquired for investment
          and may not be offered, sold, transferred, pledged or otherwise
          disposed of without an effective registration statement under the
          Securities Act of 1933, as amended, and under any applicable state
          securities laws or an opinion of counsel 


                                          4
<PAGE>


          acceptable to the Company that the proposed transaction will be exempt
          from such registration."

     The foregoing legend shall be removed upon registration of the legended
shares under the Securities Act of 1933, as amended, and under any applicable
state laws or upon receipt of any opinion of counsel acceptable to the Company
that said registration is no longer required.

     The sole purpose of the agreements, warranties, representations and legend
set forth in the two immediately preceding paragraphs is to prevent violations
of the Securities Act of 1933, as amended, and any applicable state securities
laws.

     It is the intention of the Company and you that this Option shall not be an
"Incentive Stock Option" as that term is used in Section 422 of the Code and the
regulations thereunder.

     This Option shall be subject to the terms of the Plan in effect on the date
this Option is granted, which terms are hereby incorporated herein by reference
and made a part hereof.  In the event of any conflict between the terms of this
Option and the terms of the Plan in effect on the date of this Option, the terms
of the Plan shall govern.  This Option constitutes the entire understanding
between the Company and you with respect to the subject matter hereof and no
amendment, modification or waiver of this Option, in whole or in part, shall be
binding upon the Company unless in writing and signed by an appropriate officer
of the Company.  This Option and the performances of the parties hereunder shall
be construed in accordance with and governed by the laws of the State of New
York without regard to principles of conflict of laws.

     Please sign the copy of this Option and return it to the Company, thereby
indicating your understanding of and agreement with its terms and conditions.

                         NETWORK-1 SECURITY SOLUTIONS, INC.


                         By:  _______________________________


     I hereby acknowledge receipt of a copy of the foregoing Stock Option and
the Network-1 Security Solutions, Inc. 1996 Stock Option Plan, and having read
such documents, hereby signify my understanding of and my agreement with their
terms and conditions. 


____________________________  _______________________________



                                          5
<PAGE>


(Signature)                   (Date)





















                                          6

<PAGE>
                                                                   Exhibit 10.22

                                              October 1, 1998


Corey Horowitz, President
CMH Capital Management Corp.
885 Third Avenue, Suite 2900
New York, New York 10016


Dear Corey:

     This letter agreement shall confirm that CMH Capital Management Corp.
("CMH") will provide financial advisory services to Network-1 Security
Solutions, Inc. ("Network-1"), from the date hereof through December 31, 1998,
which services shall include, but not be limited to, advice related to strategic
business relationships, structuring financings, attendance at meetings with
potential strategic partners and general advice related to Network-1 and its
products. In consideration of such services to be provided by CMH, Network-1
shall issue to CMH 10,000 shares of its common stock.

         If the foregoing correctly sets forth our agreement, please sign below
indicating your acceptance.


                                         Very truly yours,

                                         Network-1 Security Solutions, Inc.


                                         By: /s/ Avi A. Fogel
                                           ------------------------------------
                                           Avi A. Fogel, President and Chief 
                                             Executive Officer
 
Agreed and Accepted:

CMH Capital Management Corp.


By: /s/ Corey M. Horowitz
    ----------------------------------
    Corey M. Horowitz, President



<PAGE>

                                                                   Exhibit 10.23

                                    AGREEMENT


     AGREEMENT, dated as of October 20, 1998, by and among NETWORK-1 SECURITY
SOLUTIONS, INC. (the "Company"), a Delaware corporation with offices at 70
Walnut Street, Wellesley Hills, Massachusetts 02481 and the noteholders
signatory hereto (collectively, the "Noteholders").

     WHEREAS, the Underwriter, Whale Securities Co., L.P., has conditioned 
proceeding with the Company's initial public offering ("IPO") on the 
Noteholders exchanging outstanding promissory notes in the principal amount 
plus accrued interest of $2,954,888 (the "Notes") into Series C Preferred 
Stock, par value $.01 per share, of the Company (the "Preferred Stock"), upon 
the terms and subject to the conditions set forth herein;

     WHEREAS, subject to the Company's consummation of its IPO, the Noteholders
and the Company desire that the Noteholders exchange the Notes into an aggregate
of 562,836 shares of Preferred Stock on the terms and subject to the conditions
set forth herein. The Preferred Stock issuable upon exchange of the Notes is
referred to herein as the "Preferred Shares."

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereto agree as
follows:

                                   ARTICLE I.

                          Issuance of Shares for Notes

     1.1 Debt Exchange Agreement. Subject to the Company's consummation of 
the IPO, at the Closing provided for in Section 1.2 hereof, the Company will 
issue to each Noteholder and, subject to the terms and conditions of this 
Agreement, each Noteholder will exchange the Notes for the number of 
Preferred Shares set forth in Exhibit A hereto based on an exchange price of 
$5.25 per share (the "Debt Exchange"). The form of Certificate of 
Designation describing the terms of the Preferred Shares is attached as 
Exhibit B hereto.

     1.2 The Closing. The closing of the Debt Exchange (the "Closing") shall
take place at the offices of Bizar Martin & Taub, LLP, 1350 Avenue of the
Americas, New York, New York, or at such other designated place, simultaneously
with the Company's consummation of its IPO (the time and date of the Closing
being herein referred to as the "Closing Date"). On the Closing Date there will
be issued to the Noteholders the Preferred Shares against delivery and
cancellation of the original Notes. The Preferred Shares shall be held in escrow
in accordance with Section 1.3 hereof. In the event the Company does not
consummate the IPO within ninety (90) days of the date hereof, the terms and
provisions of this Agreement shall be null and void and the parties shall have
no further obligations to each other pursuant to this Agreement.

<PAGE>

     1.3 Escrow of Preferred Shares; Over-allotment Option Adjustment. The 
Preferred Shares to be issued to the Noteholders in accordance with Section 
1.1 hereof shall be held in escrow by Bizar Martin & Taub, LLP (the "Escrow 
Agent") for up to 50 days from the effective date of the IPO. In the event 
that Whale Securities Co., L.P., exercises its over-allotment option, in 
whole or in part, to purchase up to an additional 255,000 Preferred Shares of 
the Company at $6.00 per share (or an aggregate consideration of $1,530,000) 
(the "Over-allotment Option"), 50% of the net proceeds (after deduction of 
the Underwriter's commissions and the non-accountable expense allowance) 
received by the Company from the exercise of the Over-allotment Option shall 
be used to repay the Notes on a pro-rata basis and the Preferred Shares to be 
received by the Noteholders in accordance with Section 1.1 hereof shall be 
proportionately reduced.

                                   ARTICLE II.

           Representations, Warranties, and Agreements of the Company

          The Company represents and warrants to, and agrees with, the
Noteholders as follows:

     2.1 Corporate Organization and Qualification. The Company (and its wholly
owned subsidiary Network-1 Acquisition Corp.) is a corporation duly organized,
validly existing, and in good standing under the laws of its jurisdiction of
incorporation, and is qualified to transact business and is in good standing as
a foreign corporation in every jurisdiction in which its ownership, leasing,
licensing, or use of property or assets or the conduct of its business makes
such qualification necessary, except in such jurisdictions where the failure to
be so qualified or in good standing would not have a material adverse effect on
the business, results of operations, financial condition, or prospects of the
Company. Except for Network-1 Acquisition Corp., the Company has no subsidiaries
and has no investment, whether by way of ownership of stock or other securities
or by loan, advance, or otherwise, in any corporation, partnership, firm,
association, or other business entity. The Company has all required power and
authority to own its property and to carry on its business as now conducted and
proposed to be conducted.

     2.2 Validity of Transaction. The Company has all requisite power and
authority to execute, deliver, and perform this Agreement, and to issue the
Preferred Shares in exchange for the Notes. All necessary corporate proceedings
of the Company have been duly taken to authorize the execution, delivery, and
performance of this Agreement, and to authorize the issuance of the Preferred
Shares for the Notes. This Agreement, has been duly authorized, executed, and
delivered by the Company, and constitutes the legal, valid, and binding
obligation of the Company, and is enforceable as to the Company in accordance
with its respective terms, except as may be limited by applicable bankruptcy,
reorganization, insolvency, moratorium, or other similar laws or by legal or
equitable principles relating to or limiting creditors' rights generally or as
rights to indemnification may be limited by applicable securities laws. Except
as to filings which may be required under


                                        2

<PAGE>

applicable state securities regulations, no consent, authorization, approval,
order, license, certificate, or permit of or from, or declaration or filing
with, any Federal, state, local, or other governmental authority or of any court
or other tribunal is required by the Company in connection with the transactions
contemplated hereby. No consent of any party to any contract, agreement,
instrument, lease, license, arrangement, or understanding to which the Company
is a party, or by which any of its properties or assets is bound, is required
for the execution, delivery, or performance by the Company of this Agreement,
and the execution, delivery, and performance of this Agreement, will not
violate, result in a breach of, conflict with, or (with or without the giving of
notice or the passage of time or both) entitle any party to terminate or call a
default under any such contract, agreement, instrument, lease, license,
arrangement, or understanding, or violate or result in a breach of any term of
the Certificate of Incorporation or By-laws of the Company, or violate, result
in a breach of, or conflict with any law, rule, regulation, order, judgment, or
decree binding on the Company or to which any of its operations, business,
properties, or assets is subject. The Preferred Shares issuable upon exchange
of the Notes are duly authorized, will be validly issued, fully paid, and
nonassessable, will not have been issued in violation of any preemptive right of
stockholders or rights of first refusal, and the Noteholders will have good
title to the Preferred Shares, free and clear of all liens, security interests,
pledges, charges, encumbrances, stockholders agreements and voting trusts.

     2.3 Capitalization. The authorized capital stock of the Company consists of
25,000,000 shares of Common Stock and 5,000,000 shares of preferred stock, par
value $.01 per share (the "Preferred Stock"), of which 250,000 Preferred Shares
have been designated Series A Redeemable Preferred Stock, 500,000 Preferred
Shares have been designated Series B Convertible Preferred Stock and 750,000
shares will be designated Series C Convertible Preferred Stock prior to the
Closing Date, having the designations, dividend rights, voting powers,
exchange and redemption rights, rights on liquidation or dissolution, and
other preferences and relative, participating, optional, or other preferences
and relative, participating, optional, or other special rights, and the
qualifications, limitations or restrictions thereof, set forth in their
respective Certificates of Designations. On the date hereof, the Company has
2,598,464 shares of Common Stock and 500,000 shares of Series B Convertible
Preferred Stock outstanding. All issued and outstanding shares of Common Stock
and Preferred Stock have been validly issued and are fully paid and
nonassessable and have not been issued in violation of any Federal or state
securities laws. Except for the obligation of the Company to issue (a)
securities referenced in the Amendment No. 1 to the Company's Registration
Statement on form SB-2, as filed with the Securities and Exchange Commission on
September 16, 1998, relating to the initial public offering of its securities,
(b) upon the exercise of the options and warrants which are currently
outstanding to purchase 630,886 shares of Common Stock, excluding any options
issued or to be issued under the Company's Stock Option Plan), there are not, as
of the date hereof, any outstanding or authorized subscriptions, options,
warrants, calls, rights, commitments, or any other agreements obligating the
Company to issue (i) any additional shares of its capital stock or (ii) any
securities convertible into, or exercisable or exchangeable for, or evidencing
the right to subscribe for, any shares of its capital stock. Other than the
Company's Stock Option Plan, the Company has not adopted or authorized any plan
for the benefit of its officers, employees, or directors which require or permit
the issuance, sale, purchase,

                                        3

<PAGE>

or grant of any shares of the Company's capital stock, any securities
convertible into, or exercisable or exchangeable for, or evidencing the right to
subscribe for any shares of the Company's capital stock, or any phantom shares
or any stock appreciation rights.

                                  ARTICLE III.

         Representations, Warranties, and Agreements of the Noteholders

     Each of the Noteholders, severally and not jointly, represents and warrants
to, and agrees with, the Company as follows:

     3.1 Organization. Such Noteholder (if not an individual) is duly organized
under the laws of the state of its jurisdiction of organization and has full
power and authority to enter into this Agreement and to consummate the
transactions set forth herein. All necessary proceedings have been duly taken to
authorize the execution, delivery, and performance of this Agreement by such
Noteholder (if not an individual).

     3.2 Accredited Investor; Access to Information. Each Noteholder and, to the
knowledge of such Noteholder, each limited partner or shareholder of such
Noteholder in the case of a Noteholder which is a limited partnership or
corporation, and each partner of such Noteholder in the case of a Noteholder
which is a general partnership, is an "accredited investor," as that term is
defined in Rule 501 of Regulation D promulgated under the Securities Act. Each
Noteholder, the general partners, limited partners and shareholders of such
Noteholder, as the case may be, has had substantial experience in private
securities transactions like this one, is capable of evaluating the merits and
risks of an investment in the Company, and has had a full opportunity to discuss
the business, management, and financial affairs of the Company with the
Company's management. Each Noteholder has received all requested documents from
the Company and has had a full opportunity to ask questions of, and receive
answers from, the officers of the Company.

     3.3 Investment Intent. Each Noteholder is acquiring the Preferred Shares
for its, his or her own account for investment and not with a view to, or for
sale in connection with, any public distribution thereof in violation of the
Securities Act. Such Securityholder understands that Preferred Shares have not
been registered for sale under the Securities Act or qualified under applicable
state securities laws and that the Preferred Shares are being offered and sold
to such Noteholder pursuant to one or more exemptions. Such Noteholder
understands that it, he or she must bear the economic risk of the investment in
the Company for an indefinite period of time, as the Preferred Shares cannot be
sold unless subsequently registered under the Securities Act and qualified under
state securities laws, unless an exemption from such registration and
qualification is available. Such Noteholder acknowledges that no public market
for the securities of the Company presently exists and none may develop in the
future.

     3.4 Transfer of Securities. Such Noteholder will not sell or otherwise
dispose of the Preferred Shares unless (a) a registration statement with respect
thereto has become effective under


                                        4

<PAGE>


the Securities Act and such Preferred Shares have been qualified under
applicable state securities laws or (b) there is presented to the Company notice
of the proposed transfer and, if it so requests, a legal opinion reasonably
satisfactory to the Company that such registration and qualification is not
required; provided, however, that no such registration or qualification or
opinion of counsel shall be necessary for a transfer by such Noteholder (i) to
any entity controlled by, or under common control with, such Noteholder (ii) to
a partner or officer of such Noteholder, (iii) to a partner or officer of the
general partner of such Noteholder, or (iv) to the spouse, lineal descendants,
estate, or a trust for the benefit of any of the foregoing, provided the
transferee agrees in writing to be subject to the terms hereof to the same
extent as if he were such Noteholder. Such Noteholder consents that any transfer
agent of the Company may be instructed not to transfer any Preferred Shares
unless it receives satisfactory evidence of compliance with the foregoing
provisions, and that there may be endorsed upon any certificate representing
such shares (and any certificates issued in substitution therefor) the following
legend calling attention to the foregoing restrictions on transferability of
such shares, stating in substance:


                  "THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE
                  BEEN ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN
                  REGISTERED UNDER THE SECURITIES ACT OF 1933 OR
                  QUALIFIED UNDER ANY STATE SECURITIES LAW."

The Company shall, upon the request of any holder of a stock certificate bearing
the foregoing legend and the surrender of such certificate, issue a new stock
certificate without such legend if (A) the stock evidenced by such certificate
has been effectively registered under the Securities Act and qualified under any
applicable state securities law and sold by the holder thereof in accordance
with such registration and qualification, or (B) such holder shall have
delivered to the Company a legal opinion reasonably satisfactory to the Company
to the effect that the restrictions set forth herein are no longer required or
necessary under the Securities Act or any applicable state law.

     3.5 Authorization. All actions on the part of such Noteholder necessary for
the authorization, execution, delivery, and performance by such Noteholder of
this Agreement have been taken. This Agreement has been duly authorized,
executed, and delivered by such Noteholder, is the legal, valid, and binding
obligation of such Noteholder, and are enforceable as to such Noteholder in
accordance with their respective terms, except as may be limited by applicable
bankruptcy, reorganization, insolvency, moratorium, or other similar laws or by
legal or equitable principles relating to or limiting creditors' rights
generally or as rights to indemnification may be limited by applicable
securities laws.

         3.6 Finder or Broker. Neither such Noteholder nor any person acting on
behalf of such Noteholder has negotiated with any finder, broker, intermediary,
or similar person in connection with the transactions contemplated herein.


                                        5

<PAGE>

                                   ARTICLE IV.

                             Additional Provisions.

     4.1 Indemnification. From and after the Closing, the Company, on the one
hand, and the Noteholders (severally and not jointly), on the other hand, shall
indemnify and save harmless the other (including officer, directors, employees,
agents and representatives) against any loss, claim, liability, expense
(including reasonable attorney's fees) or other damage caused by or arising out
of (i) the breach of any representation or warranty made by any such party or
(ii) the failure by the party against whom indemnification is sought to perform
any of its covenants or agreements in this Agreement.

     4.2 Escrow Agent - Indemnification. The parties acknowledge that: (i) the
Escrow Agent is acting solely as a stakeholder at their request and for their
convenience and without compensation; (ii) the Escrow Agent shall not be deemed
to be the agent of any of the parties; and (iii) the Escrow Agent shall not be
liable to any party herein in connection with its role as Escrow Agent, or the
performance of its duties as Escrow Agent hereunder, or any act or omission in
connection therewith, except for acts of gross negligence or willful misconduct.
The parties hereby jointly and severally indemnify and agree to defend and hold
the Escrow Agent harmless from and against all costs, claims and expenses,
including, but not limited to, reasonable attorneys' fees suffered or incurred
by the Escrow Agent and arising out of or related to its role as escrow agent or
the performance of its duties hereunder, including the costs and expenses of
defending itself (whether by retained attorneys or by itself) against any claim
or liability arising out of or related to such role or such performance, except
to the extent the same were suffered or incurred as a result of the Escrow
Agent's gross negligence or willful misconduct.

     4.3 Communications. All notices or other communications hereunder shall be
in writing and shall be given by registered or certified mail (postage prepaid
and return receipt requested), by an overnight courier service which obtains a
receipt to evidence delivery, or by telex or facsimile transmission (provided
that written confirmation of receipt is provided), addressed as set forth below:

         If to the Company:

               Network-1 Security Solutions, Inc.
               70 Walnut Street
               Wellesley, MA 02481
               Attention: Avi A. Fogel, President and Chief Executive Officer

         With a copy to:

               Bizar Martin & Taub, LLP
               1350 Avenue of the Americas
               29th Floor
               New York, New York 10019
               Attention:  Sam Schwartz, Esq.


                                        6

<PAGE>

     If to the Noteholders, at their respective addresses as set forth on
Exhibit A hereto, or such other address as any party may designate to the other
in accordance with the aforesaid procedure. All notices and other communications
sent by overnight courier service shall be deemed to have been given as of the
next business day after delivery thereof to such courier service, those given by
telex or facsimile transmission shall be deemed given when sent, and all notices
and other communications sent by mail shall be deemed given as of the third
business day after the date of deposit in the United States mail.

     4.4 Successors and Assigns. The Company may not sell, assign, transfer, or
otherwise convey any of its rights or delegate any of its duties under this
Agreement, except to a corporation which has succeeded to substantially all of
the business and assets of the Company and has assumed in writing its
obligations under this Agreement, and this Agreement shall be binding on the
Company and such successor. This Agreement shall be binding upon, inure to the
benefit of, and be enforceable by, the Noteholders and their successors and
assigns.

     4.5 Amendments and Waivers. Neither this Agreement nor any term hereof may
be changed or waived (either generally or in a particular instance and either
retroactively or prospectively) absent the written consent each party hereto.

     4.6 Survival of Representations. The representations, warranties,
covenants, and agreements made herein or in any certificate or document executed
in connection herewith shall survive the execution and delivery of this
Agreement and the issuance and delivery of the Preferred Shares to the
Noteholders.

     4.7 Delays or Omissions; Waiver. No delay or omission to exercise any
right, power, or remedy accruing to either the Company or the Noteholders upon
any breach or default by the other under this Agreement shall impair any such
right, power, or remedy no shall it be construed to be a waiver of any such
breach or default, or any acquiescence therein or in any similar breach or
default thereafter occurring; nor shall any waiver of any single breach or
default be deemed a waiver of any other breach or default theretofore or
thereafter occurring.

     4.8 Entire Agreement; Binding Effect. This Agreement (together with the
exhibit attached hereto) contains the entire understanding of the parties with
respect to their respective subject matter and all prior negotiations,
discussions, commitments, and understandings heretofore had between them with
respect thereto are merged herein and therein. This Agreement and the Debt
Exchange shall be binding on each Noteholder who executes this Agreement. The
failure of any Noteholder named in Exhibit A to execute this Agreement shall not
effect the Closing of the Debt Exchange with respect to those Noteholders who
have executed this Agreement.

     4.9 Headings. All article and section headings herein are inserted for
convenience only and shall not modify or affect the construction or
interpretation of any provision of this Agreement.

     4.10 Counterparts; Governing Law. This Agreement may be executed in any
number of counterparts, each of which shall be deemed an original but all of
which together shall constitute one and the same instrument. This Agreement
shall be governed by, and construed in accordance with, the laws of the State of
Massachusetts, without giving effect to conflict of laws.


                                        7

<PAGE>


     4.11 Further Actions. At any time and from time to time, each party agrees,
without further consideration, to take such actions and to execute and deliver
such documents as may be reasonably necessary to effectuate the purposes of this
Agreement.


     IN WITNESS WHEREOF, this Agreement has been duly executed on the date
hereinabove set forth.


                       NETWORK-1 SECURITY SOLUTIONS, INC.


                       By: /s/ Avi A. Fogel
                           ---------------------------------------
                           Name:      Avi A. Fogel
                           Title:     President and Chief Executive Officer

                       Noteholders:

                       APPLEWOOD ASSOCIATES, L.P.


                       By: /s/ Barry Rubenstein
                           ---------------------------------------
                           Name:      Barry Rubenstein
                           Title:     General Partner


                       CMH CAPITAL MANAGEMENT CORP.


                       By: /s/ Corey M. Horowitz
                           ---------------------------------------
                           Name:      Corey M. Horowitz
                           Title:     President

                       /s/ Corey M. Horowitz
                       ---------------------------------------
                            COREY M. HOROWITZ


                       RAPTUR MANAGEMENT CO.


                       By: /s/ Steve Ackerman
                           ---------------------------------------
                       Name:      
                       Title:     

                       /s/ Douglas Lipton
                       ---------------------------------------
                            DOUGLAS LIPTON


                                        8

<PAGE>


                      /s/ Lawrence A. Wein
                      ---------------------------------------
                           LAWRENCE WEIN


                      /s/ Steven Heineman
                      ---------------------------------------
                           STEVEN HEINEMAN


                      /s/ Herb Karlitz
                      ---------------------------------------
                           HERB KARLITZ

                      /s/ Charles Stevenson
                      ---------------------------------------
                           CHARLES P. STEVENSON, JR.


                      /s/ Albert Kalimian
                      ---------------------------------------
                           ALBERT KALIMIAN


                      NAVIGATOR FUND, L.P


                      By: /s/ Corey Horowitz
                          ---------------------------------------
                          Name:      Corey M. Horowitz
                          Title:     Authorized Signatory


                      NAVIGATOR GLOBAL FUND


                      By: /s/ Corey Horowitz
                          ---------------------------------------
                          Name:      Corey M. Horowitz
                          Title:     Authorized Signatory


                      /s/ Robert Graifman
                      ---------------------------------------
                           ROBERT GRAIFMAN


                      MBF CAPITAL CORP.


                      By: /s/ Mark Fisher
                          ---------------------------------------
                          Name:      
                          Title:     

                                        9

<PAGE>

                                    EXHIBIT A

<TABLE>
<CAPTION>

                                                             PRINCIPAL AMOUNT OF
                                                            PROMISSORY NOTES AND
                                                           ACCRUED INTEREST (AS OF                     NUMBER OF SHARES
                                                           OCTOBER 30, 1998) TO BE                        OF SERIES C
              NAME AND ADDRESS                             CONVERTED INTO SERIES C                      PREFERRED STOCK
              OF SECURITYHOLDER                                PREFERRED STOCK                          TO BE RECEIVED
- ---------------------------------------------  ----------------------------------------------- ---------------------------------

<S>                                                              <C>                                        <C>    
Applewood Associates, L.P.                                       $2,009,156                                 382,696
68 Wheatley Road
Brookville, New York 11545

CMH Capital Management Corp.                                      $171,541                                  32,675
875 Third Avenue, Suite 2900
New York, New York 10022

Corey M. Horowitz                                                  $41,193                                   7,846
220 East 63rd Street, PH-D
New York, New York 10021

Raptur Management Co.                                              $87,075                                  16,586
c/o Corey Horowitz
CMH Capital Management Corp.
875 Third Avenue, Suite 2900
New York, New York 10022

Douglas Lipton                                                     $43,538                                   8,293
1235 Park Avenue, Apt 2B
New York, New York 10128

Lawrence Wein                                                      $21,769                                   4,146
247 West 12th Street
New York, New York 10014

Steven Heineman                                                    $21,769                                   4,146
69 LaRue Drive
Huntington, New York 11743

Herb Karlitz                                                       $64,364                                  12,260
55 Old Quarry Road
Englewood Drive, NJ 07631

Charles P. Stevenson, Jr.                                          $87,075                                  16,586
45 Rockefeller Plaza
Suite 1776
New York, New York 10022
</TABLE>



                                                             10

<PAGE>

<TABLE>
<CAPTION>

                                                             PRINCIPAL AMOUNT OF
                                                            PROMISSORY NOTES AND
                                                           ACCRUED INTEREST (AS OF                     NUMBER OF SHARES
                                                           OCTOBER 30, 1998) TO BE                        OF SERIES C
              NAME AND ADDRESS                             CONVERTED INTO SERIES C                      PREFERRED STOCK
              OF SECURITYHOLDER                                PREFERRED STOCK                          TO BE RECEIVED
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>                                       <C>  
Albert Kalimian                                                    $43,538                                   8,293
P.O. Box 645
Locust Valley, NY 11560

Navigator Fund, L.P.                                              $264,766                                  50,432
45 Rockefeller Plaza
Suite 1776
New York, New York 10022

Navigator Global Fund                                              $37,085                                   7,064
45 Rockefeller Plaza
Suite 1776
New York, New York 10022

Robert Graifman                                                    $20,826                                   3,967
100 Tennyson
Short Hills, NJ

MBF Capital Corp.                                                  $41,193                                   7,846
12 East 49th Street
New York, New York 10017

- -----------------------------------------------------------------------------------------------------------------------------
                           TOTAL:                                $2,954,888                                 562,836
</TABLE>


                                       11


<PAGE>
                           CERTIFICATE OF DESIGNATION
                           OF SERIES C PREFERRED STOCK

                       NETWORK-1 SECURITY SOLUTIONS, INC.

                 -----------------------------------------------

                     Pursuant to Section 242 of the General
                    Corporation Law of the State of Delaware

                 -----------------------------------------------

     We, the undersigned, Avi A. Fogel, being the President and Chief Executive
Officer of Network-1 Security Solutions, Inc. ("Corporation") and Robert Russo,
Secretary of the Corporation, hereby certify pursuant to Section 151(g) of the
General Corporation Law of the State of Delaware that:

     1. The name of the Corporation is Network-1 Security Solutions, Inc.

     2. The Certificate of Incorporation of the Corporation was filed with the
Department of State on July 13, 1990, an Amended and Restated Certificate of
Incorporation was filed with the Department of State on February 28, 1994, and
Certificates of Amendment to the Certificate of Incorporation were filed with
the Department of State on March 16, 1994, May 18, 1998, and July 20, 1998,
respectively.

     3. Pursuant to authority thereby vested in the Board of Directors by
Article IV of the Corporation's Amended and Restated Certificate of
Incorporation, the Board of Directors adopted the following resolutions on
October ___, 1998 establishing a series of 750,000 shares of Preferred Stock of
the Corporation:

     RESOLVED, that pursuant to Section 151(g) of the General Corporation Law of
the State of Delaware and Article IV of the Corporation's Amended and Restated
Certificate of Incorporation, there is hereby established a series of the
Corporation's Preferred Stock having the following terms and designations:

     Section 1. Designation and Amount. The shares of such series having a par
value of $0.01 per share shall be designated as "Series C Convertible Preferred
Stock" (the "Series C Preferred Stock") and the number of shares constituting
such series shall be 750,000. The relative rights, preferences and limitations
of the Series C Preferred Stock shall be in all respects identical, share for
share, to the Common Stock of the Corporation, except as otherwise provided
herein.

     Section 2. Dividends. The holders of Series C Preferred Stock shall be
entitled to receive dividends and other distributions when, as and if declared
by the Board of Directors out 

<PAGE>

of funds legally available for such purposes. If at any time the Corporation
declares any dividend or other distribution on its Common Stock and there are
shares of its Series C Preferred Stock issued and outstanding, then a dividend
or other distribution shall also be declared on the Series C Preferred Stock
payable at the same time and on the same terms and conditions, entitling each
holder of Series C Preferred Stock to receive the dividend or distribution such
holder would have received had such holder converted the Series C Preferred
Stock as of the record date for determining stockholders entitled to receive
such dividend or distribution.

     Section 3. Voting Rights. Except as otherwise provided by the General
Corporation Law of the State of Delaware, the Series C Preferred Stock and the
Common Stock of the Corporation shall vote as one class, with the holder of each
share of Series C Preferred Stock entitled to the number of votes equal to the
number of shares of Common Stock into which such share of Series C Preferred
Stock could have been converted as of the record date for determining the
stockholders having notice of and to vote at such meeting.

     Section 4. Reacquired Shares. Any shares of the Series C Preferred Stock
redeemed or purchased or otherwise acquired by the Corporation in any manner
whatsoever shall be retired and cancelled promptly after the acquisition
thereof. All such shares shall upon their cancellation become authorized but
unissued shares of Preferred Stock, unless otherwise provided for in the
Certificate of Incorporation of the Corporation, and may be reissued as part of
a new series of Preferred Stock to be created by resolution or resolutions of
the Board of Directors, subject to the conditions or restrictions on issuance
set forth herein.

     Section 5. Liquidation, Dissolution or Winding Up.

     (A) Upon the liquidation, dissolution or winding up of the Corporation, no
distribution shall be made (i) to the holders of stock ranking junior (either as
to dividends or upon liquidation, dissolution or winding up) to the Series C
Preferred Stock unless, prior thereto, the holders of Series C Preferred Stock
shall have received a liquidation preference of $5.25 per share, plus an amount
equal to unpaid dividends thereon, if any, including accrued dividends, whether
or not declared, to the date of such payment or (ii) to the holders of stock
ranking on a parity (either as to dividends or upon liquidation, dissolution or
winding up) with the Series C Preferred Stock, except distributions made ratably
on the Series C Preferred Stock and all other such parity stock in proportion to
the total amounts to which the holders of all such shares are entitled upon such
liquidation, dissolution or winding up. For purposes of this Certificate, (1)
the sale, conveyance, exchange or transfer of all or substantially all of the
property and assets of the Corporation, or (2) the consolidation or merger of 
the Corporation with or into any other corporation (in which the Corporation
is not the surviving entity) shall be deemed to be a liquidation, dissolution 
or winding up of the Corporation within the meaning of this Section 5(A) if so 
elected by a majority of the outstanding shares of Series C Preferred Stock, 
in their sole discretion.

                                       2
<PAGE>

     For purposes of this Certificate the term "junior stock" shall mean the
Common Stock and any other class or series of shares of the Corporation
hereafter authorized over which Series C Preferred Stock has preference or
priority in the payment of dividends or in the distribution of assets on any
liquidation, dissolution or winding up of the Corporation.

     (B) Upon liquidation, dissolution or winding up of the Corporation, and
after full payment as provided in Section 5(A) above, the holders of Series C
Preferred Stock shall not be entitled to any further participation in any
distribution of assets by the Corporation.

     Section 6. Conversion.

     (A) Subject to the provisions for adjustments hereinafter set forth, each
share of the Series C Preferred Stock shall be convertible, at any time
hereafter, at the option of the holder thereof, in the manner hereinafter set
forth, into one fully paid and non-assessable share of Common Stock of the
Corporation.

     (B) The number of shares of Common Stock into which each share of Series C
Preferred Stock is convertible shall be adjusted from time to time as follows:

          (i)  In case the Company shall (a) subdivide the outstanding shares of
               its Common Stock into a larger number of shares, (b) combine the
               outstanding shares of its Common Stock into a smaller number of
               shares or (c) issue by reclassification of its Common Stock any
               shares of the Company, each holder of Series C Preferred Stock
               shall thereafter be entitled upon conversion to receive for each
               share of Series C Preferred Stock held by him the number of
               shares of the Company which he would have owned or have been
               entitled to receive after the happening of one of the events
               described above in this clause (i) had such share of Series C
               Preferred Stock been converted immediately prior to the happening
               of such event. Such adjustment shall become effective on the day
               next following the day upon which such subdivision, combination
               or reclassi-fication shall become effective.

          (ii) In case the Company shall consolidate or merge into or with
               another corporation, or in case the Company shall sell or convey
               to any other person or persons all or substantially all the
               property of the Company, or in case the Company shall effect a
               capital reorganization or reclassification of its Common Stock,
               each holder of Series C Preferred Stock then outstanding shall
               have the right thereafter to convert each share of Series C
               Preferred Stock held by him into the kind and amount of shares 

                                       3
<PAGE>

               of stock, other securities, cash, and property receivable upon
               such consolidation, merger, sale, conveyance, reorganization or
               reclassification by a holder of the number of shares of Common
               Stock into which such share might have been converted immediately
               prior to such consolidation, merger, sale, conveyance,
               reorganization or reclassification and shall no other conversion
               rights. In any such event, effective provision shall be made, in
               the certificate or articles or incorporation of the resulting or
               surviving corporation or otherwise or in any contracts of sale
               and conveyance so that, so far as appropriate and as nearly as
               reasonably may be, the provisions set forth herein for the
               protection of the conversion rights of the shares of Series C
               Preferred Stock shall thereafter be made applicable.

               Such adjustments shall be made successively whenever any event
               listed above shall occur.

     (C) In the event that at any time, as a result of an adjustment made
pursuant to this Section 6, the holder of any share of Series C Preferred Stock
thereafter converted shall become entitled to receive any shares of capital
stock or other securities of the Company other than shares of its Common Stock,
thereafter the number of such other shares of capital stock or other securities
so receivable upon conversion of Series C Preferred Stock shall be subject to
adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions with respect to shares of the Company's Common
Stock contained in this Section 6, and the provisions of this certificate with
respect to shares of the Company's Common Stock shall apply, to the extent
applicable, on like terms to any such other shares of capital stock or warrants
or other securities.

     (D) If any adjustment in the number of shares of Common Stock into which
each share of the Series C Preferred Stock may be converted as required pursuant
to this Section 6 would result in an increase or decrease of less than 1% in the
number of shares of Common Stock into which each share of the Series C Preferred
Stock is then convertible, the amount of any such adjustment shall be carried
forward, and adjustment with respect thereto shall be made at the time of and
together with any subsequent adjustment which, together with such amount and any
other amount or amounts so carried forward, shall aggregate at least 1% of the
number of shares of Common Stock into which each share of the Series C Preferred
Stock is then convertible. All calculations under this Section 6(D) shall be
made to the nearest one-hundredth of a share.

     (E) The Board of Directors may, but shall not be required to, increase the
number of shares of Common Stock into which each share of the Series C Preferred
Stock may be converted, in addition to the adjustment required by this Section
6, as shall be determined by it (as evidenced by a resolution of the Board of
Directors) to be advisable in order to avoid or diminish any income deemed to be
received by any holder of the Common Stock or Series C Preferred Stock


                                        4

<PAGE>

resulting from any dividend or distribution of stock or issuance of rights or
warrants to purchase or subscribe for stock or from any event treated as such
for federal income tax purposes.

     (F) The holder of any shares of the Series C Preferred Stock may exercise
his or its option to convert such shares into shares of Common Stock by
surrendering for such purpose to the Corporation, at its principal office or at
such other office or agency maintained by the Corporation for that purpose, a
certificate or certificates representing the shares of Series C Preferred Stock
to be converted accompanied by a written notice stating that such holder elects
to convert all or a specified whole number of such shares in accordance with the
provisions of this Section 6 and specifying the name or names in which such
holder wishes the certificate or certificates for shares of Common Stock to be
issued. In case such notice shall specify a name or names other than that of
such holder, such notice shall be accompanied by payment of all transfer taxes
payable upon the issuance of shares of Common Stock in such name or names. As
promptly as practicable, and in any event within five business days after the
surrender of such certificates and the receipt of such notice relating thereto
and, if applicable, payment of all transfer taxes, the Corporation shall deliver
or cause to be delivered (a) certificates representing the number of validly
issued, fully paid and non-assessable shares of Common Stock of the Corporation
to which the holder of the Series C Preferred Stock so converted shall be
entitled and (b) if less than the full number of shares of the Series C
Preferred Stock evidenced by the surrendered certificate or certificates, of
like tenor, for the number of shares evidenced by such surrendered certificate
or certificates less the number of shares converted. Such conversions shall be
deemed to have been made at the close of business on the date of giving of such
notice and of such surrender of the certificate or certificates representing the
shares of the Series C Preferred Stock to be converted so that the rights of the
holder thereof shall cease except for the right to receive Common Stock of the
Corporation in accordance herewith, and the converting holder shall be treated
for all purposes as having become the record holder of such Common Stock of the
Corporation at such time.

     (G) Upon conversion of any shares of the Series C Preferred Stock, the
holder thereof shall not be entitled to receive any accumulated, accrued or
unpaid dividends in respect of the shares so converted, provided that such
holder shall be entitled to receive any dividends on such shares of the Series C
Convertible Preferred Stock declared prior to such conversion if such holder
held such shares on the record date fixed for the determination of holders of
the Series C Preferred Stock entitled to receive payment of such dividend.

     (H) The transfer of shares of Series C Preferred Stock by any holder shall
constitute an automatic conversion of such shares into Common Stock in
accordance with 6(A) hereof; provided, that, the holder of Series C Preferred
Stock may transfer such shares without triggering such automatic conversion if a
transfer is made to (i) the holder's spouse, children or issue, trustee of
trusts or custodians for his benefit or for the benefit of his spouse, children
or issue, or (ii) any entity controlled by or under common control with such
holder or his spouse, children or issue or (iii) by operation of law pursuant to
rights of testacy and intestacy.

                                        5

<PAGE>

     (I) The Corporation shall at all times reserve and keep available out of
its authorized Common Stock the full number of shares of Common Stock of the
Corporation or other securities issuable upon the conversion of all outstanding
shares of the Series C Preferred Stock.

     Section 7. Adjustments for Consolidation, Merger, etc. Prior to the
consummation of a consolidation or merger or a sale of substantially all of the
property of the Company as described in Section 6 (B)(ii) hereof, each
corporation, including this Corporation, which may be required to deliver any
stock, securities cash or other property to the holders of shares of the Series
C Preferred Stock shall assume, by written instrument delivered to each transfer
agent of the Series C Preferred Stock, the obligation to deliver to such holder
such shares of stock, securities, cash or other property to which, in accordance
with the provisions of Section 6, such holder may be entitled and each such
corporation shall have furnished to each such transfer agent or person acting in
a similar capacity, including the Corporation, an opinion of counsel for such
corporation, stating that such assumption agreement is legal, valid and binding
upon such corporation.

     Section 8. Reports as to Adjustments. Whenever the number of shares of
Common stock into which the shares of the Series C Preferred Stock are
convertible is adjusted as provided in Section 6, the Corporation shall (A)
promptly compute such adjustment and furnish to each transfer agent or person
acting in a similar capacity, including the Corporation, for the Series C
Preferred Stock, a certificate, signed by a principal financial officer of the
Corporation, setting forth the number of shares of Common Stock into which each
share of Series C Preferred Stock is convertible as a result of such adjustment
and the computation thereof and when such adjustment will become effective and
(B) promptly mail to the holders of record of the outstanding shares of the
Series C Preferred Stock a notice stating that the number of shares into which
the shares of Series C Preferred Stock are convertible has been adjusted and
setting forth the new number of shares into which each share of the Series C
Preferred Stock is convertible as a result of such adjustment and when such
adjustment will become effective.

     Section 9. Notices of Corporate Action. In the event of:

     (A) any taking by the Corporation of a record of the holders of its Common
Stock for the purpose of determining the holders thereof who are entitled to
receive any dividend (other than a dividend payable solely in cash or shares of
common stock) or other distribution, or any right or warrant to subscribe for,
purchase or otherwise acquire any shares of stock of any class or any other
securities or property, or to receive any other right;

     (B) any capital reorganization, reclassification or recapitalization of the
Corporation (other than a subdivision or combination of the outstanding shares
of its common stock), any consolidation or merger involving the Corporation and
any other person (other than a consolidation or merger with a wholly-owned
subsidiary of the Corporation, provided that the Corporation is the surviving or
the continuing corporation and no change occurs in the common

                                        6

<PAGE>

stock), or any transfer of all or substantially all the assets of the
Corporation to any other person; or 


     (C) any voluntary or involuntary dissolution, liquidation or winding up of
the Corporation;

     then, and in each such case, the Corporation shall cause to be mailed to
each transfer agent for the shares of the Series C Preferred stock and to the
holders of record of the outstanding shares of the Series C Preferred Stock, at
least 20 days (or 10 days in case of any event specified in clause (A) above)
prior to the applicable record or effective date thereinafter specified, a
notice stating (i) the date or expected date on which any such record is to be
taken for the purpose of such dividend, distribution or right or (ii) the date
or expected date to which any such reorganization, reclassification,
recapitalization, consolidation, merger, transfer, dissolution, liquidation or
winding up is to take place and the time, if any such time is to be fixed, as of
which the holders of record of Common Stock shall be entitled to exchange their
shares of Common Stock for the securities or other property deliverable upon
such reorganization, reclassification, recapitalization, consolidation, merger,
transfer, dissolution, liquidation or winding up. Such notice shall also state
whether such transaction will result in any adjustment in the number of shares
of Common Stock into which each share of the Series C Preferred Stock shall be
convertible upon such adjustment and when such adjustment will become effective.
The failure to give any notice required by this Section 9, or any defect
therein, shall not affect the legality or validity of any such action requiring
such notice.

     IN WITNESS WHEREOF, the undersigned, being the President and Secretary of
the Corporation, do hereby execute this Certificate of Designation, here
declaring that this is their free act and deed and that the facts stated herein
are true and accordingly have hereunto set their hands as of this ____ day of
October, 1998.

                                        NETWORK-1 SECURITY SOLUTIONS, INC.


                                        By:
                                           ------------------------------------
                                               Avi A. Fogel, President
                                               and Chief Executive Officer
ATTEST:

- ---------------------------------
Robert Russo, Secretary


                                        7




<PAGE>
   
                                                                    EXHIBIT 23.1
    
 
   
CONSENT OF INDEPENDENT AUDITORS
    
 
   
    We consent to the inclusion of our report dated June 17, 1998 (July 8, 1998
with respect to Note F [3], July 17, 1998, with respect to the third paragraph
of Note A and October 20, 1998 with respect to Note J), which contains an
explanatory paragraph with respect to the Company's ability to continue as a
going concern, on the financial statements of Network-1 Security Solutions, Inc.
as of December 31, 1997 and 1996 and for each of the years then ended, in
Amendment No. 2 to its Registration Statement on Form SB-2 and to the reference
to our firm under the caption "Experts" in the Prospectus.
    
 
   
Richard A. Eisner & Company, LLP
    
 
   
New York, New York
October 22, 1998
    


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