SOFTWARE DEVELOPERS CO INC/DE/
8-K, 1995-11-30
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                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                       Securities and Exchange Act of 1934

       Date of Report (Date of earliest event reported): November 16, 1995

                     The Software Developer's Company, Inc.
             (Exact name of Registrant as specified in its charter)

                                    Delaware
                 (State or other jurisdiction of incorporation)


                1-10139                               04-2911320
       (Commission File Number)             (IRS Employer Identification No.)


              90 Industrial Park Road, Hingham, Massachusetts 02043
                (Address of principal execute offices) (Zip Code)

               Registrant's telephone number, including area code:
                                 (617) 740-0101


          (Former name or former address, if changed since last report)

                                 Page 1 of



<PAGE>

SECURITIES AND EXCHANGE COMMISSION 
FORM 8-K 
DATE OF REPORT NOVEMBER 16, 1995

                                                                          PAGE 2

ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS.

         The  Software  Developer's  Company,  Inc.  ("SDC") has entered into an
Agreement  and Plan of Merger  ("Merger  Agreement"),  dated  October 17,  1995,
amended as of November  16, 1995,  with and among ISC  Acquisition  Corp.  ("ISC
Acquisition"),  Internet  Security  Corporation  ("ISC") and Richard Kosinski to
acquire all of the capital stock of ISC. Under the terms of the Merger Agreement
which  closed on November  16, 1995,  Richard  Kosinski  will receive SDC Common
Stock, $.01 par value, valued at Seven Hundred Fifty Thousand dollars ($750,000)
at a price per share equal to $1.61 for a total of 465,838  shares of SDC Common
Stock.  The parties intend that the transaction  qualifies as a tax free reverse
triangular merger of ISC Acquisition, a wholly-owned subsidiary of SDC, with and
into ISC. The parties also intend that the transaction qualifies as a pooling of
interests  with respect to the  accounting  treatment of the merger.  The Merger
Agreement  contains an escrow  provision  which states that ten percent (10%) of
the shares of SDC Common Stock to be distributed  upon the  effectiveness of the
merger   shall  be  held  in  reserve  by  SDC.   In  the  event  that  SDC  has
indemnification   claims  against  Richard   Kosinski  for   undisclosed   known
liabilities of ISC incurred  prior to the closing,  SDC shall first recover such
claims from the SDC Common  Stock held in escrow and second  from the  remaining
SDC Common Stock received in the merger or the proceeds thereof.

         SDC,  ISC and Richard  Kosinski,  the current  President  of ISC,  have
entered into an Employment and Noncompetition  Agreement  ("Agreement") with the
following  terms  and  conditions.  During  the term of the  Agreement,  Richard
Kosinski  agrees to serve as  Vice-President  of SDC and as President of ISC. In
consideration  of  the  services  to be  rendered  by  Richard  Kosinski  to the
companies,  Richard  Kosinski will be paid an annual salary of $120,000 per year
during the term of the  Agreement.  Richard  Kosinski  was granted  seventy-five
thousand  (75,000)  incentive  stock  options to purchase  SDC Common Stock at a
price of $1.625 per share,  which  shall vest over a five-year  period.  Richard
Kosinski  shall  also be  eligible  to  participate  in the ISC bonus plan which
allows him to choose  from one of two  options for  receiving  the  remuneration
under this bonus plan.


<PAGE>

SECURITIES AND EXCHANGE COMMISSION 
FORM 8-K 
DATE OF REPORT NOVEMBER 16, 1995

                                                                          PAGE 3


ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS

         (a)      Financial statements of business acquired.

                  Audited   financial   statements   of  ISC  are  currently  in
preparation.  Since it is  impracticable  for the Registrant to provide complete
financial   statements  of  ISC's  business  together  with  this  filing,  such
statements  will be  provided  as  soon as they  have  been  made  available  to
Registrant.  In no event will the Registrant provide ISC's financial  statements
later than 60 days after the date of this filing,  even if it becomes  necessary
to file unaudited statements.

         (b)      Pro forma financial information.

                  Pro forma  financial  information of the  Registrant  combined
with  ISC are  currently  in  preparation.  Since  it is  impracticable  for the
Registrant to provide  complete pro forma financial  information of the combined
business together with this filing, such information will be provided as soon as
they are made available to the Registrant.  In no event will Registrant  provide
pro  forma  financial  information  later  than 60 days  after  the date of this
filing.

         (c)      Exhibits.

                  7.01  -  Agreement  and  Plan  of  Merger  among The  Software
                           Developer's  Company,  Inc., ISC  Acquisition  Corp.,
                           Internet  Security  Corporation and Richard  Kosinski
                           dated as of October 17, 1995.

                  7.02  -  Amendment  No. 1  to the Agreement and Plan of Merger
                           among The Software  Developer's  Company,  Inc.,  ISC
                           Acquisition Corp.,  Internet Security Corporation and
                           Richard Kosinski dated as of November 16, 1995.

                  7.03  -  Employment  and   Noncompetition   Agreement  by  and
                           among Richard  Kosinski and The Software  Developer's
                           Company, Inc. and Internet Security Corporation.

                  7.04  -  Holdback   Agreement  by   and   among  The  Software
                           Developer's Company,  Inc. and Richard Kosinski dated
                           November 16, 1995.




<PAGE>

SECURITIES AND EXCHANGE COMMISSION 
FORM 8-K 
DATE OF REPORT NOVEMBER 16, 1995

                                                                          PAGE 4


                                   SIGNATURES

Pursuant to the  requirements  of the Securities Act of 1934, the Registrant has
duly  caused this  current  report on Form 8-K to be signed on its behalf by the
undersigned hereunto duly authorized.

                                           THE SOFTWARE DEVELOPER'S
                                           COMPANY, INC.

                                           By:  /s/ Barry N. Bycoff
                                              Barry N. Bycoff
                                              President, Chief Executive Officer
                                              and Director

<PAGE>

SECURITIES AND EXCHANGE COMMISSION 
FORM 8-K 
DATE OF REPORT NOVEMBER 16, 1995

                                                                          PAGE 5


                                INDEX TO EXHIBITS
<TABLE>
<CAPTION>
                                                                                               Sequential            
     Exhibit Number                                 Description                                Page Number
<S>                        <C>                                                                 <C>   
         7.01              Agreement  and  Plan of  Merger  among  The  Software
                           Developer's  Company,  Inc., ISC  Acquisition  Corp.,
                           Internet  Security  Corporation and Richard  Kosinski
                           dated as of October 17, 1995.

          7.02             Amendment No. 1 to the Agreement and Plan of Merger among The
                           Software Developer's Company, Inc., ISC Acquisition Corp.,
                           Internet Security Corporation and Richard Kosinski dated as
                           of November 16, 1995.

          7.03             Employment and Noncompetition Agreement by and among Richard
                           Kosinski and The Software Developer's Company, Inc. and
                           Internet Security Corporation.

          7.04             Holdback Agreement by and among The Software Developer's
                           Company, Inc. and Richard Kosinski dated November 16, 1995.

</TABLE>


                                                                    Exhibit 7.01




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

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




                          AGREEMENT AND PLAN OF MERGER


                                      AMONG


                     THE SOFTWARE DEVELOPER'S COMPANY, INC.,

                             ISC ACQUISITION CORP.,

                         INTERNET SECURITY CORPORATION,

                                       AND

                                RICHARD KOSINSKI


                          DATED AS OF OCTOBER 17, 1995




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

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




<PAGE>

<TABLE>
<CAPTION>
                                TABLE OF CONTENTS
                                                                                                                     Page
<S>                                                                                                                  <C>

ARTICLE 1..........................................................................................................   2
         1.1. Definitions..........................................................................................   2

ARTICLE 2..........................................................................................................   3
         2.1 The Merger............................................................................................   3
         2.2 Effective Time........................................................................................   4
         2.3 SDC Common Stock......................................................................................   4
         2.4 Conversion and Exchange of Shares.....................................................................   4
         2.5 Fractional Shares.....................................................................................   5
         2.6 Articles of Incorporation.............................................................................   5
         2.7 Bylaws................................................................................................   5
         2.8 Directors and Officers................................................................................   5
         2.9 Subsequent Actions....................................................................................   5

ARTICLE 3..........................................................................................................   5
         3.1 Closing...............................................................................................   5
         3.2 Transactions on the Closing Date......................................................................   5
         3.3 Termination...........................................................................................   6
   
ARTICLE 4..........................................................................................................   6
         4.1 Organization of ISC; Power and Authority..............................................................   7
         4.2 Ability to Carry Out the Agreement....................................................................   7
         4.3 Capitalization of ISC; Ownership; Investment..........................................................   7
         4.4 Financial Statements; Liabilities.....................................................................   7
         4.5 Conduct of Business and Absence of Material Adverse Changes...........................................   8
         4.6 Title to Tangible Personal Properties; Absence of Liens...............................................   8
         4.7 Litigation............................................................................................   8
         4.8 Compliance with Law...................................................................................   9
         4.9 Contracts.............................................................................................   9
         4.10 Brokers and Intermediaries...........................................................................   9
         4.11 Tax Matters..........................................................................................   9
         4.12 Employee Benefits....................................................................................  10
         4.13 Insurance............................................................................................  10
         4.14 Intellectual Property................................................................................  10
         4.15 Bank Accounts........................................................................................  11
         4.16 Consultants and Employees............................................................................  11
         4.17 Labor Relations; Employees...........................................................................  12
         4.18 Transactions with Related Parties....................................................................  12
         4.19 Real Property........................................................................................  12
         4.20 Consents.............................................................................................  12
         4.21 Disclosure...........................................................................................  12

ARTICLE 5..........................................................................................................  13

<PAGE>

         5.1 Organization and Authority of the Acquirors...........................................................  13
         5.2 Ability to Carry Out the Agreement....................................................................  13
         5.3 Capitalization........................................................................................  13
         5.4 Brokers and Intermediaries............................................................................  13
         5.5 Securities Law Filings................................................................................  13
         5.6 Conduct of Business and Absence of Material Adverse Changes...........................................  14
         5.7 Title to Tangible Personal Properties; Absence of Liens...............................................  14
         5.8 Litigation............................................................................................  14
         5.9 Compliance with Law...................................................................................  14
         5.10 Tax Matters..........................................................................................  14
         5.11 Intellectual Property................................................................................  15
         5.12 Disclosure...........................................................................................  15
         5.13 Liabilities of ISC Acquisition.......................................................................  15
  
ARTICLE 6..........................................................................................................  15
         6.1 Full Access...........................................................................................  15
         6.2 Regulatory Filings; Consents..........................................................................  15
         6.3 Conduct of Business...................................................................................  16
         6.4 Confidentiality.......................................................................................  16
         6.5 Announcement..........................................................................................  17
         6.6 Efforts...............................................................................................  17
         6.7 Discussion With Others................................................................................  17
         6.8 Tax Covenant..........................................................................................  17
         6.9 Cooperation in Litigation.............................................................................  17
         6.10 Stock Transfer Restrictions..........................................................................  17
         6.11 Pooling Treatment Covenant...........................................................................  18

ARTICLE 7..........................................................................................................  18
         7.1 Representations and Warranties........................................................................  18
         7.2 Agreements............................................................................................  18
         7.3 Performance Certificates..............................................................................  18
         7.4 No Injunction.........................................................................................  18
         7.5 No Violation..........................................................................................  18
         7.6 Consents..............................................................................................  19
         7.7 Opinions of Counsel...................................................................................  19
         7.8 Tax-Free Reorganization...............................................................................  19
         7.9 Due Diligence.........................................................................................  19
         7.10 Stockholder Approval.................................................................................  19
         7.11 Employment Agreement.................................................................................  19
         7.12 No Adverse Change....................................................................................  19
         7.13 Confidentiality and Non-Disclosure Agreements........................................................  19
         7.14 Resignations.........................................................................................  20
         7.15 No Proceedings.......................................................................................  20
         7.16 Opinion of Coopers & Lybrand.........................................................................  20
         7.17 ISC Common Stock.....................................................................................  20

<PAGE>

         7.18 Securities Filings...................................................................................  20
         7.19 Distribution.........................................................................................  20
         7.20 Miscellaneous Closing Deliveries.....................................................................  20

ARTICLE 8..........................................................................................................  21
         8.1 Survival of Representations and Warranties............................................................  21
         8.2 Survival of Covenants and Agreements..................................................................  21

ARTICLE 9..........................................................................................................  21
         9.1 Indemnification of SDC................................................................................  21
         9.2 Indemnification of Exchanging Stockholder.............................................................  23
         9.3 Remedies..............................................................................................  24
         9.4 Survival..............................................................................................  24
         9.5 Holdback..............................................................................................  24
         9.6 Holdback Termination..................................................................................  24
         9.7 Assertion of Claims Against Holdback..................................................................  25
         9.8 Resolution of Conflicts; Arbitration..................................................................  25
         9.9 Beneficial Interest...................................................................................  26
         9.10 Limitation on Liability..............................................................................  26
  
ARTICLE 10.........................................................................................................  27
         10.1 Further Assurances...................................................................................  27
         10.2 Expenses.............................................................................................  27
         10.3 Applicable Law.......................................................................................  27
         10.4 Notices..............................................................................................  27
         10.5 Entire Agreement.....................................................................................  27
         10.6 Amendments...........................................................................................  28
         10.7 Counterparts.........................................................................................  28
         10.8 Parties in Interest; Assignment......................................................................  28
         10.9 Severability; Enforcement............................................................................  28
         10.10 Waiver..............................................................................................  28
         10.11 Incorporation of Exhibits and Schedules.............................................................  28
         10.12 Construction........................................................................................  28

EXHIBITS AND SCHEDULES

Exhibit A                  ISC Shares
Exhibit B                  Form of Articles of Merger (MA)
Exhibit C                  ISC Financial Statements
Exhibit D                  Form of Legal Opinion of Testa, Hurwitz & Thibeault (Intentionally Omitted)
Exhibit E                  Form of Kosinski Employment Agreement
Exhibit F                  Form of Legal Opinion of Goulston & Storrs (Intentionally Omitted)
Exhibit G                  Form of Non-Disclosure Agreement
Exhibit H                  Registration Rights for the Merger Shares

Disclosure Schedules.
</TABLE>

<PAGE>

                          AGREEMENT AND PLAN OF MERGER


         THIS AGREEMENT AND PLAN OF MERGER (the "AGREEMENT") is made and entered
into as of October 17,  1995,  by and among THE  SOFTWARE  DEVELOPER'S  COMPANY,
INC., a Delaware corporation ("SDC" or the "COMPANY");  ISC ACQUISITION CORP., a
Massachusetts   corporation   and  a   wholly-owned   subsidiary  of  SDC  ("ISC
ACQUISITION");   INTERNET  SECURITY  CORPORATION,  a  Massachusetts  corporation
("ISC");  and RICHARD  KOSINSKI,  the founder and sole  stockholder  of ISC (the
"EXCHANGING STOCKHOLDER"). (SDC and ISC Acquisition shall sometimes collectively
be referred to as the "ACQUIRORS" and individually as an "ACQUIROR"; ISC and the
Exchanging  Stockholder  shall  sometimes  collectively  be  referred  to as the
"TRANSFERORS"  and  individually as a "TRANSFEROR";  and ISC Acquisition and ISC
shall sometimes  collectively be referred to as the  "CONSTITUENT  CORPORATIONS"
and individually as a "CONSTITUENT CORPORATION".)

                              W I T N E S S E T H:

         WHEREAS,  ISC is a Massachusetts  corporation  with authorized  capital
stock of 200,000  shares of Common  Stock (as  defined  below),  of which  2,500
shares  are issued  and  outstanding  to the  Exchanging  Stockholder  (the "ISC
SHARES"); and

         WHEREAS,  the  Exchanging  Stockholder  currently  owns all  shares  of
capital stock of ISC (collectively the "SHARES"); and

         WHEREAS, ISC Acquisition is a Massachusetts corporation with authorized
capital  stock of 1,000 shares of common  stock,  $.01 par value,  500 shares of
which  immediately prior to the Effective Time (as defined below) will be issued
and outstanding and held by SDC; and

         WHEREAS,  the parties intend that the transactions  contemplated hereby
will qualify as a tax-free reverse triangular merger of ISC Acquisition with and
into ISC in a  reorganization  pursuant to Code Sections 368(a) will qualify for
pooling of interests  accounting  treatment  pursuant to  Accounting  Principles
Board Opinion No. 16, "Accounting for Business Combinations"; and

         WHEREAS,  pursuant to the Merger (as  defined  below),  the  Exchanging
Stockholder shall receive SDC Common Stock (as defined below); and

         WHEREAS,  the parties  expect that the Merger shall further  certain of
their business objectives,  including,  without limitation, the expansion of the
combined  companies'  businesses  and  the  utilization  of  the  marketing  and
distribution rights of ISC.

         NOW,  THEREFORE,  in  reliance  upon  the  premises,   representations,
warranties  and  covenants  made  herein  and in  consideration  of  the  mutual
agreements herein contained, the parties hereto hereby agree as follows:



<PAGE>
                                       2

                             ARTICLE 1 - DEFINITIONS

         1.1. DEFINITIONS.  For purposes of this Agreement,  the following terms
shall have the meanings set forth below,  unless otherwise  defined elsewhere in
this Agreement:

         "AFFILIATE"  means,  with  respect  to any  Person,  any  other  Person
directly or indirectly Controlling,  Controlled by, or under common Control with
such other Person.

         "CODE"  means the Internal Revenue Code of 1986, as amended.

         "CONTROL" (including,  with correlative meanings, the terms "controlled
by", "controlling" and "under common control with"), as used with respect to any
Person, means the possession,  directly or indirectly, of the power to direct or
cause the  direction  of the  management,  strategy and policies of such Person,
whether through ownership of voting securities, by contract or otherwise.

         "CONVERSION  NUMBER"  means the quotient of (i) the Merger Share Number
divided by (ii) the total number of the ISC Shares outstanding immediately prior
to the Effective Time.

         "ENCUMBRANCES"  means  any and all  restrictions  on  transfer,  liens,
encumbrances,  charges,  pledges,  security interests,  taxes, claims,  options,
warrants, purchase rights, contracts, commitments, equities, claims and demands.

         "ERISA" means the Employee  Retirement  Income Security Act of 1974, as
amended.

         "INTELLECTUAL  PROPERTY" means: (i) all inventions  (whether patentable
or  unpatentable  and  whether or not  reduced to  practice),  all  improvements
thereto, and all patents, patent applications, and patent disclosures,  together
with all reissuances, divisions, continuations, renewals, continuations-in-part,
revisions,  extensions, and reexaminations thereof; (ii) all trademarks, service
marks,  certification marks, collective marks, trade dress, trade styles, logos,
trade names, company names, and corporate names, together with all translations,
adaptations,  derivations,  and combinations  thereof and including all goodwill
associated  therewith,  and  all  applications,  registrations,  recordings  and
renewals in connection therewith; (iii) all copyrightable works, all copyrights,
rights  and  interests  in  copyrights  and  all  applications,   registrations,
recordings  and renewals in  connection  therewith;  (iv) all trade  secrets and
confidential  business information  (including ideas,  research and development,
know-how,  formulas,  compositions,  manufacturing and production  processes and
techniques,  technical data,  designs,  drawings,  specifications,  customer and
supplier lists,  pricing and cost information,  and business and marketing plans
and  proposals);   (v)  all  computer  software   (including  data  and  related
documentation);  (vi) all copies and tangible  embodiments  thereof (in whatever
form or medium);  (vii) all licenses with respect to any of the  foregoing;  and
(viii) all license,  marketing and distribution rights to software and hardware,
and related Intellectual Property, of any third party.

         "KNOWLEDGE"  means  actual  knowledge  of  the  Exchanging  Stockholder
without any requirement to conduct any formal investigation. In the event of any
alleged breach of any  representation  and warranty  contained herein based upon
knowledge,  the party  alleging  such breach must prove that the other party had
actual knowledge of such breach.

         "LIABILITY"  means any  liability  (whether  known or unknown,  whether
asserted or  unasserted,  whether  absolute or  contingent,  whether  accrued or
unaccrued,  whether  liquidated  or  unliquidated,  and whether due or to become
due), including liability for Taxes.

<PAGE>
                                       3

         "SDC COMMON STOCK" means the Common Stock, $.01 par value per share, of
SDC.

         "MERGER  SHARES"  means  collectively  the shares of SDC  Common  Stock
issued or issuable to ISC stockholders in connection with the Merger in exchange
for the ISC Shares.

         "MERGER  SHARE  NUMBER"  means the quotient of (i) Seven  Hundred Fifty
Thousand  (750,000) divided by (ii) the lower of (a) $1.61 or (b) the average of
the per share  closing  trade  price of SDC Common  Stock on the  NASDAQ  Market
System on the 10 business days immediately prior to the Closing.

         "1933 ACT" means the Securities Act of 1933, as amended,  and all rules
and regulations promulgated thereunder.

         "1934 ACT" means the Securities  Exchange Act of 1934, as amended,  and
all rules and regulations promulgated thereunder.

         "ISC COMMON STOCK" means the Common Stock, $.01 par value per share, of
ISC.

         "PERSON"  means  any  individual,  corporation,   partnership,  limited
partnership, trust, entity or unincorporated organization or a government or any
agency or political subdivision thereof.

         "SCHEDULE"  means any of the  disclosure  schedules to this  Agreement,
each of which is incorporated by reference into this Agreement.

         "SEC" means the United States Securities and Exchange Commission.

         "SUBSIDIARY"  means any  corporation  with respect to which a specified
Person (or  Subsidiary  thereof)  owns a majority of the common stock or has the
power to vote or direct the voting of sufficient  securities to elect a majority
of the directors.

         "TAX" or "TAXES"  means any  federal,  state,  local,  foreign or other
income,  gross receipts,  profits,  franchise,  license,  transfer,  sales, use,
payroll,  withholding,  occupation,  property  (real or  personal),  excise  and
similar taxes, fees, duties,  assessments,  withholdings or governmental charges
of any nature (including interest, penalties or additions to such taxes).

         "TAX  RETURNS"  means  all  returns,  reports,  estimates,  information
returns and statements of any nature with respect to Taxes.

                          ARTICLE 2 - BASIC TRANSACTION

         2.1 THE  MERGER.  On and  subject to the terms and  conditions  of this
Agreement,  at the Effective Time, as defined below,  ISC  Acquisition  shall be
merged with and into ISC (the "MERGER"), the separate corporate existence of ISC
Acquisition shall thereupon cease, and ISC shall be the surviving corporation in
the Merger (the "SURVIVING CORPORATION").  The Surviving Corporation shall, from
and after the Effective Time,  possess all the rights,  privileges,  powers, and
franchises of whatsoever nature and description,  as well as a public or private
nature, and be subject to all the restrictions,  disabilities and duties of each
of the Constituent Corporations.  All rights, privileges, powers, and franchises
of  each  of the  Constituent  Corporations,  and  all  property,  tangible  and
intangible, real, personal, and mixed, and 

<PAGE>
                                       4

debts or obligations due to either of the  Constituent  Corporations on whatever
account belonging to each of the Constituent Corporations shall be vested in the
Surviving Corporation. All property, rights, privileges, powers, and franchises,
and all and every other interest shall be thereafter as effectually the property
of the  Surviving  Corporation  as  they  were  of the  several  and  respective
Constituent  Corporations.  All  rights  of  creditors  and all  liens  upon the
property of the Constituent Corporations shall be preserved unimpaired,  and all
debts, liabilities, and duties of the Constituent Corporations shall thenceforth
attach to the Surviving Corporation,  and may be enforced against it to the same
extent as if said debts, liabilities, and duties had been incurred or contracted
by it.

         2.2 EFFECTIVE TIME. At the time of the Closing, each of the Constituent
Corporations shall cause Articles of Merger substantially in the form of Exhibit
B attached  hereto (the "Articles of Merger (MA)") to be duly executed and filed
with the Secretary of State of the  Commonwealth  of  Massachusetts  as provided
under the  Massachusetts  Business  Corporation  Act.  The Merger  shall  become
effective  on the  time and date  specified  in the  Articles  of  Merger,  (the
"EFFECTIVE TIME").

         2.3 SDC COMMON  STOCK.  SDC shall make  available to ISC  Acquisition a
sufficient number of shares of SDC Common Stock to effect the Merger.

         2.4  CONVERSION  AND EXCHANGE OF SHARES.  The manner of converting  and
exchanging  shares of the  corporations  participating in the Merger shall be as
follows:

                  (A) STOCK OF ISC  ACQUISITION.  Each share of capital stock of
ISC Acquisition  issued and outstanding  immediately prior to the Effective Time
shall  thereupon be  converted  into and become one (1) share of Common Stock of
the Surviving Corporation.

                  (B) STOCK OF ISC. At and as of the Effective Time each one (1)
ISC  Share  issued  and  outstanding  immediately  prior to the  Effective  Time
(excluding shares held by ISC as treasury stock, which shares shall be cancelled
and  extinguished  at the  Effective  Time)  shall by virtue of the  Merger  and
without  any  action on the part of the holder  thereof,  be  exchanged  for and
converted  into the right to receive from SDC the number of shares of SDC Common
Stock as is equal to the Conversion  Number.  ISC Shares exchanged and converted
as  provided  in this  subsection  2.4(b) are herein  sometimes  referred  to as
"Converted ISC Stock."

                  (C)  EXCHANGE  OF STOCK  CERTIFICATES.  Immediately  after the
Effective  Time,  each  holder of an  outstanding  certificate  or  certificates
theretofore  representing shares of Converted ISC Stock shall surrender the same
to the  transfer  agent  designated  by the  Surviving  Corporation,  and  shall
thereupon be entitled to receive in exchange therefor a certificate representing
the number of shares of SDC Common Stock into which the shares of Converted  ISC
Stock  represented by the certificate or certificates so surrendered  shall have
been exchanged and converted pursuant to subsection 2.4(b) above.

                  (D) NO  RIGHTS.  At the  Effective  Time,  the  holders of ISC
capital stock  immediately  prior to the Effective  Time shall cease to have any
rights as stockholders  of ISC, except such rights as may be available  pursuant
to this Agreement.

                  (E) NO FURTHER TRANSFERS.  At and after the Effective Time, no
transfer of the ISC Shares outstanding prior to the Effective Time shall be made
on the stock transfer books of the Surviving Corporation or otherwise. If, after
the Effective Time,  certificates  for ISC Shares are presented to the Surviving
Corporation,  they shall be cancelled  and  exchanged  for the Merger  Shares as
provided above.

<PAGE>
                                       5

         2.5 FRACTIONAL  SHARES.  No fractional shares of SDC Common Stock shall
be issued to the  Exchanging  Stockholder  in  connection  with the Merger.  The
Exchanging  Stockholder  who would otherwise be entitled to receive a fractional
share pursuant to the Merger shall receive cash for such  fractional  share at a
per share  rate equal to the  closing  trade  price of SDC  Common  Stock on the
NASDAQ Small-Cap System on the day immediately preceding the Closing Date.

         2.6 ARTICLES OF  INCORPORATION.  The Articles of Organization of ISC in
effect  immediately prior to the Effective Time shall be and remain the Articles
of Incorporation of the Surviving Corporation,  until duly amended in accordance
with the terms thereof and applicable state corporation law.

         2.7 BYLAWS.  The Bylaws of ISC Acquisition in effect  immediately prior
to the Effective  Time shall be the Bylaws of the Surviving  Corporation,  until
duly  amended  in  accordance  with  the  terms  thereof  and  applicable  state
corporation law.

         2.8  DIRECTORS AND OFFICERS.  The  directors of ISC  Acquisition  shall
become the  directors of the  Surviving  Corporation  at and as of the Effective
Time until  their  successors  shall have been duly  elected  or  appointed  and
qualified  in   accordance   with  the  Surviving   Corporation's   Articles  of
Organization  and Bylaws.  The  officers  of ISC  Acquisition  shall  become the
officers of the Surviving Corporation at and as of the Effective Time (retaining
their respective positions and terms of office) until their successors have been
duly  elected or  appointed  and  qualified  in  accordance  with the  Surviving
Corporation's Bylaws.

         2.9 SUBSEQUENT  ACTIONS.  If, at any time after the Effective Time, the
Surviving  Corporation  shall  consider or be advised  that any deeds,  bills of
sale,  assignments,  assurances  or any other actions or things are necessary or
desirable to vest,  perfect or confirm of record or  otherwise in the  Surviving
Corporation  its right,  title or  interest  in, to or under any of the  rights,
properties or assets of either of the Constituent Corporations acquired or to be
acquired by the Surviving Corporation as a result of, or in connection with, the
Merger or otherwise to carry out this  Agreement,  the officers and directors of
the Surviving  Corporation or SDC shall be authorized to execute and deliver, in
the name and on behalf of each of the Constituent Corporations or otherwise, all
such deeds, bills of sale, assignments and assurances and to take and do, in the
name and on behalf of each of the  Constituent  Corporations  or otherwise,  all
such other actions and things as may be necessary or desirable to vest,  perfect
or confirm any and all right,  title and  interest in, to and under such rights,
properties or assets in the Surviving Corporation or otherwise to carry out this
Agreement.

                       ARTICLE 3 - CLOSING AND TERMINATION

         3.1 CLOSING.  The closing of the transactions  provided for herein (the
"CLOSING") shall take place at 10:00 a.m. (local time) on a date to be specified
by the parties (the  "CLOSING  DATE"),  which shall be no later than October 31,
1995, at the offices of Testa, Hurwitz & Thibeault,  High Street Tower, 125 High
Street,  Boston,  Massachusetts 02110, unless another date or place is agreed to
in writing by the parties hereto.

         3.2 TRANSACTIONS ON THE CLOSING DATE. (a) At the Closing the Exchanging
Stockholder  and ISC, as the case may be,  shall  deliver to the  Acquirors  the
following:  (i) the  executed  Articles  of  Merger;  (ii)  stock  certificates,
evidencing  all of the ISC  Shares,  in each case  endorsed  in blank or with an
executed blank stock power  attached,  and with all necessary stock transfer tax
stamps attached  thereto;  

<PAGE>
                                       6

and  (iii)  each  of the  certificates,  instruments  and  other  documents  and
agreements contemplated by Article 7 hereof.

         (b) At the  Closing,  the  Acquirors  shall  deliver to the  Exchanging
Stockholder  and ISC,  as the  case  may be,  the  following:  (i) the  executed
Articles of Merger; (ii) instructions to SDC's Transfer Agent to issue the stock
certificates  evidencing the Merger Shares;  and (iii) each of the certificates,
instruments and other documents and agreements contemplated by Article 7 hereof.

         3.3  TERMINATION.  Notwithstanding  any other provision to the contrary
herein, this Agreement may be terminated at any time:

         (a)  without  liability  on  the  part  of  any  party  hereto  (unless
occasioned  by reason of failure  of one of the  parties  hereto to perform  its
obligations hereunder), by mutual consent of all parties to this Agreement;

         (b)  without  liability  on  the  part  of  any  party  hereto  (unless
occasioned  by reason of failure  of one of the  parties  hereto to perform  its
obligations hereunder),  by either SDC or ISC, if the transactions  contemplated
hereby are not consummated on or before October  31,1995,  or such later date as
may be agreed upon in writing by the parties hereto (the "TERMINATION DATE");

         (c) by SDC, if: (i) ISC or the Exchanging  Stockholder  shall breach in
any material  respect any of their  respective  representations,  warranties  or
obligations  hereunder;  (ii) SDC shall  have  notified  ISC and the  Exchanging
Stockholder  in writing of such  breach;  (iii) such breach  shall not have been
cured in all material  respects or waived by SDC; and (iv) ISC or the Exchanging
Stockholder,  as the case may be, shall not have provided  reasonable  assurance
that such  breach  shall be cured in all  material  respects  on or  before  the
Closing Date; or

         (d) by ISC or the Exchanging  Stockholder,  if: (i) the Acquirors shall
breach  in  any  material  respect  any  of  their  respective  representations,
warranties or obligations hereunder;  (ii) ISC shall have notified the Acquirors
in writing of such  breach;  (iii) such breach  shall not have been cured in all
material  respects or waived;  and (iv) the  Acquirors  shall not have  provided
reasonable assurance that such breach shall be cured in all material respects on
or before the Closing Date.

         Notwithstanding  anything  herein to the  contrary,  if this  Agreement
shall  be  terminated  prior to the  Closing,  no party  hereto  shall  have any
liability  to any other party  unless such  termination  results from a material
breach of the covenants in Article 6. In the event any party fails to consummate
the  transactions  contemplated  hereby  in  accordance  with the  terms of this
Agreement,  the  damaged  party  shall  have the right to pursue  all  available
remedies  at  law or in  equity,  including  specific  performance.  Each  party
acknowledges that, in light of the unique benefit to it of its rights under this
Agreement,  such  remedies  shall be  available in respect of any such breach or
violation by it in any  proceeding  properly  instituted in a court of competent
jurisdiction.

      ARTICLE 4 - REPRESENTATIONS AND WARRANTIES OF EXCHANGING STOCKHOLDER

         Except as otherwise set forth in the  referenced  Disclosure  Schedules
attached  hereto,  the  Exchanging  Stockholder  represents  and warrants to the
Acquirors that the  representations  and warranties  contained in this Article 4
are true,  correct,  and complete as of the date of this  Agreement and shall be
true, correct, and complete as of the Closing Date:

<PAGE>
                                       7

         4.1 ORGANIZATION OF ISC; POWER AND AUTHORITY. ISC is a corporation duly
organized,  validly existing and in good standing (both corporate and tax) under
the  laws  of the  Commonwealth  of  Massachusetts,  with  the  full  power  and
authority,  corporate and  otherwise,  to enter into this Agreement and to carry
out and perform its obligations  under the terms of this Agreement.  ISC has the
full and  unrestricted  power and authority,  corporate and  otherwise,  to own,
operate  and lease its assets and  properties  and to carry on its  business  as
currently  conducted.  This  Agreement  has been  duly  executed  by ISC and the
Exchanging  Stockholder  and  constitutes  the valid,  binding  and  enforceable
obligation of ISC and the Exchanging Stockholder.

         4.2 ABILITY TO CARRY OUT THE AGREEMENT.  Neither ISC nor the Exchanging
Stockholder  is subject to or bound by any provision  of: (i) any law,  statute,
rule,  regulation,  ordinance or judicial or administrative  decision;  (ii) any
articles  of  incorporation  or bylaws;  (iii) any  agreement,  license or other
restriction of any kind or character  whatsoever;  or (iv) any judgment,  order,
writ, injunction or decree of any authority that would prevent or be violated in
any material respect by, or would result in any penalty, default,  forfeiture or
contract  termination as a result of, nor is the consent of any Person under any
agreement  which  has  not  been  obtained   required  for,  the  execution  and
performance  by ISC and the  Exchanging  Stockholder  of this  Agreement and the
transactions  contemplated hereby,  except where such violation or default would
not have a material  adverse  effect on the  business,  financial  condition  or
prospects  of ISC,  taken as a whole,  and  except  as  otherwise  set  forth on
Schedule 4.2.

         4.3 CAPITALIZATION OF ISC;  OWNERSHIP;  INVESTMENT.  (a) The authorized
capital stock of ISC consists solely of 200,000 shares of Common Stock, 2,500 of
which are issued and outstanding.  The Common Stock is the only capital stock or
other  securities  of ISC which are  issued and  outstanding.  All shares of ISC
Common Stock have been duly authorized,  validly issued,  and are fully paid and
nonassessable.  Except as  disclosed  on  Schedule  4.3,  there are no  options,
warrants,  purchase  rights or  options,  subscription,  conversion  or exchange
rights,  rights of first refusal,  preemptive rights or other rights of any kind
to acquire any capital stock or securities  convertible into or exchangeable for
any such  securities,  nor is ISC  committed to issue any such option,  warrant,
right or security.  There are no outstanding or authorized  stock  appreciation,
phantom stock, profit participation or other similar rights with respect to ISC.
There  are  no  voting  trusts,  proxies,  or  other  agreements,   commitments,
obligations,  or other  understandings with respect to the voting of the capital
stock of ISC.

         (b) The Exchanging Stockholder has good, valid, and marketable title to
his  shares,  free and clear of any and all  Encumbrances,  with full  right and
lawful  authority to transfer and deliver his shares pursuant to this Agreement.
Except as set forth on Schedule 4.3, the  Exchanging  Stockholder is not a party
to any  contract or  commitment  that could  require him to sell,  transfer,  or
otherwise  dispose of any  capital  stock of ISC (other  than  pursuant  to this
Agreement).

         (c)  ISC  has  no  Subsidiaries  and  does  not  control,  directly  or
indirectly,  or have any direct or indirect equity participation or any interest
in any corporation, partnership, or trust or any joint venture or other business
association of a material nature.

         4.4 FINANCIAL STATEMENTS; LIABILITIES. (a) Attached hereto as Exhibit C
are the following  financial  statements  of ISC  (collectively  the  "FINANCIAL
STATEMENTS"):  (i) the unaudited  balance  sheets and  statements of operations,
retained  earnings,  and cash flows as at and for the fiscal year ended December
31, 1994 as compiled by Peck & Associates  (the "MOST RECENT  FISCAL YEAR END");
and (ii) the  unaudited  balance  sheet and  statement of income  ("MOST  RECENT
FINANCIAL  STATEMENTS") as at and for the period ended September 30, 1995 ("MOST
RECENT FISCAL MONTH END").  ISC has also given SDC access to and permitted it to
conduct a detailed  review of ISC's books and records (the "BOOKS AND 

<PAGE>
                                       8

RECORDS"). The revenues, expenses and assets reflected in such Books and Records
are a true, complete and correct record of the revenues,  expenses and assets of
ISC as of the dates set forth in such Books and Records.

         (b) There are no Liabilities except for those: (i) accrued or reflected
on the face of the Most Recent Financial  Statements;  or (ii) arising after the
Most Recent  Fiscal  Month End in the  ordinary  course of business (no material
amount of which results from, arises out of, relates to, is in the nature of, or
was caused by any breach of contract, breach of warranty, tort infringement,  or
violation of law) or as  otherwise  disclosed  on Schedule  4.4.  The  Financial
Statements,  Books and Records,  and the Schedules hereto, taken as a whole (the
"FINANCIAL  INFORMATION"),  fairly present the financial  position of ISC at the
dates  thereof and for the periods  covered  thereby.  Notwithstanding  anything
herein to the contrary, the Exchanging Stockholder shall be deemed in compliance
with the representations and warranties set forth in this Section 4.4(b) as long
as and to the extent that the Financial  Information  does not overstate by more
than ten percent (10%) the aggregate assets or total revenues (with  appropriate
off-sets for overstated  Liabilities  and expenses),  or understate by more than
ten percent (10%) the aggregate  Liabilities or total expenses (with appropriate
off-sets for understated assets and revenues),  as at and for the periods ending
on the dates of the Most Recent Fiscal Year End and the Most Recent Fiscal Month
End.

         4.5 CONDUCT OF BUSINESS AND ABSENCE OF MATERIAL ADVERSE CHANGES.  Since
the Most Recent Fiscal Year End,  there has been no material  adverse  change in
the business, operations,  results of operations, assets, properties,  financial
condition or prospects of ISC. Since such date,  except as  contemplated in this
Agreement ISC has conducted its business in the manner theretofore conducted and
only in the ordinary course  consistent  with past  practices.  Since such date,
except  as  disclosed  on  Schedule  4.5,  ISC has not  incurred,  committed  or
guaranteed any indebtedness, obligation, capital expenditure or other Liability,
made any dividend or cash  distribution,  issued any  securities,  discharged or
granted any Encumbrance,  involving its assets,  written down or written off any
accounts receivable,  paid any bonus, severance or other payment to any employee
or consultant in excess of current  salary,  had any contract,  license or other
agreement  result in  default  or  termination  (or a right of a third  party to
terminate), or entered into a transaction with any officer or employee.

         4.6 TITLE TO TANGIBLE PERSONAL PROPERTIES; ABSENCE OF LIENS. (a) Except
as set forth on Schedule 4.6, ISC has good,  valid and  marketable  title to, or
valid  and  subsisting   leasehold  interests  in,  substantially  all  personal
properties and assets used in its business, located on its premises, or shown on
the balance  sheet of the Most Recent  Financial  Statements  (the "MOST  RECENT
BALANCE  SHEET") or acquired  after the date thereof,  free and clear of any and
all  Encumbrances,  except for:  (i)  Encumbrances  reflected in the Most Recent
Balance Sheet;  or (ii)  Encumbrances  disclosed in Schedule 4.6. The assets and
properties owned or leased by ISC constitute substantially all of the assets and
properties  necessary  to conduct the  business of ISC in the manner in which it
has previously been conducted.

         4.7  LITIGATION.  Except  as set  forth on  Schedule  4.7,  there is no
charge,  claim,  cause  of  action,  complaint,   action,  suit,  proceeding  or
investigation  (collectively,  "LITIGATION") pending or, to the Knowledge of the
Exchanging  Stockholder,  threatened  against  ISC,  which  could  result in any
material  adverse  change  in the  business,  financial  condition,  results  of
operations,  assets,  Liabilities, or prospects of ISC. ISC has not breached the
material terms of, and is not in any material  respect in default of, any of its
obligations with respect to any Contracts with any of its licensors,  licensees,
partners  or  joint  venturers,  distributors,  business  consultants  or  other
independent contractors.

<PAGE>
                                       9

         4.8 COMPLIANCE WITH LAW. ISC has complied in all material respects with
all applicable laws and regulations of  governmental  authorities  applicable to
its business.  All  governmental  approvals,  permits and licenses  required for
ISC's business have been obtained,  are in full force and effect,  and are being
complied with in all material respects.

         4.9 CONTRACTS.  (a) Schedule  4.9(a) sets forth a list of each material
written contract or agreement  outstanding as of the date hereof to which ISC is
a party.  All of the agreements set forth in Schedule 4.9(a)  (collectively  the
"CONTRACTS" or  individually a "CONTRACT")  are valid,  binding,  enforceable in
accordance  with their  respective  terms  against  ISC and,  to the  Exchanging
Stockholder's  Knowledge, the other parties thereto, and, except as set forth in
Schedule 4.9, will be in full force and effect  following  the  consummation  of
this  Agreement.  Except as set forth on  Schedule  4.9,  there is not under any
Contract: (i) any existing material default, breach,  termination,  or violation
by ISC  or,  to the  Exchanging  Stockholder's  Knowledge,  by any  other  party
thereto;  (ii) an event  which,  after  notice  or lapse of time or both,  would
constitute  a  material  default,  termination,  or  breach  by ISC  or,  to the
Exchanging  Stockholder's  Knowledge, by any other party, or permit termination,
modification,  or acceleration,  under the Contract; or (iii) any repudiation of
any  material  provision  of  any  Contract.   With  respect  to  each  item  of
Intellectual  Property required to be identified in Schedule 4.14: (i) except as
disclosed in the  Schedules  hereto,  the  license,  sublicense,  agreement,  or
permission shall continue to be legal, valid, binding,  enforceable, and in full
force and effect against ISC and, to the Exchanging Stockholder's Knowledge, any
other parties  thereto on identical,  modified or improved  terms  following the
Closing;   (ii)  ISC  has  received  no  notice  that  the  underlying  item  of
Intellectual Property is subject to any outstanding injunction, judgment, order,
decree, ruling, or charge; and (iii) ISC has received no notice that any action,
proceeding,  hearing,  investigation,  charge,  complaint,  claim,  or demand is
pending  or  is  threatened   which  challenges  the  legality,   validity,   or
enforceability  of the underlying item of Intellectual  Property or any Contract
related thereto.

         4.10  BROKERS  AND  INTERMEDIARIES.  Except for the  agreement  between
Wagner Resources and American Systems & Technology, Inc. (the "ISC FINDERS") and
ISC, a copy of which has been  furnished  to SDC,  none of the  Transferors  has
employed any broker,  finder,  advisor or other  intermediary in connection with
the transactions contemplated by this Agreement which would be entitled to a fee
or commission  in connection  therewith or upon the  consummation  thereof.  The
Exchanging  Stockholder  or ISC shall be solely  responsible  and liable for the
payment of such fees or commissions of all brokers or finders engaged by him and
ISC and the  amount of such fee or  commission  shall be  offset at the  Closing
against and deducted from the Merger  consideration to be paid to the Exchanging
Stockholder hereunder.  Prior to the Effective Time, ISC shall make a payment to
the ISC Finders of $22,500 from its working  capital to pay finders' fees of ISC
and the  Exchanging  Stockholder  with respect to the cash portion of the Merger
consideration.

         4.11 TAX MATTERS. (a) ISC has been an S Corporation (within the meaning
of Section 1361 (a)(1) of the Code) since its inception through the date hereof.
ISC and the Exchanging  Stockholder have filed all Tax Returns that it or he has
been required to file regarding ISC. ISC or the  Exchanging  Stockholder  has no
Liability  with respect to Taxes which  relates to the business of ISC. All such
Tax Returns were correct and complete in all material  respects.  All Taxes owed
by ISC or the  Exchanging  Stockholder,  with  respect  to the  business  of ISC
(whether or not shown on any Tax Return),  have been paid or adequately reserved
against for all Taxes. ISC and the Exchanging  Stockholder currently are not the
beneficiary  of any  extension of time within which to file any Tax Return (with
respect to the  business  of ISC).  No  material  claim has ever been made by an
authority in a jurisdiction where ISC and the Exchanging Stockholder do not file
Tax Returns that it is or may be subject to taxation by that jurisdiction. There
are no Encumbrances  on any of the assets of ISC and the Exchanging  Stockholder

<PAGE>
                                       10

(with respect to the business of ISC) that arose in connection  with any failure
(or alleged failure) to pay any Tax.

         (b) ISC and the Exchanging Stockholder (with respect to the business of
ISC) has withheld and paid or adequately  reserved against all Taxes required to
have been  withheld and paid (with respect to the business of ISC) in connection
with amounts paid or owing to any employee, consultant,  independent contractor,
creditor, stockholder of ISC, or other third Person, except where the failure to
withhold or pay Taxes does not exceed $3,000 (including penalties and interest).

         (c) The Exchanging  Stockholder does not expect any authority to assess
any additional Taxes for any period for which Tax Returns have been filed. There
is no  material  dispute or claim  concerning  any Tax  Liability  of ISC or the
Exchanging Stockholder (with respect to the business of ISC) either: (i) claimed
or raised by any authority in writing;  or (ii) as to which any of the directors
and officers (and employees  responsible  for Tax matters) of ISC has Knowledge.
The  Transferors  have delivered to SDC correct and complete  copies of all such
federal,  state and local income Tax Returns or the Exchanging Stockholder (with
respect to the business of ISC).  ISC has not waived any statute of  limitations
in respect of Taxes or has a Tax assessment or deficiency.

         (d)      There are no reserves established for any Tax Liability.

         (e)      The Exchanging Stockholder has no present plan,  intention  or
arrangement  to dispose of any of the Merger Shares in a manner that would cause
the Merger to violate the continuity of  shareholder  interest  requirement  set
forth in Treas. Reg. ss. 1.368-1.

         4.12 EMPLOYEE  BENEFITS.  Schedule 4.12 briefly  describes ISC's health
plan for shared medical coverage. ISC maintains no employee benefit plan that is
subject to ERISA and has no Liability  for any employee  benefit plan or for its
employee  health  and  disability  insurance  plan  which  could have a material
adverse effect on its assets, financial condition or operations.

         4.13  INSURANCE.   Schedule  4.13  identifies  each  insurance   policy
(including  policies  providing  property,  casualty,  liability,  and  workers'
compensation  coverage and bond and surety arrangements) to which ISC has been a
party,  a named  insured,  or otherwise the  beneficiary of coverage at any time
since its  formations.  With  respect  to each  such  insurance  policy,  to the
Exchanging  Stockholder's  Knowledge:  (i) the policy is legal, valid,  binding,
enforceable,  and in full  force  and  effect;  (ii) ISC is not nor is any other
party to the policy in breach or default  (including with respect to the payment
of premiums or the giving of  notices),  and no event has occurred  which,  with
notice or the lapse of time,  would  constitute  such a breach  or  default,  or
permit termination,  modification, or acceleration,  under the policy; and (iii)
no party to the policy has repudiated any provision thereof.

         4.14  INTELLECTUAL  PROPERTY.  (a) Except as set forth on Schedule 4.14
and subject to subsection  4.14(f) below,  ISC owns or has the continuing  valid
and legal right to use pursuant to license, sublicense, agreement, or permission
all  Intellectual  Property of ISC or any third party necessary for and material
to the  operation of the  businesses  of ISC as presently  conducted.  Except as
disclosed in Schedule 4.2 or Schedule 4.14,  each material item of  Intellectual
Property  licensed,  owned  or  used by ISC  immediately  prior  to the  Closing
hereunder shall be licensed, owned or used by ISC subsequent to the Closing, and
the  consummation  of the  transactions  contemplated  hereby  will not  cause a
breach, default or termination of any license or distribution agreement with any
third party.  Except as set forth  Schedule  4.14,  ISC has taken all reasonably
necessary action to maintain and protect each item of Intellectual Property that
it licenses, owns or uses.

<PAGE>
                                       11

         (b) To the  Knowledge  of  the  Exchanging  Stockholder,  ISC  has  not
materially interfered with, infringed upon,  misappropriated,  or otherwise come
into conflict with, any Intellectual  Property rights of third Persons, and none
of the  Transferors  has ever received any claim,  demand or notice alleging any
such interference,  infringement,  misappropriation, or violation (including any
claim  that ISC must  license or refrain  from using any  Intellectual  Property
rights of any third party). To the Knowledge of the Exchanging  Stockholder,  no
third Person has interfered with, infringed upon, misappropriated,  or otherwise
come into conflict  with any  Intellectual  Property of ISC or the  Intellectual
Property of any third party licensed and/or distributed by ISC.

         (c) To the Knowledge of the Exchanging Stockholder ISC has not utilized
any inventions of any of its employees (or people it currently  intends to hire,
if any) made prior to their employment by ISC in violation of the rights of such
employees  or any third  parties.  All persons who have worked on  copyrightable
material,  including without limitation software programs, which are used in and
are significant to the conduct of ISC business have been employees of ISC at the
time such  materials were  authored,  designed,  created or reduced to practice,
and,  except as disclosed in Schedule 4.14, all such employees have been subject
to non-disclosure and assignment of inventions  agreements.  Schedule 4.14 lists
the Intellectual  Property of ISC which is either claimed as proprietary and not
subject to a patent or copyright application,  and lists each license, agreement
or other  permission  which ISC has granted to or received from any third Person
with  respect to any of its  Intellectual  Property or license and  distribution
rights  of  Intellectual  Property  of  any  third  party.  Schedule  4.14  also
identifies each trade name or  unregistered  trademark used by ISC in connection
with its business.  With respect to each item of Intellectual  Property required
to be identified  in Schedule  4.14:  (i) ISC is not subject to any  outstanding
injunction, judgment, order, decree, ruling, or charge with respect to the item;
and(ii) no action, suit, proceeding, hearing, investigation,  charge, complaint,
claim,  or demand is pending or is, to the Exchanging  Stockholder's  Knowledge,
threatened  which  challenges the legality,  validity,  enforceability,  use, or
ownership of the item.

         (d) Schedule 4.14 identifies  each item of  Intellectual  Property that
any  third  Person  owns  and that ISC uses  pursuant  to  license,  sublicense,
distribution agreement, or permission.

         (e) To the Knowledge of the  Exchanging  Stockholder,  ISC's  ownership
and/or right to the use of its  Intellectual  Property or those of third parties
does not interfere with, infringe upon,  misappropriate,  or otherwise come into
conflict with, any Intellectual  Property rights of third Persons as a result of
the continued  operation of its business as presently conducted and as presently
proposed to be conducted.

         (f)  Notwithstanding  anything in this Agreement to the contrary,  with
respect to Intellectual  Property  licensed from third parties no representation
or warranty is made (i) regarding such third parties'  rights to use or title in
such Intellectual  Property,  or (ii) that ISC has any rights therein other than
such valid and legal rights, if any, of such third parties as may be licensed or
otherwise  provided to ISC pursuant to contracts  between such third parties and
ISC.

         4.15 BANK  ACCOUNTS.  Schedule 4.15 sets forth a true and complete list
of all bank accounts of ISC and all authorized signatories to each such account.

         4.16  CONSULTANTS  AND EMPLOYEES.  ISC has heretofore  delivered to the
Acquirors a correct and complete Schedule 4.16 listing as of the date hereof all
of the consultants  and employees of ISC,  showing their names,  positions,  and
current wage or salary and bonuses.

<PAGE>
                                       12

         4.17  LABOR  RELATIONS;   Employees.  ISC  has  no  written  employment
agreements  with  any  of its  employees.  To the  Knowledge  of the  Exchanging
Stockholder,  no  employee  important  to the  business  of ISC has any plans to
terminate employment.  To the knowledge of the Exchanging Stockholder,  there is
no claim nor any  grounds for any claim by any Person or party  (including,  but
not  limited  to,  governmental  agencies)  against  ISC  arising out of conduct
relating to discrimination against employees or any employee practices.

         4.18 TRANSACTIONS WITH RELATED PARTIES. Except as set forth in Schedule
4.18,  none of the  Exchanging  Stockholder  or any  present or former  officer,
director or shareholder  of ISC, and no Affiliate of the Exchanging  Stockholder
or of such  officer,  director  or  shareholder:  (i) has been  involved  in any
business  (excluding  relationships  and payments arising from the employment or
retention  by ISC of any  such  persons  in the  ordinary  course  of  business)
arrangement  or  relationship  with  ISC,  including,  without  limitation,  any
agreement,  or other arrangement  providing for the employment of, furnishing of
services,  by, rental of real or personal  property from or otherwise  requiring
payment to any such  person or  Affiliate;  or (ii) owns any asset,  tangible or
intangible, which is used in or licensed to the business of ISC.

         4.19 REAL PROPERTY. ISC owns no real property.  Schedule 4.19 lists and
describes  briefly all real  property  leased or subleased to or by ISC. ISC has
delivered to SDC correct and complete copies of the leases and subleases  listed
in Schedule  4.19 (as amended to date).  With respect to each lease and sublease
listed in Schedule 4.19: (i) to the Knowledge of the Exchanging Stockholder, the
lease or sublease is legal, valid, binding,  enforceable,  and in full force and
effect;  (ii) to the  Knowledge  of the  Exchanging  Stockholder,  the  lease or
sublease shall continue to be legal, valid,  binding,  enforceable,  and in full
force  and  effect  on  identical  terms  following  the   consummation  of  the
transactions  contemplated  hereby;  (iii) to the  Knowledge  of the  Exchanging
Stockholder,  no party to the lease or sublease is in breach or default,  and no
event has  occurred  which,  with notice or lapse of time,  would  constitute  a
breach  or  default  or  permit  termination,   modification,   or  acceleration
thereunder; (iv) to the Knowledge of the Exchanging Stockholder, no party to the
lease or sublease has  repudiated  any provision  thereof;  and (v) there are no
disputes, oral agreements,  or forbearance programs in effect as to the lease or
sublease.

         4.20 CONSENTS. No consent, approval or authorization of any third party
is  required  in  connection  with the  valid  execution  and  delivery  of this
Agreement  and the  consummation  by ISC or the  Exchanging  Stockholder  of the
transactions contemplated hereby, except consents to assignments of contracts of
ISC disclosed on Schedule 4.2.

         4.21  DISCLOSURE.  No  information  contained  in this  Agreement,  any
Disclosure Schedule,  any related documents,  the Financial  Statements,  or any
written statement furnished by or on behalf of ISC or the Exchanging Stockholder
pursuant  to the  terms of this  Agreement  contains  any  untrue  statement  of
material fact or omits to state any material fact necessary in order to make the
statements and information  contained  herein or therein not misleading in light
of the circumstances under which made.

<PAGE>
                                       13

                  ARTICLE 5 - REPRESENTATIONS AND WARRANTIES OF
                                  THE ACQUIRORS

         The Acquirors  jointly and  severally  represent and warrant to ISC and
the Exchanging Stockholder that:

         5.1  ORGANIZATION   AND  AUTHORITY  OF  THE  ACQUIRORS.   SDC  and  ISC
Acquisition are  corporations  duly  incorporated,  validly existing and in good
standing under the laws of the state of their  organization,  with the corporate
power and authority to enter into this Agreement and to perform their respective
obligations  hereunder.  The  execution  and delivery of this  Agreement and the
consummation of the transactions  contemplated  hereby have been duly authorized
by all requisite  corporate  action on the part of each of the  Acquirors.  This
Agreement  has been duly  executed and  delivered by each of the  Acquirors  and
constitutes  the  valid,  binding  and  enforceable  obligation  of  each of the
Acquirors.

         5.2 ABILITY TO CARRY OUT THE  AGREEMENT.  Neither of the  Acquirors  is
subject to or bound by any provision of: (i) any law, statute, rule, regulation,
ordinance  or  judicial  or  administrative   decision;  (ii)  any  articles  or
certificate  of  incorporation  or bylaws;  (iii) any  mortgage,  deed of trust,
lease,  note,  shareholders'  agreement,  bond,  indenture,  other instrument or
agreement, license, permit, trust, custodianship, other restriction, of any kind
or character whatsoever; or (iv) any judgment, order, writ, injunction or decree
of any court,  governmental body, administrative agency or arbitrator that would
prevent or be violated by or would result in any penalty, forfeiture or contract
termination  as a result of, or under which there would be a default as a result
of, nor is the consent of any Person under any material  agreement which has not
been obtained  required for, the execution,  delivery and performance by each of
the Acquirors of this Agreement and the transactions  contemplated hereby, other
than violations,  penalties,  forfeitures,  contract  terminations,  defaults or
failure to obtain consents which,  singly or in the aggregate,  shall not have a
material adverse effect on the  enforceability  or validity of this Agreement or
the ability of the Acquirors to perform their obligations hereunder.

         5.3 CAPITALIZATION. SDC is authorized to issue: (i) Twenty Five Million
(25,000,000) shares of Common Stock, $.01 par value, of which Seven Million Four
Hundred Forty Three  Thousand Seven Hundred Forty Eight  (7,443,748)  shares are
issued and outstanding;  and (ii) Five Million  (5,000,000)  shares of Preferred
Stock,  $.01 par value per share,  of which  905,968  shares are  designated  as
Series C Preferred  Stock and 760,968 are issued and  outstanding.  SDC also has
reserved  2,707,500  shares of SDC Common  Stock for  issuance  pursuant  to its
various stock plans (the "SDC STOCK PLANS") and has granted  options to purchase
an  aggregate  of  1,397,409  shares of Common Stock under its various SDC Stock
Plans.  All of the  Merger  Shares  to be issued  in the  Merger  have been duly
authorized and, upon the  consummation  of the Merger,  shall be validly issued,
fully paid, and nonassessable.

         5.4 BROKERS AND INTERMEDIARIES.  None of the Acquirors has employed any
broker,  finder,  advisor,  or intermediary in connection with the  transactions
contemplated by this Agreement which would be entitled to a fee or commission in
connection therewith or upon the consummation thereof.

         5.5 SECURITIES LAW FILINGS. SDC has previously furnished to ISC and the
Exchanging  Stockholder  copies of:  (i) its Annual  Report on Form 10-K for the
year ended March 31, 1995, as filed with the SEC;  (ii) its Quarterly  Report on
Form 10-Q for the quarter  ended June 30, 1995, as filed with the SEC, and (iii)
its proxy statement for its 1995 Annual Meeting of  Stockholders,  as filed with
the SEC.  Such SEC Reports,  as of the date of the filing  thereof with the SEC,
complied as to form in all material respects with the provisions of the 1934 Act
and the rules and regulations promulgated thereunder.  SDC has disclosed in such
part SEC Reports all information that it would be required to

<PAGE>
                                       14

disclose  under the 1933 Act and the 1934 Act had the SDC Common Stock  acquired
by the  Exchanging  Stockholder  been offered and sold  pursuant to an effective
registration  statement  on Form S-3 filed  under the 1933 Act  (other  than the
inclusion of risk factors).

         5.6 CONDUCT OF BUSINESS AND ABSENCE OF MATERIAL ADVERSE CHANGES.  Since
the Most Recent Fiscal Year End,  there has been no material  adverse  change in
the business, operations,  results of operations, assets, properties,  financial
condition or prospects of SDC. Since such date,  except as  contemplated in this
Agreement,  SDC has conducted its business in the manner  theretofore  conducted
and only in the ordinary  course  consistent  with past  practices.  SDC has not
incurred,  committed  or  guaranteed  any  indebtedness,   obligation,   capital
expenditure or other Liability,  made any dividend or cash distribution,  issued
any securities, written down or written any accounts receivable, paid any bonus,
severance or other  payment to any employee or  consultant  in excess of current
salary,  had any  contract,  license  or other  agreement  result in  default or
termination  (or a  right  of a third  party  to  terminate),  or  entered  into
transaction  with any officer or employee  other than in the ordinary  course of
business.

         5.7 TITLE TO TANGIBLE  PERSONAL  PROPERTIES;  ABSENCE OF LIENS. (a) SDC
has good,  valid and  marketable  title  to, or valid and  subsisting  leasehold
interests in, all personal  properties and assets used in its business,  located
on its  premises,  or shown on the balance  sheet of the Most  Recent  Financial
Statements (the "MOST RECENT BALANCE SHEET") or acquired after the date thereof,
free  and  clear  of any and all  Encumbrances,  except  for:  (i)  Encumbrances
reflected in the Most Recent Balance Sheet; or (ii) Encumbrances incurred in the
ordinary  course of business.  The assets and properties  owned or leased by SDC
constitute  substantially all of the assets and properties  necessary to conduct
the business of SDC in the manner in which it has previously been conducted.

         5.8 LITIGATION.  There is no charge, claim, cause of action, complaint,
action, suit, proceeding or investigation  (collectively,  "LITIGATION") pending
or, to the  Knowledge of SDC,  threatened  against SDC (or any basis  therefor),
which could result in any material  adverse  change in the  business,  financial
condition, results of operations,  assets, Liabilities, or prospects of SDC. SDC
has not breached the  material  terms of, and is not in any material  respect in
default  of,  any of  its  obligations  with  respect  to any of its  licensors,
licensees,  partners or joint venturers,  distributors,  business consultants or
other independent contractors.

         5.9 COMPLIANCE WITH LAW. SDC has complied in all material respects with
all applicable laws and regulations of  governmental  authorities  applicable to
its business  where  noncompliance  would have a material  adverse effect on the
business,  assets,  results of  operation  or  financial  condition  of SDC. All
governmental approvals,  permits and licenses required for and material to SDC's
business  have  been  obtained,  are in full  force  and  effect,  and are being
complied with in all material respects.

         5.10 TAX  MATTERS.  (a) SDC has filed all Tax Returns  that it has been
required to file  regarding  SDC. SDC has no material  Liability with respect to
Taxes which  relates to the  business of SDC.  All such Tax Returns were correct
and  complete in all  material  respects.  All Taxes owed by SDC (whether or not
shown on any Tax Return),  have been paid or adequately reserved against for all
Taxes accrued but not yet payable.  SDC currently is not the  beneficiary of any
extension  of time within  which to file any Tax Return.  No material  claim has
ever been made by an  authority  in a  jurisdiction  where SDC does not file Tax
Returns that it is or may be subject to taxation by that jurisdiction. There are
no  Encumbrances  on any of the assets of SDC that arose in connection  with any
failure (or alleged failure) to pay any Tax.

<PAGE>
                                       15

         (b) SDC has withheld and paid or adequately  reserved against all Taxes
required to have been withheld and paid in connection with amounts paid or owing
to any employee,  consultant,  independent contractor,  creditor, stockholder of
SDC, or other third  Person,  except  where the failure to withhold or pay Taxes
does not exceed $10,000 (including penalties and interest).

         (c) SDC does not expect any  authority to assess any  additional  Taxes
for any period  for which Tax  Returns  have been  filed.  There is no  material
dispute or claim  concerning  any Tax  Liability  of SDC either:  (i) claimed or
raised by any authority in writing; or (ii) as to which any of the directors and
officers of SDC has knowledge.  SDC has not waived any statute of limitations in
respect of Taxes or has a Tax assessment or deficiency.

         5.11  INTELLECTUAL  PROPERTY.  The Company owns or has a valid right to
use the permits, licenses, trademarks, trade names, copyrights, and intellectual
property  rights  being used to conduct its  business a now  operated and as now
proposed to be operated. To the Company's knowledge, the conduct of its business
as now  operated  and as now  proposed  to be  operated  does  not and  will not
conflict with or infringe upon the intellectual  property rights of others where
the existence of any such  infringement  would have a material adverse effect on
the business, assets, operations or financial condition of the Company. No claim
is pending or, to the Knowledge of the Company,  threatened  against the Company
to the effect that any such intellectual property right owned or licensed by the
Company,  or which the  Company  otherwise  has the right to use,  is invalid or
unenforceable by the Company.

         5.12  DISCLOSURE.  No  information  contained  in this  Agreement,  any
related  documents,  any of the Reports  furnished  to  Transferors  pursuant to
Section 5.5, or any written statement furnished by or on behalf of the Acquirors
pursuant  to the  terms of this  Agreement  contains  any  untrue  statement  of
material fact or omits to state any material fact necessary in order to make the
statements and information  contained  herein or therein not misleading in light
of the circumstances under which made.

         5.13  LIABILITIES OF ISC  ACQUISITION.  As of the date hereof and as of
the Effective Time, ISC Acquisition has not incurred,  nor will it have accrued,
any material obligations other than those set forth in this Agreement.

                  ARTICLE 6 - CERTAIN COVENANTS AND AGREEMENTS
                          OF TRANSFERORS AND ACQUIRORS

         6.1 FULL ACCESS.  From the date hereof until the earlier of the Closing
or the  termination of this Agreement  pursuant to Section 3.3 above,  ISC shall
permit representatives of SDC to have full access at all reasonable times during
normal  business  hours,  and in a  manner  so as not to  interfere  the  normal
business  operations  of  ISC,  to  all  premises,   customers,  key  employees,
properties,  books,  records,  contracts,  tax  records,  and  documents  of  or
pertaining to the business of ISC. From the date hereof until the earlier of the
Closing or the termination of this Agreement  pursuant to Section 3.3 above, SDC
shall permit the Exchanging  Stockholder and  representatives of the Transferors
to have full access at all reasonable times during normal business hours, and in
a manner so as not to interfere with the normal  business  operations of SDC, to
all premises,  customers, key employees,  properties, books, records, accounting
and tax records, agreements and documents of or pertaining to SDC.

         6.2  REGULATORY  FILINGS;  CONSENTS.  From the date  hereof  until  the
earlier of the Closing or the termination of this Agreement  pursuant to Section
3.3 above, each of the parties hereto shall: (i) take any additional action that
is reasonably necessary,  proper or advisable in connection with any notices to,
filings with,  and  authorizations,  consents and approvals of third parties and
governments and 

<PAGE>
                                       16

governmental  agencies  that it is  required  to obtain  in order to effect  the
transactions  contemplated  hereunder;  and (ii)  furnish  to the other  parties
hereto, such reasonably necessary  information and reasonable assistance as such
other party or parties may  reasonably  request in connection  with its or their
preparation of necessary filings or submissions to any governmental  agency. ISC
and SDC  shall  each  give any  notices  to third  Persons,  and shall use their
respective best efforts to obtain any third Person  consents,  modifications  or
amendments of agreements, or other approvals, that SDC may request.

         6.3 CONDUCT OF BUSINESS.  From the date hereof until the earlier of the
Closing or the termination of this Agreement  pursuant to Section 3.3 above, and
except as otherwise  contemplated  by this Agreement or consented to or approved
by SDC in writing,  which consent shall not be unreasonably withheld or delayed,
ISC shall not engage in any  practice,  take an action,  embark on any course of
action,  or enter into any  transaction  outside the ordinary course of business
consistent  with  past  practices.   Without  limiting  the  generality  of  the
foregoing, ISC shall:

                  (i) not take any action,  engage in any practice or enter into
any  transaction  of the nature or sort  referred to in Section  4.5,  except as
permitted  therein;  (ii) cause the business  conducted by ISC to be operated in
all material  respects in the  ordinary  and usual  course and use  commercially
reasonable  efforts to keep and preserve its  business  and  properties  intact,
including its present operations,  physical  facilities,  working conditions and
relationships  with employees,  suppliers,  customers,  lessors and licensors of
such  business;  (iii) not effect or  authorize  any change or  amendment to the
Articles of  Organization  or By-laws of ISC except an amendment to the Articles
of Organization  eliminating  the  requirement  that ISC continue the Exchanging
Stockholder's  employment  agreement  after the Closing;  (iv) use  commercially
reasonable  efforts to maintain  in full force and effect all of ISC's  existing
insurance until the Closing Date in amounts not less than those in effect on the
date hereof;  (v) other than the Tax  Distribution,  Cash Distribution and other
distributions  provided in Section  7.19,  not  declare,  set aside,  or pay any
dividend or make any  distribution  with respect to its capital stock or redeem,
purchase,  or  otherwise  acquire any of its capital  stock,  and (vi)  promptly
notify the Acquirors in writing of any actions,  suits or proceedings instituted
or  threatened  against  ISC at law or in  equity,  before  or by any  court  or
governmental  authority;   any  changes  in  key  personnel;   and  any  adverse
development  causing  a  breach  of any of the  representations  and  warranties
contained in Article 4 above.  No disclosure by ISC pursuant to this Section 6.3
shall be deemed to amend or supplement the disclosures contained in any Schedule
or to prevent or cure any  misrepresentation,  breach of warranty,  or breach of
covenant.

         The  parties  acknowledge  that as a result of their  ongoing  business
operations it may become necessary or advisable to update the Schedules prior to
the Closing  Date.  Notwithstanding  the  foregoing,  the  Transferors  agree as
follows:  (i) as of the date of this Agreement,  none of the Transferors has any
Knowledge of any material items of Liability,  contingent or otherwise,  on his,
its or their part which are not  disclosed in the  Schedules,  and (ii) any such
material item of Liability as to which the  Transferors  have Knowledge but fail
to disclose in the  Schedules  as of the date hereof or  otherwise  prior to the
Closing,   shall  be  deemed  an  item  for   which  the   Acquirors   may  seek
indemnification  under the provisions of Article 10 hereof;  provided,  however,
that if any such  material  Liability  that is not disclosed in the schedules on
the date hereof is disclosed prior to the Closing and the Acquirors elect not to
the  consummate  the Merger prior to the Effective  Time, and the Acquirors have
actual knowledge of such undisclosed  Liability,  the Transferors  shall have no
liability  or  indemnity  obligation  to the  Acquirors  with  respect  to  such
undisclosed Liability or as a result of not disclosing such Liability.

         6.4  CONFIDENTIALITY.  Each  party to this  Agreement  agrees  that all
information  concerning  the  business  and offices of the other  parties to the
Agreement  that  is  not  generally  available  to  the  public   ("CONFIDENTIAL
INFORMATION")  and obtained  from such other party shall be deemed  confidential
and shall 

<PAGE>
                                       17

not be disclosed to any Person for any reason or purpose  whatsoever,  except in
connection  with  this  Agreement,  to the  parties  and  their  representatives
involved  in  this  transaction,  or as may by  required  by  law,  governmental
regulation or policy, or stock exchange regulation.  In the event this Agreement
is  terminated,  all such  Confidential  Information  shall,  upon  request,  be
returned  to the  appropriate  parties,  together  with any and all copies  made
thereof.

         6.5 ANNOUNCEMENT.  Promptly after the execution of this Agreement,  SDC
shall  make a public  statement  approved  by SDC and ISC with  respect  to this
Agreement and the transactions  contemplated  hereby.  Thereafter,  prior to the
Closing,  ISC shall not issue any press  release  or  otherwise  make any public
statement  with  respect to this  Agreement  and the  transactions  contemplated
hereby without the prior consent of SDC (which consent shall not be unreasonably
withheld) except as may be required by applicable law,  governmental  regulation
or policy, or stock exchange regulation.

         6.6 EFFORTS.  Without  limiting the specific  obligations  of any party
hereto under any  agreement or covenant  hereunder,  each of the parties  hereto
shall use its respective  reasonable efforts to take all action and do such acts
and things  necessary in order to consummate and make effective the transactions
contemplated by this Agreement (including  satisfaction,  but not waiver, of the
conditions to Closing set forth in Article 7 below).

         6.7 DISCUSSION  WITH OTHERS.  From the date hereof until the earlier of
October 31, 1995 or the  termination of this  Agreement  pursuant to Section 3.3
above,  none of the  Transferors  shall:  (i)  discuss,  solicit,  initiate,  or
encourage  the  submission  of any  proposal  or  offer  from any  third  Person
concerning  the  sale or  acquisition  of any  capital  stock  or  other  voting
securities,  or any  significant  assets  of,  ISC  (including  any  acquisition
structured as a merger,  consolidation,  or share  exchange);  or (ii) engage or
participate  in any  discussions  or  negotiations  regarding,  enter  into  any
agreement  with respect to, furnish any  information  with respect to, assist or
participate  in, or  facilitate in any other manner any effort or attempt by any
third Person to do or seek any of the foregoing.  ISC shall  immediately  notify
SDC if any third  Person makes any  proposal,  offer,  inquiry,  or contact with
respect to any of the foregoing.

         6.8 TAX COVENANT.  The  Exchanging  Stockholder  has no present plan or
intention  to dispose of any of the Merger  Shares  received  in the Merger in a
manner  that would  cause the Merger to violate the  continuity  of  stockholder
interest  requirement set forth in Treas.  Reg. ss. 1.368-1  pursuant to Section
368 of the Code.

         6.9 COOPERATION IN LITIGATION.  Each party hereto shall fully cooperate
with the other in the defense or  prosecution  of any  litigation  or proceeding
already instituted or which may be instituted hereafter against or by such party
relating  to or arising  out of the  conduct of the  business of ISC prior to or
after the Closing Date (other than  litigation  arising out of the  transactions
contemplated by this Agreement). The party requesting such cooperation shall pay
the out-of-pocket expenses (including legal fees and disbursements) of the party
providing such cooperation and of its officers, directors,  employees and agents
reasonably incurred in connection with providing such cooperation,  including an
appropriate per diem fee for the time of such personnel.

         6.10     STOCK TRANSFER RESTRICTIONS.

         (a)      The Exchanging Stockholder acknowledges as follows:

<PAGE>
                                       18

                  (i) A restrictive  legend  acknowledging  the  restrictions on
resale  of  the  Merger  Shares  under  the  1933  Act  will  be  placed  on the
certificates representing the Merger Shares; and

                  (ii) The resale of the Merger  Shares  shall be subject to the
restrictions on transfer set forth in Rule 144 promulgated under the 1933 Act.

         (b) SDC shall, commencing on or after February 15, 1996, use reasonable
efforts to prepare and file with the SEC a  registration  statement  on Form S-3
under the 1933 Act registering  the Merger Shares for resale to the public.  The
registration rights provided by the Company with respect to the Merger Shares to
be issued to the Exchanging Stockholder are further set forth on Exhibit H.

         6.11 POOLING TREATMENT COVENANT.  The Exchanging  Stockholder shall not
sell,  dispose of or otherwise assign or transfer the Merger Shares prior to the
publication  and release of financial  information  which  includes the combined
results of  operations  of SDC and ISC for a period of thirty  (30) days of such
combined operations. It is anticipated that publication of such combined results
of operations of SDC and ISC will be made on or after February 14, 1996.

                    ARTICLE 7 - CLOSING CONDITIONS PRECEDENT

         The obligation of each of the parties to consummate the transactions to
be  performed  by  them  in  connection  with  the  Closing  is  subject  to the
satisfaction of each of the following conditions prior to or at the Closing:

         7.1 REPRESENTATIONS AND WARRANTIES.  The respective representations and
warranties of each of the parties made  hereunder  shall be true in all material
respects at and as of the Closing Date, with the same force and effect as though
made at and as of the Closing Date,  except for updates or changes  permitted or
contemplated by this Agreement.

         7.2  AGREEMENTS.  Each of the parties shall have performed and complied
in all material respects with all their respective  undertakings,  covenants and
agreements  required by this  Agreement to be performed or complied with by each
of them prior to or at the Closing.

         7.3  PERFORMANCE  CERTIFICATES.  Each of the  parties  shall  have been
furnished with a certificate  of a proper officer of SDC and ISC,  respectively,
both dated as of the Closing  Date,  each  certifying to the effect that each of
the  conditions  contained  in  Sections  7.1  and 7.2 (as  they  apply  to each
respective party) above has been satisfied in all respects.

         7.4 NO INJUNCTION.  No injunction,  restraining  order or decree of any
nature of any court or  governmental  or  regulatory  authority,  or any  claim,
controversy  or  allegation  of  any  third  party  regarding  the  business  or
distribution  rights  of ISC,  shall  exist  against  any  party or any of their
respective  Affiliates that restrains,  prevents or materially adversely changes
the transactions contemplated hereby.

         7.5 NO VIOLATION.  The  consummation of the  transactions  contemplated
hereunder shall not be in material violation of any applicable  agreement,  law,
statute,  rule or regulation  for which a waiver has not been obtained and where
such  violation   would  make  illegal  or  otherwise   impair  or  prevent  the
consummation  of the Merger or have a material  adverse  effect on the business,
prospects, operations or financial condition of ISC or SDC.

<PAGE>
                                       19

         7.6 CONSENTS. All material consents,  modifications to or amendments of
agreements,  approvals and  authorizations  of third parties,  governmental  and
regulatory  authorities,  and all  material  filings with and  notifications  of
governmental  authorities  and  regulatory  agencies  or  other  entities  which
regulate the business of ISC or the  Acquirors,  necessary on the part of ISC or
Acquirors,  to the execution and delivery of this Agreement and the consummation
of the transactions  contemplated  hereby,  shall have been obtained or effected
(and all applicable waiting periods,  if any, including any extensions  thereof,
under any applicable law, statute, regulation or rule, including but not limited
to the HSR Act, if applicable, shall have expired or terminated, as applicable).
ISC shall have received the written consents,  approvals or modifications of any
and  all  third  Persons  required  under  the  terms  of the  Contracts  to the
consummation of the transactions  contemplated  hereunder.  ISC's Agreement with
Check Point Software  Technologies  Ltd. shall be modified in a form  reasonably
acceptable  to SDC. With respect to any personal  obligation  of the  Exchanging
Stockholder under such Agreement,  including  without  limitation the Exchanging
Stockholder's guarantee obligation set forth in Section 29 of the Agreement, the
Exchanging  Stockholder shall be released from these obligations,  and SDC shall
agree to indemnify him for such obligations.

         7.7 OPINIONS OF COUNSEL.  ISC shall have  received an opinion of Testa,
Hurwitz & Thibeault,  counsel for the  Acquirors,  dated as of the Closing Date,
addressed to the Exchanging Stockholder, in the form and substance acceptable to
ISC and its  counsel.  SDC shall have  received an opinion of Goulston & Storrs,
counsel of the  Transferors,  dated as of the  Closing  Date,  addressed  to SDC
(regarding  due  authorization  and execution and no conflicts with Articles and
By-laws), in form and substance acceptable to SDC and its counsel.

         7.8 TAX-FREE  REORGANIZATION.  The Merger  shall  constitute a tax-free
reorganization under the provisions of Code Section 368.

         7.9 DUE DILIGENCE. [Intentionally Omitted].

         7.10  STOCKHOLDER  APPROVAL.  This  Agreement and the Merger shall have
been duly approved by the  stockholders of ISC in accordance with the applicable
provisions of the Massachusetts  Business Corporations Act and ISC's Articles of
Organization and By-laws, each as amended to date.

         7.11 EMPLOYMENT AGREEMENT. Richard Kosinski shall have entered into the
Employment and  Noncompetition  Agreement with SDC in substantially the form set
forth in Exhibit E and the same shall be in full force and effect.

         7.12 NO ADVERSE CHANGE.  Since December 31, 1994, there shall have been
no material  adverse  change in the  assets,  business,  operations,  results of
operations,  financial  condition,  or prospects of either of ISC or SDC, except
events or changes contemplated by this Agreement, changes consented to by SDC or
ISC and  changes  in the  ordinary  course of  business  which  are not,  either
individually  or in  the  aggregate,  materially  adverse  to  the  business  or
prospects of ISC or SDC.

         7.13  CONFIDENTIALITY  AND  NON-DISCLOSURE  AGREEMENTS.   Each  of  the
employees and consultants of ISC shall have entered into a  confidentiality  and
non-disclosure  agreement with ISC or SDC in substantially the form set forth in
Exhibit G  (collectively  the  "NON-DISCLOSURE  AGREEMENTS"  and  individually a
"NON-DISCLOSURE AGREEMENT"), and the same shall be in full force and effect.

<PAGE>
                                       20

         7.14  RESIGNATIONS.  The Acquirors  shall have  received  resignations,
effective  as of the Closing,  of each  officer and director of ISC,  other than
Richard  Kosinski  and those  persons whom SDC and Richard  Kosinski  shall have
specified in writing prior to the Closing.

         7.15 NO PROCEEDINGS. No claim, controversy,  action or other proceeding
shall be pending or threatened in writing with any court, governmental agency or
other entity  against any of the parties to this  Agreement  with respect to the
transactions contemplated by this Agreement or which materially adversely affect
the assets, property, operations, results of operations,  financial condition or
prospects of ISC or SDC.

         7.16  OPINION OF COOPERS &  LYBRAND.  SDC shall have  received a letter
from Coopers & Lybrand,  dated as of this Closing Date,  addressed to SDC to the
effect that the Merger qualifies as a pooling of interests  transaction pursuant
to  Accounting  Principles  Board  Opinion  No.  16,  "Accounting  for  Business
Combinations".

         7.17 ISC COMMON STOCK.  All shares of the capital stock of ISC owned by
the Exchanging  Stockholder  shall be free and clear of any and all Encumbrances
(other than transfer restrictions under applicable securities laws).

         7.18  SECURITIES  FILINGS.  SDC and the  Exchanging  Stockholder  shall
together  prepare all securities  filings  required to be made by the Exchanging
Stockholder  in connection  with the Merger,  including  without  limitation any
Schedule 13D Reports.

         7.19  DISTRIBUTION.  Prior to the Merger, ISC shall make a distribution
(the "CASH DISTRIBUTION") to the Exchanging  Stockholder of $231,000,  and shall
distribute to the Exchanging Stockholder the Chevy Blazer. At least fifteen (15)
days prior to the date the following  amounts are required to be remitted to the
appropriate  government entity,  ISC shall make an additional  distribution (the
"TAX  DISTRIBUTION")  to the  Exchanging  Stockholder  in an amount equal to the
difference between the Exchanging  Stockholder's actual federal and state income
Tax  liability  (including  the federal and state  income tax  liability of such
stockholder's  spouse if a joint tax return is filed for the 1995 calendar year)
and the Exchanging  Stockholder's federal and state income Tax liability of such
stockholder  (and such  stockholder's  spouse if a joint Tax return is filed for
the  1995  calendar   year)   determined   without   regard  to  the  Exchanging
Stockholder's  distributive share of items of income,  deductions,  gain loss or
credit from ISC (as  reflected  on the Form K-1 issued by ISC to the  Exchanging
Stockholder).  Following  the  distribution  and after giving effect to the Cash
Distribution and the Tax Distribution, ISC will have working capital of at least
$1.00 as of the Closing.  SDC guarantees that ISC will have  sufficient  legally
available  funds  to pay  such  Tax  Distribution,  and to the  extent  such Tax
Distribution  is not  itself  treated as a  tax-free  payment to the  Exchanging
Stockholder,  SDC and ISC  shall  jointly  and  severally  hold  the  Exchanging
Stockholder   harmless  on  account   thereof,   and  indemnify  the  Exchanging
Stockholder in an amount  sufficient to pay the tax  liability,  if any, on such
Tax  Distribution  ("grossed  up" to include any tax  liability  payable on such
indemnification payment).

         7.20 MISCELLANEOUS  CLOSING DELIVERIES.  Each of ISC and SDC shall have
received each of the following:

         (a) all documents,  instruments and other closing deliveries  specified
in Section 3.2(a) above; and

<PAGE>
                                       21

         (b) such  evidence  as each  party may  reasonably  request in order to
establish:  (i)  the  power  and  authority  of each  party  to  consummate  the
transactions contemplated by this Agreement; (ii) compliance with the conditions
of Closing set forth herein; and (iii) satisfactory  completion of all corporate
and  stockholder  proceedings  to be taken in connection  with the  transactions
contemplated  by this Agreement,  together with certified  copies of resolutions
duly  adopted by the  stockholders  and  directors of each party  approving  the
Merger and the execution and delivery of this Agreement and all other  corporate
action  necessary  to  enable  each  party  to  comply  with  the  terms of this
Agreement.

         Either party may waive any condition  specified in this Article 7 if it
executes a writing  so  stating at or prior to the  Closing or agrees to proceed
with the Closing.

        ARTICLE 8 - SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS

         8.1   SURVIVAL  OF   REPRESENTATIONS   AND   WARRANTIES.   All  of  the
representations  and warranties of the parties hereto contained in the Agreement
shall  survive the Closing (even if the damaged party knew or had reason to know
of any misrepresentation or breach of warranty at the time of Closing; provided,
however,  if the damaged party knew or had reason to know of such a breach prior
to the Closing and failed to object thereto in writing prior to the Closing, the
damaged  party shall not be entitled to  indemnification  under Article 9 except
and only to the extent of the increase in damages beyond the amount known by the
damaged  party at the  Closing) and continue in full force and effect for twelve
(12) months  following  the  Closing  Date,  as of which time they will  expire;
provided,  however, that the representations and warranties set forth in Section
4.11 regarding the status of ISC as a "Subchapter S" corporation, and income tax
and withholding tax Liabilities, shall survive the Closing for a period of three
(3) years. Any claims with respect to the foregoing  sentence under Sections 9.1
and 9.2 below must be asserted in writing with reasonable  particularity  by the
party making such claim prior to the end of the twelve  month period  referenced
above in order to perfect any right of  indemnity,  and the  obligations  of the
indemnifying  party under  Section 9.1 and 9.2 below with respect to such claims
shall continue until such claims have been resolved.

         8.2 SURVIVAL OF COVENANTS AND AGREEMENTS.  The respective covenants and
agreements of the parties  contained in this Agreement shall survive the Closing
without  limitation  as to time.  Any  claims  as to a breach of a  covenant  or
agreement  under  Sections  9.1 and 9.2 below must be asserted in writing by the
party making such claims.

                     ARTICLE 9 - INDEMNIFICATION AND ESCROW

         9.1  INDEMNIFICATION  OF SDC. The Exchanging  Stockholder shall defend,
indemnify  and hold harmless SDC and ISC  Acquisition,  and its  successors  and
assigns  (individual  an  "Acquiror  Indemnitee",   collectively  the  "Acquiror
Indemnitees") from, against, and in respect of the following:

                  (a) any and all losses,  damages,  deficiencies or liabilities
directly  caused  by  or  directly   resulting  from:  (i)  any  breach  of  the
representations and warranties of the Exchanging  Stockholder  contained in this
Agreement;  (ii) any failure by any of the  Transferors  to perform or otherwise
fulfill or comply with: (X) if this Agreement  shall have been  terminated,  any
covenant,  undertaking,  agreement or obligation  to be performed,  fulfilled or
complied  with by the  Exchanging  Stockholder  or ISC prior to or in connection
with the Closing;  or (Y) if the Closing shall occur,  any  undertaking or other
agreement  or  obligation  hereunder  to be  performed,  fulfilled  or otherwise
complied with by the Exchanging Stockholder after the Closing (including but not
limited to the  undertakings,  agreements and obligations to be performed by the
Exchanging  Stockholder  pursuant to Section 6.8); 

<PAGE>
                                       22

(iii)  any  unknown  Liabilities  of  ISC  which  constitute  a  breach  of  the
representations   set  forth  under   Section   4.4(b)   (and   subject  to  the
qualifications  set forth in the last sentence of Section  4.4(b);  (iv) any and
all  legal  fees  and  expenses  of  ISC  related  to  this  Agreement  and  the
transactions  contemplated  hereby in excess of  Thirty  Five  Thousand  Dollars
($35,000.00), plus applicable disbursements (the parties acknowledge that $5,000
has already been paid);  (v) any actual losses,  liabilities or damages incurred
by SDC or the Surviving Corporation by reason of or in connection with any claim
for a finder's  fee or brokerage  or other  commission  arising by reason of any
services  alleged to have been rendered to or on behalf of ISC or the Exchanging
Stockholder  with  respect to this  Agreement or the  transactions  contemplated
hereby  (but  excluding  any claim for a finder's  fee or  brokerage  commission
rendered on behalf of or at the request of SDC); and

                  (b)  any  and  all  actions,   suits,   proceedings,   claims,
liabilities,  demands,  assessments,  judgments,  interest, penalties, costs and
expenses,  including reasonable  attorneys' fees (whether or not incurred by the
Acquiror Indemnitees or in connection with investigating, defending, settling or
prosecuting  any action,  suit,  proceeding or claim against any of the Acquiror
Indemnitors  hereunder),  directly attributable (excluding indirect damages such
as  consequential  damages)  to any of the  items  referred  to  above  or  such
indemnification;  but only if the  Aquiror  Indemnitees  are  determined  by the
procedures set forth in Section 9.8 to be entitled to indemnification  under the
foregoing subsection (a) and only to the extent so determined by the arbitrators
or a court of final jurisdiction.

         If any action, suit, proceeding, claim, liability, demand or assessment
shall be  asserted  against  any  Acquiror  Indemnitee  in respect of which such
Acquiror Indemnitee proposes to demand indemnification, such Acquiror Indemnitee
shall  notify  the  Exchanging  Stockholder  thereof  promptly  after  assertion
thereof,  and such notice shall  include  copies of all suit,  service and claim
documents,  all other  relevant  documents  in the  possession  of the  Acquiror
Indemnitee,  and an explanation  of the Acquiror  Indemnitee's  contentions  and
defenses with as much specificity and particularity as the circumstances permit.
The failure of the Acquiror Indemnitee to give such notice shall not relieve the
Exchanging  Stockholder  of the  obligations  under  this  Section  9.1,  if the
Acquiror Indemnitee shall have demonstrated that: (i) it acted in good faith and
without  unreasonable delay; and (ii) the Exchanging  Stockholder shall not have
been prejudiced thereby.  Subject to rights of or duties to any insurer or other
third Person having liability  therefor,  the Exchanging  Stockholder shall have
the right within  fifteen  (15) days after  receipt of such notice to assume the
control of the defense,  compromise  or  settlement  of any such  action,  suit,
proceeding,  claim,  liability,  demand,  or assessment,  including,  at its own
expense, employment of counsel.

         If the Exchanging  Stockholder shall have exercised the right to assume
such  control,  the Acquiror  Indemnitee:  (i) may, in its sole  discretion  and
expense,  employ counsel to represent it (in addition to counsel employed by the
Exchanging  Stockholder) in any such matter,  and in such event counsel selected
by the Exchanging  Stockholder  shall be required to cooperate with such counsel
of the Acquiror  Indemnitee  in such defense,  compromise or settlement  for the
purpose of informing and sharing information with such Acquiror Indemnitee;  and
(ii) shall,  at its own expense,  make available to the  Exchanging  Stockholder
those  employees  of the Acquiror  Indemnitees  whose  assistance,  testimony or
presence  is  reasonably  deemed  by the  Exchanging  Stockholder  necessary  or
beneficial to assist the  Exchanging  Stockholder in evaluating and in defending
any such action, suit, proceeding,  claim, liability,  demand or assessment. Any
such access shall be conducted in such a manner as not to interfere unreasonably
with the operations of the businesses of the Acquiror Indemnitees.

         Nothing herein shall be deemed to constitute a waiver of the Exchanging
Stockholder's  right to  dispute  any  claims  of third  Persons,  provided  the
Exchanging  Stockholder,  in  connection  with  the  

<PAGE>
                                       23

resolution  of such  claim,  procures a complete  and  unconditional  release of
Acquiror  Indemnitees  from all claims of and liabilities to such third Persons.
The  Exchanging  Stockholder  shall have the right to settle or  compromise  any
claim without the consent of the Acquiror Indemnitees provided the terms thereof
provide for the unconditional  release of the Acquiror  Indemnitees and provided
further that the  Exchanging  Stockholder  agrees to refrain  from  settling any
claims without the consent of SDC where SDC shall have  reasonably  demonstrated
that the  circumstances  surrounding  the  settlement  of any such claims  could
result in an adverse impact upon the business,  operations,  assets or financial
position of SDC. No Acquiror Indemnitee shall undertake the determination of any
Liability that is subject to any claim for  indemnification  hereunder until the
Exchanging  Stockholder is first given the opportunity to settle,  compromise or
contest such Liability as provided herein.

         9.2  INDEMNIFICATION OF EXCHANGING  STOCKHOLDER.  SDC agrees to defend,
indemnify  and  hold  harmless  the  Exchanging   Stockholder  (the  "TRANSFEROR
INDEMNITEE") from, against and in respect of:

                  (a) any and all losses,  damages,  deficiencies or liabilities
caused by, resulting or arising from or otherwise relating to: (i) any breach of
the representations and warranties of the Acquirors contained in this Agreement;
(ii) any  failure by the  Acquirors  to perform or  otherwise  fulfill or comply
with: (X) if this Agreement shall have been  terminated,  Sections 6.4 or 6.6 or
any other  covenant,  undertaking,  agreement  or  obligation  to be  performed,
fulfilled,  or complied with by the Acquirors prior to or in connection with the
Closing;  or (Y) if the Closing shall occur,  any undertaking or other agreement
or obligation hereunder to be performed, fulfilled or otherwise complied with by
SDC after the Closing;  (iii) any  undisclosed  liabilities  of SDC which have a
material  adverse  effect on SDC's  business or results of  operation  and which
arise out of or relate to the conduct or  operation of SDC's  business  prior to
the Closing; and (iv) any actual losses,  liabilities or damages incurred by the
Exchanging  Stockholder  by  reason  of or in  connection  with any  claim for a
finder's fee or brokerage or other commission  arising by reason of any services
alleged  to have been  rendered  to SDC with  respect to this  Agreement  or the
transactions  contemplated hereby (but excluding any claim for a finder's fee or
brokerage  commission rendered on behalf of ISC or the Exchanging  Stockholder);
and

         (b) any and  all  actions,  suits,  proceedings,  claims,  liabilities,
demands,  assessments,  judgments,  interest,  penalties,  costs  and  expenses,
including reasonable  attorneys' fees (whether or not incurred by the Transferor
Indemnitee in connection with investigating,  defending, settling or prosecuting
any action, suit, proceeding or claim against SDC hereunder), incident to any of
the items referred to above or such indemnification;  but only if the Transferor
Indemnitee  is  determined  by the  procedures  set forth in  Section  9.8 to be
entitled to indemnification  under the foregoing  subsection (a) and only to the
extent  so  determined  by the  arbitrators  or a court of  final  jurisdiction,
provided,  however,  that if any action,  suit,  proceeding,  claim,  liability,
demand or  assessment  shall be asserted  against any  Transferor  Indemnitee in
respect of which such Transferor Indemnitee proposes to demand  indemnification,
such Transferor  Indemnitee shall notify SDC thereof within a reasonable  period
of time after  assertion  thereof,  and such notice shall include  copies of all
suit,  service  and  claim  documents,  all  other  relevant  documents  in  the
possession of the  Transferor  Indemnitee  and an  explanation of the Transferor
Indemnitee's contentions and defenses with as much specificity and particularity
as the  circumstances  permit,  provided  that  the  failure  of the  Transferor
Indemnitee  to give such notice shall not relieve SDC of its  obligations  under
this Section 9.2 if the Transferor  Indemnitee shall have demonstrated that: (i)
it acted in good faith and without  unreasonable  delay;  and (ii) SDC shall not
have been prejudiced  thereby.  Subject to rights of or duties to any insurer or
other third Person having  liability  therefor,  SDC shall have the right within
fifteen  (15) days  after  receipt of such  notice to assume the  control of the
defense,  compromise or settlement of any such action, suit, proceeding,  claim,
liability,  

<PAGE>
                                       24

demand, or assessment,  including, at its own expense, employment of counsel. If
SDC shall  have  exercised  its right to assume  such  control,  the  Transferor
Indemnitee:  (i) may, in his sole discretion and expense,  employ one counsel to
represent him (in addition to counsel  employed by SDC) in any such matter,  and
in such event counsel  selected by SDC shall be required to cooperate  with such
counsel of the Transferor  Indemnitee in such defense,  compromise or settlement
for the  purpose of  informing  and  sharing  information  with such  Transferor
Indemnitee.  Nothing  herein  shall be  deemed  to  constitute  a waiver  of the
Acquirors  right to  dispute  any  claims of third  Persons  provided  Acquirors
procure a complete and unconditional release of the Exchanging  Stockholder from
all claims of and  liabilities to such third Persons.  No Transferor  Indemnitee
shall undertake the  determination of any Liability that is subject to any claim
for   indemnification   hereunder  until  the  Acquirors  are  first  given  the
opportunity to settle, compromise or contest such Liability as provided herein.

         9.3  REMEDIES.  Except  as  otherwise  provided  in  Section  3.3,  the
indemnification  provisions of this Article 9 are the sole and exclusive  remedy
of any party for a breach of any representation, warranty or covenant, except to
the extent that  indemnification  is otherwise provided in Section 7.19 relating
to the Tax Distribution.  Notwithstanding  the preceding  sentence,  each of the
parties  acknowledges  and agrees that the other parties hereto would be damaged
irreparably  in the  event  any of the  provisions  of  this  Agreement  are not
performed in  accordance  with their  specific  terms or otherwise are breached.
Accordingly, each of the parties hereto agrees the other parties hereto shall be
entitled to an injunction or injunctions  to prevent  breaches of the provisions
of this Agreement and to enforce  specifically  this Agreement and the terms and
provisions  hereof in any competent court having  jurisdiction over the parties,
in addition to any other remedy to which they may be entitled, at law.

         9.4 SURVIVAL.  Notwithstanding  anything  herein to the contrary,  this
Article 9 shall survive termination of this Agreement.

         9.5 HOLDBACK. At the Effective Time, the Transferors shall be deemed to
have  directed SDC to withhold  from  issuance to the  Exchanging  Stockholder a
number  of  Merger  Shares  equal  to ten  percent  (10%) of the  Merger  Shares
otherwise deliverable to the Exchanging Stockholder.

         The Merger  Shares  withheld  are herein  referred to as the  "HOLDBACK
SHARES." The Holdback Shares shall be issuable to the Exchanging Stockholder but
held in  reserve  by SDC  subject to the terms and  conditions  hereinafter  set
forth.  The liability of the Exchanging  Stockholder  under the  indemnification
provisions of this Article 9 shall be recovered only from the  following:  first
from the  Holdback  Shares,  and  second  from  the  Merger  Shares  held by the
Exchanging  Stockholder  or proceeds of those  shares if the Merger  Shares have
been  previously sold or transferred by the Exchanging  Stockholder,  subject to
the  limitations  prescribed  by Section 9.10 hereof,  and in no event shall any
claim be made against any other assets of the Exchanging Stockholder.

         9.6 HOLDBACK  TERMINATION.  On the Closing  Date,  the Holdback  Shares
shall be held in escrow by SDC. The Holdback  Shares shall be distributed to the
Exchanging Stockholder as follows:

                  (a) On the date which is the earlier of (i) one year after the
Closing Date or (ii) forty-five days after the release of SDC's audited year-end
financial  statements  for the fiscal year ended March 31,  1996,  the  Holdback
Shares shall be distributed to the Exchanging  Shareholder,  except that portion
of the Holdback  Shares  having a value as of such date most nearly equal to the
amounts of all  indemnifiable  damages  and  expenses  actually  incurred by the
Acquiror  Indemnitees  and expenses  related  thereto as to which a Claim Notice
shall have been  previously  and duly  delivered  to the  Transferors,  shall be
withheld  in  escrow.  The value of such  claims  shall be based  upon a written

<PAGE>
                                       25

certification  of the  Chief  Executive  Officer  of SDC  as to  the  amount  of
indemnifiable  damages and expenses actually incurred,  together with supporting
documentation.  The  balance of the  Holdback  Shares not so  withheld  shall be
distributed to the Exchanging Stockholder.

                  (b) The Holdback  Shares not so  distributed to the Exchanging
Stockholder  pursuant to  subsection  9.6(a)  shall be retained by SDC in escrow
until  such  pending  claims  are  resolved;  provided,  however,  that upon the
disposition of any such claim prior to the  disposition of all such claims,  SDC
shall  distribute  to the  Exchanging  Stockholder  that amount of the  Holdback
Shares having a value as of such date in excess of 100% of the aggregate amounts
of the remaining damages and expenses actually incurred as determined above.

         9.7 ASSERTION OF CLAIMS AGAINST HOLDBACK. Subject to the minimum claims
requirements set forth below, if any Acquiror Indemnitee shall have any claim of
indemnification  pursuant to Article 9 hereof,  it shall  promptly  give written
notice thereof to the Exchanging  Stockholder,  including in such notice a brief
description  of the facts upon which such claim or  adjustment  is based and the
amount thereof (the "Claim Notice").

         9.8 RESOLUTION OF CONFLICTS; ARBITRATION.

         The following  provisions  shall apply with respect to the assertion of
claims and the  indemnification  provisions of this Article 9 of the  Exchanging
Stockholder against SDC or SDC against the Exchanging Stockholder.

                  (a) SDC shall continue to hold in reserve the Holdback  Shares
until the rights of the Exchanging Stockholder and SDC with respect thereto have
been  agreed  upon  between  the  Exchanging  Stockholder  and SDC or until such
matters are settled by arbitration.

                  (b) The Exchanging  Stockholder and SDC shall attempt promptly
and in good faith to agree upon the rights of the parties  with  respect to each
of such  claims.  If the  Exchanging  Stockholder  and SDC  should so  agree,  a
memorandum  setting  forth such  agreement  shall be prepared and signed by both
parties and the Holdback  Shares shall be distributed or forfeited in accordance
with the terms thereof.

                  (c) If no such  agreement  can be  reached  after  good  faith
negotiation,  either SDC or the Exchanging Stockholder may demand arbitration of
the  matter  unless  the  amount of the  damage  or loss is at issue in  pending
litigation with a third party, in which event arbitration shall not be commenced
until such amount is  ascertained or both parties agree to  arbitration;  and in
any such event the matter shall be settled by arbitration  conducted by a single
arbitrator  mutually  agreeable to the Exchanging  Stockholder  and SDC, or if a
single  arbitrator  cannot be agreed to by the parties  within thirty (30) days,
then by  three  arbitrators.  In the  event of  three  arbitrators,  SDC and the
Exchanging Stockholder shall each select one arbitrator, and the two arbitrators
so selected shall select a third arbitrator.  The decision of the arbitrators so
selected as to the  validity  and amount of any claim in such Claim Notice shall
be binding and conclusive  upon the parties to this  Agreement,  and the parties
shall  act in  accordance  with  such  decision  and make  distributions  of the
Holdback Shares in accordance therewith. Judgment upon any award rendered by the
arbitrators  may  be  entered  in  any  court  having  jurisdiction.   Any  such
arbitration  shall  be  held in  Norfolk  County,  Massachusetts  and  shall  be
conducted   under  the  rules  then  in  effect  of  the  American   Arbitration
Association,  and  shall be  based on the  provisions  and  limitations  of this
Article 9.

<PAGE>
                                       26

         9.9 BENEFICIAL  INTEREST.  Subject to the rights of SDC hereunder,  all
beneficial  interest  in  the  Holdback  Shares  shall  be the  property  of the
Exchanging  Stockholder  from and after the  Closing  Date and SDC shall have no
interest  therein.  Any cash or stock  dividends  or  other  distributions  with
respect  to the  Holdback  Shares  shall be deemed  to be added to the  Holdback
Shares and all such distributions  shall accrue to the benefit of the Exchanging
Stockholder in proportion to the amounts of the Holdback  Shares  distributed to
the Exchanging Stockholder.  The Exchanging Stockholder shall have voting rights
with respect to Holdback  Shares until such time, if any, as the Holdback Shares
are forfeited to SDC.

         9.10 LIMITATION ON LIABILITY.  (a) Notwithstanding any provision to the
contrary in this Article 9, no claim,  either  individually or in the aggregate,
for indemnification  hereunder, shall be valid and assertable unless such claims
in the  aggregate  are equal to or greater  than  Twenty-Five  Thousand  Dollars
($25,000) (the "BASKET  DEDUCTIBLE"),  in which case, subject to the limitations
set forth in Section 9.10(b),  the indemnifying  party shall be liable for those
amounts which exceed the Basket Deductible  provided,  however,  that the Basket
Deductible  shall not apply with respect to claims made pursuant to clauses (iv)
and (v) of subsection 9.1(a) above.

         (b) In no  event  shall  the  aggregate  liability  of  the  Exchanging
Stockholder  for  indemnification  hereunder  or  otherwise  arising  out  of or
relating to this  Agreement  exceed Seven  Hundred  Fifty  Thousand  ($750,000);
provided,  however,  that the  Exchanging  Stockholder's  maximum  liability for
indemnification  for claims brought by SDC pursuant to Section 9.1(a)(iii) shall
be  limited  to a  maximum  of  Three  Hundred  Seventy  Five  Thousand  Dollars
($375,000). In no event shall the aggregate liability of SDC and ISC Acquisition
for  indemnification  hereunder or otherwise  arising out of or relating to this
Agreement exceed Seven Hundred Fifty Thousand Dollars ($750,000).  The aggregate
liability of SDC and ISC Acquisition shall be reduced, dollar for dollar, by the
amount of any proceeds received by the Exchanging  Stockholder on the subsequent
sale of Merger  Shares.  The foregoing  shall not limit any  indemnification  to
which the Exchanging  Stockholder would be entitled as an officer or director of
SDC or  ISC,  unless  any  proceeding  directly  involves  a  matter  for  which
indemnification  is being  specifically  sought by SDC  against  the  Exchanging
Stockholder  pursuant to the terms of this  Article IX and in such event only to
the extent that SDC is entitled to indemnification under Article IX (except that
expenses will not be advanced to the  Exchanging  Stockholder  in any matter for
which  SDC is  seeking  indemnification  until a final  determination  that  the
Exchanging Stockholder is not obligated to indemnify SDC hereunder.

         (c) Subject to the second  paragraph of Section 9.5, claims of Acquiror
Indemnitees  hereunder shall be satisfied only by the return of Merger Shares or
forfeiture  of Holdback  Shares.  Acquiror  Indemnitees  shall have the right to
recover  the  proceeds of any such  Merger  Shares  that are sold by  Exchanging
Stockholder.  The limitation set forth in this subsection (c) shall not apply in
the  event  that  the   Exchanging   Stockholder's   or  SDC's   liability   for
indemnification,   as   the   case   may   be,   is   based   upon   intentional
misrepresentations or other fraudulent conduct.

         (d)  The  parties  agree  that,  prior  to  submitting  any  claim  for
indemnification  under  this  Article 9, they  shall use  reasonable  efforts to
determine  the amount,  if any, by which their  losses  would be offset by SDC's
recovery of insurance  proceeds and reduction of tax  liabilities and to provide
the  Indemnitor  notice of and a description of such  determination.  All Claims
Notices  shall  provide  for  appropriate   adjustments  as  a  result  of  such
reductions.

         (e) No claim for  indemnification  can be made by any party against the
other party hereunder if the claim is asserted after twelve (12) months from the
date of the Effective Time. Notwithstanding anything contained in this Agreement
to the  contrary,  claims under Section 7.19, or for a violation of 

<PAGE>
                                       27

Exhibit H or other  provisions  which by their terms continue beyond such twelve
month period, shall survive such twelve-month period.  Notwithstanding  anything
in this Agreement to the contrary,  the representations and warranties set forth
in Section 4.11 of this  Agreement  with respect to the tax treatment and status
of ISC as a  "Subchapter  S"  corporation  and  income tax and  withholding  tax
Liabilities  shall  survive the  Effective  Time for a period of three (3) years
(subject to the limitations on liability and related indemnification  obligation
of the Exchanging Stockholder set forth in 9.10(b)).

                           ARTICLE 10 - MISCELLANEOUS

         10.1  FURTHER  ASSURANCES.  From time to time at or after the  Closing,
each of the parties agrees to take, or cause to be taken,  such further actions,
to execute, deliver and file, or cause to be executed, delivered and filed, such
further documents and instruments,  and to obtain consents,  as may be necessary
or reasonably  requested in order to fully  effectuate  the purposes,  terms and
conditions of this Agreement.

         10.2  EXPENSES.  Each of the parties  hereto shall bear its  respective
legal,  investment  banking,  accounting,  audit,  and other costs and  expenses
associated  with  this  Agreement  and  the  consummation  of  the  transactions
contemplated  hereby;  provided,  however,  that such costs and  expenses of ISC
shall  not  exceed  Thirty  Five  Thousand  Dollars  ($35,000)  plus  incidental
disbursements, if the Closing shall occur, and the Exchanging Stockholder shall,
as provided in Section  9.1,  indemnify  the Acquiror  Indemnitees  for any such
costs and  expenses of ISC in excess of such  amounts  and any of the  following
expenses not approved in advance by SDC. The parties  agree that the  obligation
to pay fees of American  Systems &  Technology,  Inc.  and Wagner  Resources  as
disclosed,  shall not be counted  against the foregoing cap on expenses.  All of
ISC's legal,  investment  banking,  accounting,  and other professional fees and
expenses  unrelated to this Agreement and the transactions  contemplated  hereby
must be approved in advance by SDC.

         10.3  APPLICABLE LAW. Except as otherwise  expressly  provided  herein,
this Agreement  shall be governed by, and construed in accordance  with, the law
of the Commonwealth of Massachusetts without reference to any choice or conflict
of law  principle,  provision or rule,  including  all matters of  construction,
venue, validity and performance.

         10.4 NOTICES. All notices,  requests,  permissions,  waivers, and other
communications  hereunder  shall be in writing  and shall be deemed to have been
duly given (i) upon  personal  delivery  or receipt of a telecopy  transmission,
(ii) two (2) days after being sent by first class United  States  mail,  postage
prepaid, or (iii) one (1) day after being transmitted by a nationally recognized
overnight  courier  service or by electronic  facsimile  transmission,  properly
addressed  and  postage  prepaid  to the  intended  recipient.  A copy  shall be
forwarded to the legal representatives of each of the Exchanging Stockholder and
SDC.

         10.5 ENTIRE  AGREEMENT.  This  Agreement  (including  the  Exhibits and
Schedules attached hereto and the documents referred to herein, all of which are
a part hereof) constitutes the entire agreement and understanding of the parties
hereto with  respect to the subject  matter  contained  herein,  supersedes  and
cancels all prior  agreements,  negotiations,  correspondence,  undertakings and
communications of the parties,  oral or written,  respecting such subject matter
(including,  without  limitation,  the letter of intent  dated  August 28, 1995,
which   is   hereby   terminated).   There   are  no   restrictions,   promises,
representations, warranties, agreements or undertakings of any party hereto with
respect  to the  transactions  under this  Agreement  other than those set forth
herein or made hereunder.

<PAGE>
                                       28

         10.6  AMENDMENTS.  This  Agreement  may be  amended  only by a  written
instrument executed by the parties or their respective successors or assigns.

         10.7  COUNTERPARTS.  This  Agreement  may be  executed  in one or  more
counterparts and each counterpart shall be deemed to be an original.

         10.8 PARTIES IN INTEREST; ASSIGNMENT. This Agreement shall inure to the
benefit  of  and be  binding  upon  the  parties  hereto  and  their  respective
successors. Nothing in this Agreement, express or implied, is intended to confer
upon any Person not a party to this Agreement any rights or remedies under or by
reason of this Agreement.  No party to this Agreement may assign or delegate all
or any portion of its rights,  obligations or  liabilities  under this Agreement
without the prior written consent of the other parties to this Agreement.

         10.9  SEVERABILITY;  ENFORCEMENT.  The invalidity of any portion hereof
shall not affect the validity, force or effect of the remaining portions hereof.
If it is ever  held  that any  restriction  hereunder  is too  broad  to  permit
enforcement of such restriction to its fullest extent,  each party agrees that a
court of  competent  jurisdiction  may enforce such  restriction  to the maximum
extent  permitted by law,  and each party  hereby  consents and agrees that such
scope may be  judicially  modified  accordingly  in any  proceeding  brought  to
enforce such restriction.

         10.10  WAIVER.  Any of the  conditions  to  Closing  set  forth in this
Agreement may be waived at any time prior to or at the Closing  hereunder by the
party  entitled  to the  benefit  thereof.  The  failure of any party  hereto to
enforce at any time any of the provisions of this  Agreement  shall in no way be
construed  to be a waiver of any such  provision,  nor in any way to affect  the
validity  of this  Agreement  or any part  hereof  or the  right  of such  party
thereafter to enforce each and every such provision.  No waiver of any breach of
or non-compliance  with this Agreement shall be held to be a waiver of any other
or subsequent breach or non-compliance.

         10.11 INCORPORATION OF EXHIBITS AND SCHEDULES.  All of the Exhibits and
Schedules  identified in this Agreement are  incorporated by reference into this
Agreement and made a part hereof.

         10.12 CONSTRUCTION. The parties hereto have participated jointly in the
negotiation  and drafting of this  Agreement.  In the event of any  ambiguity or
question of intent or interpretation  arises,  this Agreement shall be construed
as if grafted  jointly by the  parties  hereto and no  presumption  or burden of
proof shall  arise  favoring or  disfavoring  any party  hereto by virtue of the
authorship of any of the provisions of this Agreement.

                       [Signature Page on Following Page]


<PAGE>
                                       29

         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
Agreement as of the date first above written.


THE SOFTWARE DEVELOPER'S            INTERNET SECURITY CORPORATION
COMPANY, INC.

BY:   /S/ BARRY N. BYCOFF           BY:   /S/ RICHARD KOSINSKI             
   BARRY N. BYCOFF, PRESIDENT          RICHARD KOSINSKI, PRESIDENT



ISC ACQUISITION CORP.               EXCHANGING STOCKHOLDER:

BY:   /S/ BARRY N. BYCOFF              /S/ RICHARD KOSINSKI                 
   BARRY N. BYCOFF, PRESIDENT       RICHARD KOSINSKI, PERSONALLY

<PAGE>

                                    EXHIBIT A

                                   ISC SHARES

<TABLE>
<CAPTION>
Name                                                         Shares
<S>                                                          <C>  
Richard Kosinski                                             2,500
</TABLE>

<PAGE>
 
                                  EXHIBIT B

                         FORM OF ARTICLES OF MERGER (MA)

         To be  executed  in a form  satisfactory  to all  parties  prior to the
Effective Time.


<PAGE>

                                    EXHIBIT C

                            ISC FINANCIAL STATEMENTS



         The following financial statements are attached to this Exhibit C.

      1. Unaudited balance sheet, statements of income, changes in stockholders'
         equity and cash flows for the periods ended December 31, 1994.

      2. Unaudited balance sheet,  statement of income, changes in stockholders'
         equity and cash flow for the period ended June 30, 1995.

      3. Unaudited balance sheet,  statement of income, changes in stockholders'
         equity and cash flow for the month ended September 30, 1995.


<PAGE>


                                    EXHIBIT D

               FORM OF LEGAL OPINION OF TESTA, HURWITZ & THIBEAULT

(Intentionally Omitted)



<PAGE>


                                    EXHIBIT E

                      FORM OF KOSINSKI EMPLOYMENT AGREEMENT


<PAGE>


                                    EXHIBIT F

                   FORM OF LEGAL OPINION OF GOULSTON & STORRS

(Intentionally Omitted)



<PAGE>


                                    EXHIBIT G

                        FORM OF NON-DISCLOSURE AGREEMENT

         The employees will execute a form of Non-Disclosure Agreement in a form
mutually agreeable to the parties hereto.


<PAGE>


                                    EXHIBIT H

                               REGISTRATION RIGHTS


         REGISTRATION  RIGHTS.  SDC  hereby  grants the  following  registration
rights with respect to the SDC Common Stock issued to the Exchanging Stockholder
as the Merger Shares.  Such Merger Shares, for purposes of this Exhibit H, shall
be referred to as the "Registrable Shares."

         1.1. "PIGGY-BACK" REGISTRATIONS:  If at any time SDC shall determine to
register in a public  offering for its own account under the 1933 Act any of its
Common Stock, it shall send to the Exchanging Stockholder written notice of such
determination  and,  if  within  15  days  after  receipt  of such  notice,  the
Exchanging  Stockholder  shall so  request  in  writing,  SDC shall use its best
efforts  to  include  in  such  registration  statement  all or any  part of the
Registrable Shares the Exchanging  Stockholder  requests to be registered.  This
right shall not apply to a  registration  of shares of SDC Common  Stock on Form
S-8 or Form S-4 (or their  then  equivalents)  relating  to shares of SDC Common
Stock to be issued by SDC in connection  with any  acquisition  of any entity or
business,  or shares of SDC Common Stock  issuable in connection  with any stock
option or other employee benefit plan.

         If, in connection  with any offering  involving an  underwriting of SDC
Common Stock to be issued by the Company,  the managing underwriter shall impose
a  limitation  on the  number of shares of such SDC  Common  Stock  which may be
included in any such  registration  statement  because,  in its  judgment,  such
limitation  is necessary  to effect an orderly  public  distribution  of the SDC
Common Stock and to maintain a stable market for the  securities of the Company,
then the Company  shall be obligated to include in such  registration  statement
only such limited portion (which may be none) of the stock with respect to which
the Exchanging Stockholder has requested inclusion hereunder.

         1.2. OTHER REGISTRATION RIGHTS. After February 15, 1996, SDC will, upon
the  written  request of the  Exchanging  Stockholder,  use its best  efforts to
promptly effect  qualification and registration of the Registrable  Shares under
the Securities Act on Form S-3 (or any other form for which it is then eligible)
as a "shelf"  registration,  or with the consent of the Exchanging  Stockholder,
pursuant  to an  underwriter's  offering.  SDC shall not be required to effect a
registration  pursuant  to this  Section  1.2  unless  the  market  value of the
securities to be sold in any such registration shall be estimated to be at least
$250,000  at the time of filing of such  registration  statement.  The rights to
demand  registration  set forth in this  Section 1.2 shall expire two years from
the date of this Agreement. Subject to extension as provided in the next to last
sentence  of this  Section  1.2,  SDC agrees to keep  effective  and current any
registration statement filed under this Section 1.2 for a period required by the
Exchanging  Stockholder to complete the  distribution of the securities,  but in
any  event  not  less  than  360  days  following  the  effective  date  of  the
registration  statement,  subject  to  SDC's  right to  delay  or  abandon  such
registration  pursuant to Section 1.5 below.  If, because of the exercise of its
rights  under  Section 1.5, SDC is unable to keep  effective  such  registration
statement  for the  twelve-month  period  following  the exercise of such demand
registration rights, and the Exchanging  Stockholder has not yet disposed of his
Registrable  Shares,  the  Company  will use its best  efforts  to  provide  the
Exchanging Stockholder with additional registrations on Form S-3 (or other form)
so as to provide the Exchanging Stockholder with an opportunity for registration
of the Merger Shares on Form S-3 (or other form) for a minimum  period of twelve
(12) months of effective  registration  during the two-year period following the
consummation of the Merger.  Without derogating from the foregoing  obligations,
if such minimum  twelve-month  period is not provided during the two-year period
following the consummation of the Merger, then the obligations set forth in this
Section 1.2 shall  continue  beyond such  two-year  period in order to provide a
minimum  of   

<PAGE>

twelve-months in the aggregate during which the Exchanging  Stockholder may sell
Registrable  Shares. SDC shall use reasonable efforts to coordinate sales of the
Merger Shares with SDC's market makers.

         1.3. EXPENSES. In the case of a registration under Section 1.1 and 1.2,
the  Company  shall  bear all costs  and  expenses  of each  such  registration,
including,  but not limited to, printing, legal and accounting expenses, SEC and
NASD  filing  fees and all  related  "Blue  Sky"  fees and  expenses;  provided,
however,  that the Company shall have no obligation to pay or otherwise bear any
portion  of the  underwriters'  commissions  or  discounts  attributable  to the
securities being offered and sold by the Exchanging Stockholder, or the fees and
expenses  of any  counsel or other  advisor for the  Exchanging  Stockholder  in
connection with the registration of the securities.

         1.4. EXPIRATION OF REGISTRATION  RIGHTS. The obligations of the Company
under  this  Exhibit H to  register  the  Registrable  Shares  shall  expire and
terminate  at such  time as the  Exchanging  Stockholder  shall be  entitled  or
eligible to sell such securities without  restriction and without a need for the
filing of a registration  statement under the Securities Act,  including without
limitation,  for any resales of restricted  securities made pursuant to Rule 144
as promulgated by the Securities and Exchange Commission.

         1.5.  DELAY OF  REGISTRATION.  For a period not to exceed 90 days,  SDC
shall not be obligated to prepare and file,  or be  prevented  from  delaying or
abandoning,  a  registration  statement  at any time when SDC, in its good faith
judgment  by its Board of  Directors,  upon the  advice of  counsel,  reasonably
believes:

         (a) that the filing thereof at the time  requested,  or the offering of
securities pursuant thereto, would materially and adversely affect (a) a pending
or scheduled  public offering or private  placement of SDC's  securities,  (b) a
pending or proposed acquisition, merger, consolidation or similar transaction by
or of SDC, (c) pre-existing and continuing negotiations,  discussions or pending
proposals  with  respect  to any  of  the  foregoing  transactions,  or (d)  the
financial  condition  of SDC,  in  view  of the  disclosure  of any  pending  or
threatened litigation, claim, assessment or governmental investigation which may
be required thereby; and

         (b) that the failure to disclose any material  information with respect
to the  foregoing  would cause a  violation  of the 1933 Act or the 1934 Act and
result in potential liability to SDC, and such disclosure could be delayed if no
sales were then being made under a currently effective registration statement.

         In lieu of abandoning a currently effective registration statement, SDC
may notify the Exchanging  Stockholder  that it must suspend  selling under such
registration  statement for a period of up to 90 days for the foregoing reasons,
which  suspension  shall be treated as an  abandonment  for the purposes of this
Section 1.5.

         1.6.  EFFECTIVENESS.  From  time to time,  the  Company  will  amend or
supplement such registration  statement and the prospectus  contained therein to
the  extent  necessary  to  comply  with the 1933 Act and any  applicable  state
securities  statute or  regulation.  The Company will also provide the holder of
Registrable  Shares with as many copies of the prospectus  contained in any such
registration statement as it may reasonably request.

         1.7. INDEMNIFICATION OF HOLDER OF REGISTRABLE SHARES. In the event that
the Company  registers  any of the  Registrable  Shares  under the 1933 Act, the
Company will  indemnify and hold 
 
<PAGE>

harmless each holder so registered  (including any broker or dealer through whom
such shares may be sold) and each Person,  if any,  who controls  such holder or
any such  underwriter  within the meaning of Section 15 of the 1933 Act from and
against any and all losses, claims, damages,  expenses or liabilities,  joint or
several,  to which  they or any of them  become  subject  under  the  1933  Act,
applicable  state securities laws or under any other statute or at common law or
otherwise, as incurred, and, except as hereinafter provided, will reimburse each
such holder and each such  controlling  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 in the registration statement under which
such  securities  were  registered  under the 1933 Act,  in any  preliminary  or
amended  preliminary  prospectus or in the final prospectus (or the registration
statement  or  prospectus  as from time to time amended or  supplemented  by the
Company),  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, in the light of the circumstances in which
they were made, not  misleading,  or any violation by the Company of any rule or
regulation  promulgated  under  the  1933  Act  or  any  state  securities  laws
applicable  to the  Company and  relating to action or inaction  required of the
Company in connection with such registration.

         Notwithstanding the foregoing,  the Company shall have no obligation to
indemnify  any holder or  controlling  person if: (i) such untrue  statement  or
omission  was  made in  such  registration  statement,  preliminary  or  amended
preliminary  prospectus  or final  prospectus in reliance upon and in conformity
with information  furnished in writing to the Company in connection therewith by
such  holder  of  Registrable  Shares  (in the case of  indemnification  of such
holder)  or such  controlling  Person  (in the case of  indemnification  of such
controlling  Person)  expressly  for use therein,  or (ii) in the case of a sale
directly  by  such  holder  of  Registrable  Shares  (including  a sale  of such
Registrable   Shares  through  any  underwriter   retained  by  such  holder  of
Registrable  Shares to engage in a distribution  solely on behalf of such holder
of Registrable  Shares),  such untrue  statement or alleged untrue  statement or
omission or alleged  omission was  contained  in a  preliminary  prospectus  and
corrected  in a final or amended  prospectus  copies of which were  delivered to
such holder of Registrable  Shares or such  underwriter  on a timely basis,  and
such  holder of  Registrable  Shares  failed  to  deliver a copy of the final or
amended  prospectus  at or  prior  to  the  confirmation  of  the  sale  of  the
Registrable  Shares to the  person  asserting  any such loss,  claim,  damage or
liability in any case where such delivery is required by the 1933 Act.

         1.8.  INDEMNIFICATION  OF  COMPANY.  In  the  event  that  the  Company
registers any of the Registrable Shares under the Securities Act, each holder of
the  Registrable  Shares so  registered  will  indemnify  and hold  harmless the
Company,  each of its  directors,  each  of its  officers  who  have  signed  or
otherwise  participated in the preparation of the registration  statement,  each
underwriter  of the  Registrable  Shares so registered  (including any broker or
dealer through whom such of the shares may be sold) and each Person, if any, who
controls  the Company  within the meaning of Section 15 of the 1933 Act from and
against any and all losses, claims, damages,  expenses or liabilities,  joint or
several,  to which  they or any of them may become  subject  under the 1933 Act,
applicable  state securities laws 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,  underwriter 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 of a material fact
contained  in  the  registration   statement,  in  any  preliminary  or  amended
preliminary  prospectus  or in the  final  prospectus  (or  in the  registration
statement or prospectus as from time to time amended or  

<PAGE>

supplemented)  or arise out of or are based upon the omission to state therein a
material  fact  required to be stated  therein or necessary in order to make the
statements  therein  not  misleading,  but  only to the  extent  that  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 such
holder  of  Registrable  shares  expressly  for  use  therein.   The  Exchanging
Stockholder's  obligations  hereunder shall be limited to an amount equal to the
proceeds  received  by such  holder  of  Registrable  Shares  sold  in any  such
registration.

         1.9.     INDEMNIFICATION PROCEDURES AND CONTRIBUTION.

                  (A) CONDUCT OF INDEMNIFICATION  PROCEEDINGS.  If any action or
proceeding  (including  any  governmental  investigation)  shall be  brought  or
asserted  against  any  person  entitled  to  indemnification  under  above  (an
"INDEMNIFIED  PARTY") in respect of which indemnity may be sought from any party
who has agreed to provide such  indemnification (an "INDEMNIFYING  PARTY"),  the
Indemnifying Party shall assume the defense thereof, including the employment of
counsel selected by the Indemnifying  Party, and shall assume the payment of all
expenses. Such Indemnified Party shall have the right to employ separate counsel
in any such action and to participate in the defense  thereof,  but the fees and
expenses of such counsel shall be at the expense of such Indemnified  Party. The
Indemnifying  Party shall not be liable or any  settlement of any such action or
proceeding effected without its written consent, but if settled with its written
consent, or if there be a final judgment for the plaintiff in any such action or
proceeding,  the  Indemnifying  Party shall  indemnify  and hold  harmless  such
Indemnified Parties from and against any loss or liability (to the extent stated
above) by reason of such settlement or judgment.

                  (B)  CONTRIBUTION.  In order to provide for just and equitable
contribution  to joint  liability  under  the 1933 Act in any case in which  the
Company or any holder of  Registrable  Shares  exercising  its rights under this
Exhibit H, makes a claim for indemnification pursuant to Section 1.7 or 1.8, but
it is  judicially  determined  (by the entry of a final  judgment or decree by a
court of  competent  jurisdiction  and the  expiration  of time to appeal or the
denial  of the last  right  of  appeal)  that  such  indemnification  may not be
enforced  in such case  notwithstanding  that  Section 1.7 or 1.8  provides  for
indemnification,  in such case, then, the Company and such holder of Registrable
Shares will contribute to the aggregate losses,  claims,  damages or liabilities
to which they may be subject (after contribution from others) in such proportion
as is  appropriate  to reflect the relative fault of the Company on the one hand
and of the  holder of  Registrable  Shares on the other in  connection  with the
statements  or  omissions  which  resulted in such  losses,  claims,  damages or
liabilities,  as well as any other relevant equitable  considerations or, if the
allocation  provided  herein  is  not  permitted  by  applicable  law,  in  such
proportion as shall be appropriate to reflect the relative  benefits received by
the  Company  and any holder of  Registrable  Shares  from the  offering  of the
Securities  covered by such  registration  statement.  The relative fault of the
Company  on the one hand and of the  holder of  Registrable  Shares on the other
shall be determined  by reference to, among other things,  whether the untrue or
alleged untrue  statement of a material fact or omission or alleged  omission to
state a material fact relates to information  supplied by the Company on the one
hand or by the  holder of  Registrable  Shares on the  other,  and each  party's
relative intent, knowledge,  access to information and opportunity to correct or
prevent such statement or omission;  provided,  however, that, in any such case,
(A) no such holder of  Registrable  Shares will be  required to  contribute  any
amount in excess of the proceeds  received by such holder of Registrable  Shares
offered by it  pursuant  to such  registration  statement;  and (B) no person or
entity  guilty of  fraudulent  misrepresentation  (within the meaning of Section
11(f) of the 1933 Act)  will be  entitled  to  contribution  from any  person or
entity who was not guilty of such fraudulent misrepresentation.

<PAGE>

         1.10. EXCHANGE ACT REGISTRATION. The Company shall timely file with the
Commission  such  information  as the Commission may require under Section 13 or
15(d) of the  Exchange  Act; and in such event,  the Company  shall use its best
efforts to take all  action  pursuant  to Rule  144(c) as may be  required  as a
condition to the  availability  of Rule 144 under the 1933 Act (or any successor
exemptive  rule  hereinafter  in effect) with respect to such Common Stock.  The
Company shall furnish to any holder of Registrable Shares forthwith upon request
(i) a written  statement by the Company as to its compliance  with the reporting
requirements of Rule 144(c),  (ii) a copy of the most recent annual or quarterly
report  of the  Company  as filed  with the  Commission,  and (iii)  such  other
publicly-filed  reports  and  documents  as a holder may  reasonably  request in
availing itself of any rule or regulation of the Commission allowing a holder to
sell any such Registrable Securities without registration.

         1.11. FURTHER OBLIGATIONS OF THE COMPANY.  Whenever under the preceding
Sections  of this  Exhibit H, the  Company is  required  hereunder  to  register
Registrable Shares, it agrees that it shall also do the following:

                  (A)  Furnish  to  each  selling  holder  such  copies  of each
preliminary  and final  prospectus  and such other  documents as said holder may
reasonably request to facilitate the public offering of its Registrable Shares;

                  (B)  Use  its  best   efforts  to   register  or  qualify  the
Registrable  Shares covered by said registration  statement under the applicable
securities or "blue sky" laws of such  jurisdictions  as any selling  holder may
reasonably request;  provided,  however, that the Company shall not be obligated
to qualify to do business in any jurisdictions where it is not then so qualified
or to take any action which would subject it to local taxation or the service of
process  in suits  other  than  those  arising  out of the  offer or sale of the
securities covered by the registration statement in any jurisdiction where it is
not then so subject or to conform the  composition  of its assets at the time to
the securities or "Blue Sky" laws of any jurisdiction;

                  (D) Furnish to each  selling  holder of  Registrable  Shares a
copy  of  all  documents  filed  with  and  all  correspondence  from  or to the
Commission in connection with any such offering of securities; and

                  (E) Use its  best  efforts  to  insure  the  obtaining  of all
necessary  approvals from the National  Association of Securities  Dealers,  Inc
(the "NASD").

                  Whenever  under the  preceding  Sections of this Exhibit H the
holders of  Registrable  Shares are  registering  such  shares  pursuant  to any
registration  statement,  each  such  holder  agrees to  timely  provide  to the
Company,  at its  request,  such  written  information  and  materials as it may
reasonably  request  in order to effect  the  registration  of such  Registrable
Shares.

         1.12 TRANSFERABILITY OF REGISTRATION RIGHTS. Notwithstanding everything
to the contrary in this  Agreement,  the Exchanging  Stockholder  may assign his
rights  under this  Exhibit H to not more than two  transferees  of  Registrable
Shares, holding in the aggregate not more than 10% of the Merger Shares.

<PAGE>

                          INTERNET SECURITY CORPORATION

                             DISCLOSURE SCHEDULES TO
                          AGREEMENT AND PLAN OF MERGER
                                October 17, 1995





                                                                    Exhibit 7.02


               AMENDMENT NO. 1 TO THE AGREEMENT AND PLAN OF MERGER

                                      AMONG

                     THE SOFTWARE DEVELOPER'S COMPANY, INC.,
                             ISC ACQUISITION CORP.,
                          INTERNET SECURITY CORPORATION
                                       AND
                                RICHARD KOSINSKI

                                NOVEMBER 16, 1995

         WHEREAS,   The  Software   Developer's   Company,   Inc.  ("SDC"),  ISC
Acquisition Corp. ("ISC Acquisition"), Internet Security Corporation ("ISC") and
Richard Kosinski (the "Exchanging  Stockholder")  have entered into an Agreement
and Plan of Merger dated as of October 17, 1995 (the "Merger Agreement"); and

         WHEREAS,  the  parties  to the  Merger  Agreement  desire  to amend and
supplement the agreement in certain respects as set forth herein;

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained, and intending to be legally bound, the parties hereto agree as
follows:

         Section 1.  DEFINITIONS.  Capitalized terms used herein and not defined
shall have the respective meanings set forth in the Merger Agreement.

         Section  2.  AMENDMENTS.  The  Merger  Agreement  shall be  amended  as
follows:

         (a)      The amount of authorized  capital stock of ISC  Acquisition is
                  changed from 1,000 shares to 200,000  shares and the number of
                  issued and outstanding shares of capital stock is 500 shares.

         (b)      Section 2.8 is hereby amended  and  restated  in its  entirety
                  to read as follows:

                           2.8  DIRECTORS  AND  OFFICERS.  Barry N.  Bycoff  and
                  Richard  Kosinski  shall become the directors of the Surviving
                  Corporation  at and  as of  the  Effective  Time  until  their
                  successors  shall  have been duly  elected  or  appointed  and
                  qualified  in  accordance  with  the  Surviving  Corporation's
                  Articles of Organization and Bylaws.  Richard Kosinski,  Barry
                  N.  Bycoff  and  John  M.  Hession  shall  become   President,
                  Treasurer   and   Clerk,   respectively,   of  the   Surviving
                  Corporation  at and  as of  the  Effective  Time
  
<PAGE>

                  until their successors have been duly elected or appointed and
                  qualified  in  accordance  with  the  Surviving  Corporation's
                  Bylaws.

         (c)      The undersigned hereby agree to extend the Closing (as defined
                  in Section 3.1) and extend the Termination Date (as defined in
                  Section  3.3(b))  to a  date  which  shall  be no  later  than
                  November 30, 1995.

         (d)      Section 4.10 is hereby amended and restated in its entirety to
                  read as follows:

                           4.10  BROKERS  AND  INTERMEDIARIES.  Except  for  the
                  agreement  between  Wagner  Resources  and American  Systems &
                  Technology,  Inc. (the "ISC FINDERS") and ISC, a copy of which
                  has  been  furnished  to  SDC,  none  of the  Transferors  has
                  employed any broker,  finder, advisor or other intermediary in
                  connection   with  the   transactions   contemplated  by  this
                  Agreement  which would be entitled to a fee or  commission  in
                  connection  therewith or upon the  consummation  thereof.  The
                  Exchanging  Stockholder shall be solely responsible and liable
                  for the payment of such fees or  commissions of all brokers or
                  finders  engaged  by him and  ISC,  except  that  prior to the
                  Effective Time, ISC shall make a payment to the ISC Finders of
                  $22,500 from its working  capital to pay finders'  fees of ISC
                  and the Exchanging Stockholder.

         (e)      Section 5.3 is amended by (i) changing the number of shares of
                  Common  Stock  issued  and   outstanding   from  7,443,748  to
                  7,529,011 shares and (ii) adding the following sentence at the
                  end of the  first  sentence:  "SDC also has  reserved  331,500
                  shares  of  SDC  Common   Stock  for   issuance   pursuant  to
                  outstanding warrants."

         (f)      Section  7.16  ("Opinion  of Coopers & Lybrand") is deleted in
                  its entirety.

         (g)      Section 9.2 shall be revised to add the following subsection:

                           (c) any and all payment  obligations,  liabilities or
                  personal  guarantees which  Exchanging  Stockholder may suffer
                  under  the  Agreement  with  Check  Point   Technologies  Ltd.
                  disclosed prior to the Effective Date,  provided however,  SDC
                  shall have no  indemnification  obligation for any undisclosed
                  payment obligations,  liabilities or personal guarantees under
                  the Agreement with Check Point  Technologies  Ltd. which exist
                  as  of  the  Effective  Date;  provided,   however,  that  the
                  foregoing  provisions are subject to the Basket  Deductible as
                  set  forth  in  Section  9.10(a)  of  the  Agreement  and  the
                  limitations   on  liability   set  forth  in  9.10(b)  of  the
                  Agreement.

<PAGE>

         Section 3.  COUNTERPARTS;  EFFECTIVENESS.  This  Amendment No. 1 may be
signed in counterparts, each of which shall be an original, with the same effect
as if the  signatures  thereto  and hereto were upon the same  instrument.  This
Amendment  No. 1 shall  become  effective  when each  party  hereto  shall  have
received a counterpart hereof signed by the other parties hereto.

         Section 4.  AFFIRMATION.  Each of the  parties to the Merger  Agreement
hereby  agree that except as modified  herein,  the Merger  Agreement  is hereby
reconfirmed  as  being  in  full  force  and  effect  as a  valid,  binding  and
enforceable obligation of the parties. Each of the undersigned hereby reconfirms
each of the  representations,  warranties  and covenants set forth in the Merger
Agreement.




                  [REMAINDER OF PAGE LEFT INTENTIONALLY BLANK]



<PAGE>



         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
Amendment  to the  Agreement  and  Plan of  Merger  as of the date  first  above
written.


THE SOFTWARE DEVELOPER'S            INTERNET SECURITY
COMPANY, INC.                       CORPORATION

BY:  /s/ Barry N. Bycoff            BY:  /s/ Richard Kosinski       
   BARRY N. BYCOFF, PRESIDENT          RICHARD KOSINSKI, PRESIDENT


ISC ACQUISITION CORP.               EXCHANGING
                                    STOCKHOLDER:


BY:  /s/ Barry N. Bycoff               /s/ Richard Kosinski
   BARRY N. BYCOFF, PRESIDENT       RICHARD KOSINSKI, PERSONALLY



                                                                    Exhibit 7.03


                     EMPLOYMENT AND NONCOMPETITION AGREEMENT


         AGREEMENT  made as of this  16th day of  November,  1995,  by and among
Richard Kosinski  ("EMPLOYEE")  and The Software  Developer's  Company,  Inc., a
Delaware  corporation  with a principal  place of business at 90 Industrial Park
Road,  Hingham,  MA 02043 (the  "PARENT",  the  "COMPANY" or "SDC") and Internet
Security Corporation, a subsidiary of SDC ("ISC").

         WHEREAS,  the Company believes it to be to its advantage to ensure that
Employee renders services to the Company as hereinafter provided; and

         WHEREAS,  Employee and the Company desire to enter into an Agreement to
provide for Employee's continuing employment with the Company and any successors
in interest;

         NOW, THEREFORE,  for good and valuable  consideration,  the receipt and
sufficiency of which are hereby acknowledged, and in consideration of the mutual
covenants and obligations herein contained, the parties herein agree as follows:

         1. POSITION AND  RESPONSIBILITIES.  During the term of this  Agreement,
Employee  agrees to serve as Vice  President of SDC and as President of ISC (for
purposes of this  Agreement,  the "Company"  includes SDC and ISC) as defined in
the  Agreement  and Plan of  Merger  (the  "PLAN")  by and  among  The  Software
Developer's  Company,  Inc.,  ISC  Acquisition  Corp.,  ("MERGER  SUB") and ISC.
Employee shall at all times report to, and his activities  shall at all times be
subject to the direction and control of, the Chief Executive Officer ("CEO") and
Board of Directors (the "BOARD") of Parent.  Employee shall exercise such powers
and comply with and perform,  faithfully  and to the best of his  ability,  such
directions and duties in relation to the business and affairs of the Company and
ISC as may from time to time be vested in or  requested of him by the CEO or the
Board.  Employee  agrees  to  devote  substantially  all of his  business  time,
attention and services to the diligent,  faithful and competent discharge of his
duties for the successful operation of the Company's and ISC's business.

                  During the term  hereof,  except as  permitted by Section 7(b)
Employee  will not have any  managerial  or  operational  responsibility  in any
enterprise,  firm,  corporation,  trust or other business  entity other than the
Company and ISC.  Nothing  herein shall  prevent the ownership by Employee of an
equity  interest in any business  entity  provided that such  ownership does not
contravene the Company's conflict of interest policies as in effect from time to
time,  and  Employee  shall be entitled to serve on the board of  directors of a
corporation  that is not  competitive  with the  business  of the Company to the
extent permitted under the Company's policies in effect from time to time and to
the extent authorized by the Board of Directors of the Company.  The performance
of Employee's duties hereunder shall not require Employee to relocate to another
company  or   affiliated   facility   more  than  50  miles  from  the  Hingham,
Massachusetts facility without the Employee's consent.

                  As  soon  as  practicable  following  the  execution  of  this
Agreement,  Employee  shall become an ex officio  non-voting  participant of the
Board of Directors  of the Company and Employee  shall be entitled to attend all
meetings  of the Board of  Directors.  Prior to next  year's  annual  meeting of
stockholders  and as long as Employee is employed by the Company during the term
of this  Agreement,  Employee  shall 

<PAGE>
                                      -2-

be nominated to the Board of Directors as a regular  voting  member of the Board
of  Directors.  If elected  by the  stockholders,  Employee  shall  accept  such
position and perform his duties as a Director thereunder.

         2.  COMPENSATION:  SALARY,  BONUSES,  EQUITY  PARTICIPATION  AND  OTHER
BENEFITS.  During the term of this Agreement, the Company shall pay Employee the
following compensation, including the following salary, bonuses and other fringe
benefits:

                  (A) SALARY. In consideration of the services to be rendered by
Employee to the Company,  the Company  will pay to Employee an annual  salary of
$120,000 (Employee's "base rate") during the term of this Agreement. Such salary
shall be payable in conformity with the Company's customary payroll practices as
established or modified from time to time and subject to all  applicable  taxes.
Commencing  November 1, 1996 and the month of November in each  successive  year
thereafter  while this Agreement may be in effect,  the Chief Executive  Officer
and Employee shall in good faith review the performance by, and the compensation
to, the  Employee  for the prior  year  based on merit  similar to the review of
other  senior   executive   officers  and  the  proposed   performance  by,  and
compensation to, Employee for the then forthcoming  year. Any future  agreements
regarding salary,  bonus, equity  participation,  fringe benefits,  expenses and
other material benefits and terms of this Agreement shall be subject to approval
by the Board of Directors and agreed to by Employee.

                  (B) REIMBURSEMENT OF EXPENSES.  Employee will also be entitled
to be  reimbursed  for  business-related  travel  expenses,  including  airplane
travel,  automobile,  business  mileage  and parking  expenses,  pursuant to the
Company's expense reimbursement policies as in effect from time to time.

                  (C)   PERFORMANCE-BASED   BONUS.   During  the  term  of  this
Agreement, in addition to the amounts payable under Section 2(A) above, Employee
shall be eligible to  participate  in the ISC Bonus Plan set forth on Exhibit A.
The Employee shall not participate in the Company's  Fiscal 1996 Bonus Plan, but
may participate,  subject to review and approval by SDC's Board of Directors, in
SDC's cash bonus programs after the 1996 fiscal year.

                  (D) RELOCATION EXPENSES.  The Company shall reimburse Employee
for  the  reasonable  relocation  expenses  incurred  directly  by  Employee  in
connection with his employment by the Company, as follows:

                           (i)   Reasonable    out-of-pocket   moving   expenses
associated  with  Employee's  relocation of his residence  from Billerica to the
Hingham area including costs of moving household  furnishings,  personal effects
and insurance;

                           (ii)  All  reasonable   costs   associated  with  and
necessary to the sale of Employee's  Billerica residence and the purchase by the
Employee of a residence  in the Hingham area  including  costs  associated  with
commissions  payable to real estate  brokers in connection  with the sale of the
Sudbury  residence but not including  mortgage  points for the purchase of a new
residence.

         Employee  hereby  agrees  that all such  expenses to be  reimbursed  to
Employee  under this  subsection (D) by the Company shall be reasonable and that
Employee  use his best  efforts  to  minimize  the  costs by  obtaining  in each
instance terms which are as favorable as those which Employee would negotiate if
he were to pay such  expenses  directly  himself.  Further,  Employee  agrees to
provide suitable and accurate 

<PAGE>
                                      -3-

documentation  evidencing  such costs  incurred,  and the Company  shall provide
reimbursement within a reasonable time after the receipt of such documentation.

                  (E) OTHER BENEFITS.  Employee shall be entitled to participate
in employee health, hospitalization,  disability, group term life, vacation, and
other employee  benefit  programs on the same basis as that of other officers of
SDC. The Company will use its best efforts to arrange for  additional  term life
insurance through the Company's life insurance carrier, with premiums to be paid
at Employee's expense. Employee shall be entitled to paid vacation, personal and
sick leave in  accordance  with SDC's  policies  as in effect from time to time.
Employee  shall be entitled to a carryover of accrued but unused  vacation  from
one year to the next pursuant to SDC's policies as in effect from time to time.

         3. TERM CREDIT.  For the  purposes of SDC's  benefits  plans,  Employee
shall (to the extent permitted by any such respective  employee benefit plan and
applicable law) be deemed to have been  continuously  employed by SDC since July
1, 1994.

         4. EQUITY  PARTICIPATION.  Employee  shall be granted at the  Effective
Time (as defined below) stock options to purchase  75,000 shares of Common Stock
of SDC. The exercise price for such option shall be the fair market value of the
such Common Stock as of the date of such grant.  Such options shall be incentive
stock options to the maximum extent permitted under applicable law. Such options
shall become  exercisable  as to 30% upon the first  anniversary  of the date of
grant,  and the balance shall vest at the rate 20% on each of the second,  third
and fourth  anniversaries  of grant date,  and the  remaining 10% vesting on the
fifth  anniversary of the date of grant,  subject to any acceleration of vesting
as may be applicable  pursuant to Section 5 below.  Employee  shall have 90 days
from  termination  of  employment  to  exercise  any vested  options;  provided,
however,  that in the event of  termination  of  employment  because of death or
disability  of Employee,  Employee or his estate or legal  representative  shall
have up to 12 months (but in no event  longer  than the full term of  Employee's
options  as  set  forth  in  Employee's  option  agreement)  from  the  date  of
termination of employment to exercise such option shares.  Any options which are
granted  shall be subject to an  incentive  stock  option  agreement in the form
normally used by SDC with respect to its employees and in all respects  shall be
governed by the terms of SDC's stock option plan.

         5. TERM.

         5.1  GENERAL.  The  term of this  Agreement  shall  commence  and  this
Agreement shall be effective upon the Effective Time (as that term is defined in
the Plan (the "EFFECTIVE  TIME")) and shall terminate on the earlier to occur of
(i) the three year  anniversary of the Effective Time,  (ii)  Employee's  death,
(iii) a determination  that Employee has become disabled,  as defined in Section
5.3,  (iv)  termination  "for cause"  under the  provisions  of Section 5.6, (v)
termination without cause as provided in Section 5.7, (vi) voluntary termination
by  Employee as provided  in Section  5.5 or (vii)  termination  for  inadequate
performance as provided in Section 5.8. The term "EMPLOYMENT  PERIOD" shall mean
the initial period of Employee's  employment  with the Company  hereunder.  This
Agreement will  automatically  renew for an additional  twelve (12) months after
termination  under  subsection  (i),  unless the Company gives  Employee six (6)
months prior written notice of the Company's decision not to renew the Agreement
for an additional twelve (12) months.

         5.2  TERMINATION AT END OF TERM.  Upon  termination of the Agreement at
the end of its term, Employee shall be entitled to (i) accrued and unpaid salary
and vacation  through the  termination  date,  (ii) COBRA  benefits for up to 18
months,  provided Employee makes the appropriate conversion and payments,  

<PAGE>
                                      -4-

(iii) the pro rata portion of any bonus that Employee had otherwise earned under
the terms of the ISC Bonus Plan as of the termination  date, and (iv) no further
severance or other compensation benefits.

         5.3  TERMINATION  UPON  DISABILITY.   Employee  shall  be  regarded  as
"disabled" for the purpose of this Agreement if he has been unable to render the
services  required of him hereunder,  in a manner consistent with past practice,
for a period of two (2) consecutive  months,  or for any period in the aggregate
of four (4) months in any twelve-month  period,  because of a continuing  health
impairment,   which  impairment  will  likely  result  in  Employee's  continued
inability  to  render  the  services  required  of  him  hereunder  in a  manner
consistent with past practices;  provided, however, that thirty (30) days' prior
notice  of  termination  for  disability  shall  be  given  to  Employee.   Upon
termination for disability, Employee shall be entitled to (i) accrued and unpaid
salary and vacation through the termination  date, (ii) COBRA benefits for up to
18 months, provided Employee make the appropriate conversion and payments, (iii)
any  payments  available to Employee  under any  disability  insurance  programs
maintained  by the Company  providing  for payment of  disability  insurance  to
Employee,  (iv) the pro rata portion of any bonus that Employee had earned under
the terms of the ISC Bonus Plan as of the termination  date, (v) an amount equal
to the difference  between (a) the payments made under clause (iii) above,  plus
any governmental  benefits (such as Social Security) and (b) Employee's  current
annual  base  salary,  and  (vi) no  further  severance  or  other  compensation
benefits.  Payments  under clause (v) shall  continue for so long as Employee is
disabled but in no event for greater  than twelve (12) months after  termination
upon disability.

         In the event that there should be any dispute between  Employee and the
Company  as to  whether  Employee  is  "disabled"  within  the  meaning  of this
Agreement or as to whether Employee has recovered from any such disability, such
matter shall be  conclusively  determined  by the written  report of a physician
acceptable  to the Company and  Employee,  who shall set forth in his report the
nature and  seriousness  of the  impairment  suffered by Employee and the likely
effect of such  impairment on Employee's  future  ability to render the services
requested hereunder.  Employee agrees to submit to all necessary examinations by
any such  physician  to the extent  reasonably  required  by the Company for the
purpose of ascertaining the extent of Employee's disability or the likelihood of
recovery.  The parties agree that any  determination  with respect to Employee's
disability may be  conclusively  resolved in the sole judgment of the Company if
Employee  should  fail to comply with any  reasonable  request by the Company to
submit to an examination.

         5.4  TERMINATION  UPON DEATH.  If Employee  dies during the  Employment
Period, the Agreement shall terminate upon such death and Employee or his estate
shall be  entitled to (i) accrued  and unpaid  salary and  vacation  through the
termination  date, (ii) any insurance  proceeds  available to Employee's  estate
under any life  insurance  programs  maintained  by the  Company  providing  for
payment of such benefits to Employee's estate, (iii) the pro rata portion of any
bonus that  Employee  had earned under the terms of the ISC Bonus Plan as of the
termination  date,  and  (iv) no  further  severance  or other  compensation  or
benefits.

         5.5 VOLUNTARY TERMINATION. Employee may terminate this Agreement at any
time upon thirty (30) days prior  written  notice to the Company and ISC. In the
event of any such  termination,  Employee  shall be  entitled to (i) accrued and
unpaid salary and vacation through the termination date, (ii) COBRA benefits for
up  to 18  months,  provided  Employee  makes  the  appropriate  conversion  and
payments, and (iii) no further severance or other compensation benefits.

         5.6  TERMINATION  FOR CAUSE.  The Company may terminate the  Employment
Period and  discharge  Employee for cause  immediately  upon  written  notice to
Employee of such  termination.  

<PAGE>
                                      -5-

Regardless  of any broader  definition of "cause"  which might  otherwise  apply
under  applicable  law,  the term "for cause" as used herein shall be defined to
include only one or more of the following grounds involving the Company,  ISC or
any subsidiary: (a) Employee's willful refusal to perform reasonable assignments
given to  Employee  commensurate  with such  Employee's  status,  functions  and
responsibilities as set forth above, provided,  that (i) such refusal has caused
the Company  material harm and is  repetitive  and not due to illness or injury,
and (ii) Employee  shall have been given  reasonable  notice and  explanation of
each  refusal,  and  reasonable  opportunity  for a period of  thirty  (30) days
following  notice,  to cure such refusal,  and no cure has been effected  within
such  time;  (b)  gross  negligence  of the  Employee  in  connection  with  the
performance  of such  duties;  (c) the  conviction  of the Employee of a felony,
either in connection  with the  performance of his obligations to the Company or
which shall adversely affect the Employee's ability to perform such obligations;
(d) determination by a court of final jurisdiction that Employee has committed a
breach of  fiduciary  duty to the Company  that has caused the Company  material
harm; (e) the material abuse of any drug or medication which affects performance
for a period of 60 days  following  notice of such abuse and an  opportunity  to
cure;  or (f) a  breach  of any of the  provisions  of  Sections  6 and 7 hereof
involving  the  Employee's  covenants on  non-competition,  confidentiality  and
assignment of inventions. In making any determination under this Subsection, the
CEO shall act fairly and in utmost good faith.  If the  Employee  disputes  this
determination, the Employee shall have a non-exclusive opportunity to appear and
be heard at a meeting  of the Board of  Directors  or any  committee  thereof to
review the determination.

         In the event of any termination  for cause,  Employee shall be entitled
to: (i) accrued and unpaid  salary and vacation  through the  termination  date;
(ii) COBRA benefits for up to 18 months provided  Employee makes the appropriate
conversion and payments, and (iii) no further severance or other compensation or
benefits.  For the purposes of this Section 5.6, the Company includes itself and
any subsidiary.

         5.7 AT THE  ELECTION OF THE  COMPANY FOR REASONS  OTHER THAN FOR CAUSE.
The Company may terminate Employee's employment hereunder at any time during the
term of this Agreement without cause upon thirty (30) days' prior written notice
to Employee.  In the event the Company exercises its right to terminate Employee
under this  Section  5.7,  Employee  shall be entitled to (i) twelve (12) months
base salary at the then current  rate,  (ii) medical and other health  insurance
benefits at the then current levels for a period of twelve months after the date
of such  termination,  (iii) COBRA  benefits for up to an additional  six months
after the expiration of the twelve-month  period in clause (ii) above,  provided
Employee  makes the  appropriate  conversion  and payments,  (iv) the bonus that
Employee would have otherwise earned or accrued under the terms of the ISC Bonus
Plan  for the  full  fiscal  year  in  which  Employee  is  terminated,  (v) the
acceleration  of vesting of all stock  options  previously  granted to  Employee
under the ISC Bonus Plan  granted  prior to the  termination  date,  and (vi) no
other severance or other  compensation  or benefits.  Any such payments shall be
payable in equal installments over the term of the severance period.

         It shall be deemed to be a  termination  "without  cause" if Employee's
responsibilities  and executive authority are reduced or diluted in any material
respect without Employee's consent (which reduction or dilution is not corrected
by the  Company  within  thirty  (30) days  following  written  notification  by
Employee to the Company that Employee  intends to terminate his  employment  for
such reason), or Employee is relocated to another Company facility or affiliated
facility  more  than  fifty  (50)  miles  from  Hingham,  Massachusetts  without
Employee's consent.

         5.8 TERMINATION FOR INADEQUATE  PERFORMANCE.  The Company may terminate
Employee's employment hereunder for inadequate performance.  Performance will be
evaluated at the end of each fiscal  

<PAGE>
                                      -6-

quarter starting with the quarter ending September 30, 1996. Performance will be
deemed  inadequate  if Pre-Tax  Income of ISC,  as defined in Exhibit A, for the
quarter is below seventy  percent (70%) of the actual  quarterly  Pre-Tax Income
forecast  number for ISC's business for such quarter  through the quarter ending
March 31,  1998.  In the  event the  Company  exercises  its right to  terminate
Employee  under this  Section  5.8,  Employee  shall be  entitled to (i) six (6)
months base  salary at the then  current  rate,  (ii)  medical and other  health
insurance  benefits  at the then  current  levels for a period of six (6) months
after the date of such termination, (iii) COBRA benefits for up to an additional
twelve (12) months after the expiration of the six-month  period in clause (ii),
provided  Employee makes the  appropriate  conversion and payments,  and (iv) no
other severance or other  compensation  or benefits.  Any such payments shall be
payable in equal installments over the term of the severance period.

         5.9 WITHHOLDING.  All salary, bonus and other compensation of Employee,
and all severance and other compensation and benefits upon termination, shall be
subject to applicable federal, state and other withholding taxes.

         6.   CONFIDENTIALITY  AND  ASSIGNMENT  OF  INVENTIONS   AGREEMENT.   In
connection with his  commencement  of employment by the Company  pursuant to the
terms of this Agreement, Employee shall execute, simultaneous with the execution
of this Agreement by the Company,  a form of  Confidentiality  and Assignment of
Inventions Agreement used by the Company for its employees.

         7. NON-COMPETITION.

                  (a) The parties  understand  and agree that this  Agreement is
entered in connection with the Merger as a material inducement to the Parent and
Merger Sub to enter into the acquisition of ISC. The parties further  understand
and agree that Employee was the sole stockholder and Chief Executive  Officer of
ISC. As a result of the foregoing,  the parties  expressly  understand and agree
that the non-competition  provisions contained in this Agreement are reasonable,
permissible and enforceable pursuant to the provisions of applicable law.

                  (b) Commencing at the Effective Time and continuing  until the
later of (i) four years from the date  hereof or (ii)  twelve  months  following
termination of Employee's  employment hereunder,  for any reason,  Employee will
not,  as  an  employee,  agent,  consultant,  advisor,  independent  contractor,
partner, officer, director,  stockholder,  lender or guarantor of any entity, or
in any other capacity, directly or indirectly:

                           i)  participate  or  engage in a  business  where the
Employee is involved in activities relating to the distribution, marketing, sale
or servicing of any authentication, encryption or "firewall" product or services
for the InterNet or other on-line services or computer networks (the "BUSINESS")
in any states where ISC is presently offering such products or services or those
states in which ISC or the Company is offering  products or services relating to
the  Business  at the time of any  termination  of  employment;  (ii)  induce or
attempt to induce any person who at the time of such  inducement  is an employee
or  consultant  of the Company or ISC to perform  work or services for any other
person or  entity  other  than the  Company  or ISC;  (iii)  permit  the name of
Employee to be used in connection with a competitive  Business;  or (iv) solicit
or entice any customer or prospective customer of ISC or the Company at the time
of  termination  of  employment  in order to offer  products  or  services  of a
competitive Business.

<PAGE>
                                      -7-

                  (c) The parties understand and agree that the  non-competition
agreement set forth in this Section 7 shall be construed as a series of separate
covenants not to compete: one covenant for each state within the Territory,  one
for each  separate  line of business  of the  Company and ISC,  and one for each
month  of the  non-competition  period.  If any  restriction  set  forth in this
Section  7 is held by a court  or  arbitration  panel to be  unenforceable  with
respect to one or more  geographic  areas,  lines of business  and/or  months of
duration,  then ISC,  the Company  Employee  agree,  and hereby  submit,  to the
reduction and limitation of such  restriction to the minimal effect necessary so
that the provisions of this Section 7 shall be enforceable to the maximum extent
possible.

         8.  NO  CONFLICTS.  Employee  represents  that he is not  bound  by any
agreement  or  any  other  existing  or  previous  business  relationship  which
conflicts  with,  or may  conflict  with,  the  performance  of his  obligations
hereunder or prevent the performance of his duties and obligations hereunder.

         9. GOVERNING LAW. This Agreement  shall be governed by and construed in
accordance with the internal laws of the Commonwealth of Massachusetts  and this
Agreement shall be deemed to be performable in Massachusetts.

         10. SEVERABILITY. Without in any way limiting the provisions of Section
7(c), in case any one or more of the  provisions  contained in this Agreement or
the other agreements  executed in connection with the transactions  contemplated
hereby for any reason shall be held to be invalid,  illegal or  unenforceable in
any respect,  such invalidity,  illegality or unenforceability  shall not affect
any  other  provision  of this  Agreement  or such  other  agreements,  but this
Agreement or such other  agreements,  as the case may be, shall be construed and
reformed to the maximum extent permitted by law.

         11. WAIVERS AND MODIFICATIONS.  This Agreement may be modified, and the
rights, remedies and obligations contained in any provision hereof may be waived
only in accordance with this Section 11. No waiver by either party or any breach
by the other or any provision hereof shall be deemed to be a waiver of any later
or other breach thereof or as a waiver of any other provision of this Agreement.
This Agreement may not be waived, changed, discharged or terminated orally or by
any course of dealing between the parties,  but only by an instrument in writing
signed by the party against whom any waiver, change, discharge or termination is
sought.  No modification or waiver by the Company shall be effective without the
consent of at least a majority of the members of the Board of Directors  then in
office at the time of such modification or waiver.

         12. ASSIGNMENT.  Employee acknowledges that the services to be rendered
by him  hereunder are unique and personal in nature.  Accordingly,  Employee may
not assign any of his rights or delegate any of his duties or obligations  under
this  Agreement.  The rights and  obligations  of the Company and ISC under this
Agreement  shall  inure to the  benefit  of,  and shall be binding  upon,  their
successors and assigns.

         13.   ACKNOWLEDGMENTS.   Employee   recognizes   and  agrees  that  the
enforcement of the  noncompetition  provisions of this Agreement is necessary to
ensure the  preservation,  protection  and  continuity  of the  business,  trade
secrets and goodwill of the Company.

         14. ENTIRE  AGREEMENT.  This Agreement and the exhibits  constitute the
entire  understanding  of the parties  relating to the subject matter hereof and
supersedes and cancels all  agreements,  written or oral, made prior to the date
hereof between Employee and the Company relating to employment,  salary,  bonus,
or  other  compensation  of any  description,  equity  participation,  benefits,
severance or other remuneration.

<PAGE>
                                      -8-
   
         15.  NOTICES.  All notices  hereunder  shall be in writing and shall be
delivered in person or mailed by overnight courier service, electronic facsimile
transmission, or first class mail (postage prepaid).

         16.  COUNTERPARTS.  This  Agreement  may be  executed  in  two or  more
counterparts,  each of which shall be deemed to be an original, but all of which
together shall constitute one and the same instrument.

         IN WITNESS  WHEREOF,  the parties hereto have executed this  Employment
Agreement as of the date first above written as an instrument under seal.

THE SOFTWARE DEVELOPER'S COMPANY, INC.         RICHARD KOSINSKI

By:     /s/ Barry N. Bycoff                      /s/ Richard Kosinski
                                               Signature, Richard Kosinski

Title:  President, Chief Executive Officer


INTERNET SECURITY CORPORATION

By:   /s/ Barry N. Bycoff

Title:  Treasurer

<PAGE>
                                      -9-

Exhibit A

ISC Bonus Plan:

The ISC Bonus Plan offers the  Employee  two  different  Options  from which the
Employee may choose one or the other for a given  fiscal  year,  except as noted
below for Option 2 for the 1996 fiscal year. Option 1 is available for the 1996,
1997 and 1998 fiscal  years.  Option 2 will not be available for the 1996 fiscal
year but will be available for the 1997 and 1998 fiscal years.

The award date for the  determination  of the Bonus Plan will be  established as
soon as possible  after the date the audit is complete,  and the award of a cash
bonus or stock  options will be made as early as possible  prior to the date the
financial  statements  are made  available to the public for each given year. On
the award date, Employee must choose either Option 1 or Option 2.

Both Options 1 and 2 are based on the financial performance of ISC, based on the
achievement of actual  Revenues and Pre-Tax Income of ISC.  Without  limitation,
the ISC business will include all Internet and network-related security products
and services.  Revenue and Pre-Tax  Income derived from the sale of products and
services of the ISC business  made through SDC or its other  subsidiaries  (such
as, for example,  sales of ISC security  products made through  SDC's  catalogs)
will be included in  calculating  the financial  performance  of ISC.  Financial
performance is measured by comparing  ISC's actual Revenue and Pre-Tax Income to
ISC's Base Plan forecasts.  The actual Revenue and Pre-Tax Income of ISC will be
calculated  in  accordance  with GAAP. A proper  allocation of the cost of SDC's
facilities,   overhead  and  other  sales,   marketing  and  other  general  and
administrative  expenses  incurred by SDC with respect to ISC's business will be
included as a deduction in arriving at ISC's actual Pre-Tax Income (for example,
such as SDC's  contribution to ISC of resources and funds for telephone,  legal,
finance,  advertising,  depreciation,  consulting  services,  seminars and trade
shows, supplies). ISC will receive a pro-rata G&A allocation based on the number
of employees  working under ISC accounts divided by the total number of domestic
employees  working  at SDC  (including  ISC  employees),  not to  exceed  10% of
revenue. This Bonus Plan only covers the 1996, 1997 and 1998 fiscal years.

The Base Plan forecast numbers for ISC's business are as follows:

<TABLE>
<CAPTION>

                                                                      ISC                 ISC
                                                                    Base Plan           Base Plan
                                                                     Revenue         Pre-Tax Income

<S>                                                               <C>                 <C>     
Fiscal Year 1996 (October 1, 1995 to March 31, 1996)               $3,007,000           $438,000

Fiscal Year 1997 (March 31, 1997)                                  $8,230,000           $872,000

Fiscal Year 1998 (March 31, 1998)                                 $14,243,000         $2,299,000
</TABLE>

OPTION 1 - STOCK OPTIONS

         Option 1 awards  incentive  stock options for SDC's Common Stock for up
to 100,000  shares in each fiscal year for the  three-year  term  covered by the
Agreement.  The first year's award of stock  options will be pro-rated  over the
remaining  months of SDC's 1996  fiscal  year which  ends  March 31,  1996.  For

<PAGE>
                                      -10-

example, if the closing date for SDC's acquisition of ISC is September 30, 1995,
six months (or 50,000 stock options,  50% of the 100,000 award potential for the
remaining six months of the 1996 fiscal year) would be available to the Employee
if ISC  achieves  the Base  Plan  Revenue  and Base  Plan  Pre-Tax  Income.  The
remaining  two  fiscal  years  (1997 and 1998)  would  offer  the  potential  of
incentive stock options for SDC's Common Stock for up to 100,000 shares for each
fiscal  year  (1997 and 1998).  The  exercise  price of the stock  options to be
awarded  under this plan will be the market value on the date of the award.  The
stock  options which may be awarded in any fiscal year under this Plan will vest
in equal,  annual  installments  over a four-year  period  following the date of
award at 25% at the end of each  year  following  the first  anniversary  of the
award.

         The  potential  award of stock  options to Employee  under  Option 1 is
based on the financial  performance  of the  achievement  of Revenue and Pre-Tax
Income  thresholds for ISC's business.  Employee must achieve both his Base Plan
Revenue  and Base Plan  Pre-Tax  Income  forecast  of ISC's  business  to become
eligible for the bonus award each year. If ISC's actual Pre-Tax Income equals or
exceeds 125% of ISC's Base Plan  Pre-Tax  Income set forth above all the options
for 100,000  shares of SDC's  Common Stock  available  for each fiscal year (pro
rated, however, for the 1996 fiscal year) shall be awarded to Employee. If ISC's
actual Pre-Tax Income is greater than 100% of ISC's Base Plan Pre-Tax Income but
less  than 125% of ISC's  Base  Plan  Pre-Tax  Income,  the  number of SDC stock
options  awarded  shall be calculated  on a straight  line  interpolation  basis
(rounded up or down to the nearest whole share).

         The  following  is an  example  of how  Option 1 works:  If in the 1997
fiscal year ISC's  actual  Revenues  equals or exceeds the Base Plan  Revenue of
$8,230,000  and ISC records  $1,002,800  actual Pre-Tax Income (which is 115% of
the 1997 fiscal year Base Plan Pre-Tax Income  threshold of $872,000),  Employee
would be awarded 60% (or 15/25's) of the stock option pool for 100,000 shares of
SDC's  Common Stock  otherwise  available to be awarded.  Thus,  Employee  would
receive  60,000  stock  options for fiscal  1997.  If ISC records in fiscal year
ending March 31, 1997,  Revenues  equal to or in excess of the Base Plan Revenue
of $8,230,000  and has achieved an actual  Pre-Tax  Income of $1,100,000  (which
exceeds  125% of ISC's  Base Plan  Pre-Tax  Income  for the 1997  fiscal  year),
Employee  would be awarded 100% of the stock  option pool for 100,000  shares of
SDC's Common  Stock.  Thus,  Employee  would  receive  stock options for 100,000
shares of SDC's Common Stock for SDC's 1997 fiscal year.

         If  employment  is  terminated  without  cause  during  the term of the
Agreement,  all  previously  awarded stock options under this ISC Bonus Plan for
performance in completed fiscal years will accelerate and vest  immediately.  If
employment  is  terminated  without  cause by SDC pursuant to Section 5.7 of the
Agreement, the annual award will be the bonus that Employee would have otherwise
earned or accrued  under the terms of the ISC Bonus Plan for the fiscal  year in
which Employee is terminated.

OPTION 2 - CASH

         Option  2  allows  the  Employee  to earn  only a cash  bonus  based on
achieving  certain  minimum levels of financial  performance as measured both by
ISC's Base Plan  Pre-Tax  Income and by ISC's Base Plan Revenue set forth above.
The cash award is based on a  progressive  bonus  system.  There are three Bonus
brackets  based on the actual  Pre-Tax  Income of ISC as  compared  to Base Plan
Pre-Tax  Income of ISC for each fiscal year. The amount of actual Pre-Tax Income
of ISC in each bracket is  multiplied  by a Bonus Factor and then  multiplied by
the ratio, rounded to two decimal points, of actual Revenue to Base Plan Revenue
of ISC. Each year ISC must achieve a minimum of 80% of Base Plan Pre-Tax  Income
and 70% of Base  

<PAGE>
                                      -11-

Plan Revenue  (ratio of actual  Revenue to Base Plan Revenue  equaling 0.70) for
Employee  to become  eligible  for Option 2. The maximum for the ratio of actual
Revenue to Base Plan  Revenue will always be 1.00 (i.e.  ISC's  actual  Revenues
meeting or exceeding Base Plan Revenues). The maximum actual Pre-Tax Income used
in the  calculations  will  be  150%  of Base  Plan  Pre-Tax  Income  forecasts.
Therefore,  excess actual  Pre-Tax  Income of ISC over 150% of Base Plan Pre-Tax
Income will not contribute to the Bonus payout. The formula is as follows:

<TABLE>
<CAPTION>


                                                                Ratio of Actual Revenue to
                                                                     Base Plan Revenue
Actual Pre-Tax Income            X       Bonus Factor       X                                 =       Bonus Payout
- ---------------------                    ------------                                                 ------------
                                                                   (need minimum 0.70;
                                                                   -------------------
                                                                       maximum 1.00)

<S>                                          <C> 
Up to 100% of Plan Dollars                   0.10
(need minimum of 80%)

Greater than 100% to 125% of                 0.20
Plan Dollars

Greater than 125% to 150% of                 0.30
Plan Dollars
</TABLE>

         The following is an example using the 1997 fiscal year,  assuming ISC's
actual  Pre-Tax  Income of $959,200 on actual  Revenue of  $8,641,500  for ISC's
business.  Thus,  actual  Pre-Tax  Income for ISC's business is equal to 110% of
forecasted  Base Plan Pre-Tax  Income of $872,000  (the third bonus bracket does
not apply) and actual  Revenue for ISC's business is equal to 105% of forecasted
Base Plan Revenue of $8,230,000  (the maximum ratio of 1.00 would be used).  The
Bonus calculation would be as follows:

<TABLE>
<CAPTION>


                                                                       Ratio of Actual Revenue
Actual Pre-Tax Income                             Bonus Factor           to Base Plan Revenue
                                            X                      X                             X     Bonus Payout
                                                                         (need minimum 0.70;
                                                                            maximum 1.00)

<S>                                                   <C>                        <C>                   <C>    
$872,000                                              0.10                       1.00                   $87,200
(Pre-Tax Income - up to 100% of Plan --
                  -----
need minimum of 80%)

<PAGE>
                                      -12-

$87,200                                               0.20                       1.00                   $17,440
(Pre-Tax Income - greater than 100% to
125% of Base Plan)

- -0-                                                   0.30                       1.00
(Pre-Tax Income - greater than 125% to                                                                    -0-
                                                                                                          ---
150% of Base Plan)

TOTAL CASH BONUS PAYMENT TO BE AWARDED
FOR 1997 FISCAL YEAR EQUALS:                                                                           $104,640
</TABLE>

         The following is an example using the 1997 fiscal year,  assuming ISC's
actual  Pre-Tax  Income of $1,395,200 on actual  Revenue of $6,830,900 for ISC's
business.  Thus,  actual  Pre-Tax  Income for ISC's business is equal to 160% of
forecasted  Base Plan Pre-Tax  Income of $872,000 and actual  Revenues for ISC's
business is equal to 83% of  forecasted  Base Plan  Revenue of  $8,230,000.  The
Bonus calculation is as follows:

<TABLE>
<CAPTION>



Actual Pre-Tax Income                       X     Bonus Factor     X   Ratio of Actual Revenue   X     Bonus Payout
- ---------------------                             ------------                                         ------------
                                                                         to Base Plan Revenue
                                                                         (need minimum 0.70;
                                                                            maximum 1.00)

<S>                                                   <C>                        <C>                    <C>    
$872,000                                              0.10                       0.83                    $72,376
(Pre-Tax Income - up to 100% of Plan --
                  -----
need minimum of 80%)

$218,000                                              0.20                       0.83                    $36,188
(Pre-Tax Income - greater than 100% to
125% of Base Plan)

$218,000                                              0.30                       0.83                    $54,282
                                                                                                         -------
(Pre-Tax Income - greater than 125% to
150% of Base Plan)

TOTAL CASH BONUS PAYMENT TO BE AWARDED                                                                  $162,846
FOR 1997 FISCAL YEAR EQUALS:
</TABLE>

 
                                                                    Exhibit 7.04



                               HOLDBACK AGREEMENT


         This  Holdback  Agreement  (this  "Agreement")  is  entered  into as of
November 16, 1995 by and among The Software Developer's Company Inc., a Delaware
corporation   ("SDC"),   and  the  former   shareholder  of  Internet   Security
Corporation,  a Massachusetts corporation ("ISC"), Richard Kosinski ("Exchanging
Stockholder").

                                    RECITALS

         A. SDC, ISC Acquisition  Corp., a Massachusetts  corporation and wholly
owned subsidiary of SDC ("ISC Acquisition"),  ISC and the Exchanging Stockholder
are parties to an Agreement and Plan of Merger (the "Merger Agreement") pursuant
to which SDC will acquire ISC through a merger of ISC Acquisition  with and into
ISC (the  "Merger") in which shares of SDC's  common  stock,  $.01 par value per
share  ("Common  Stock"),  will be issued to the  Exchanging  Stockholder as set
forth in the Merger Agreement.

         B. To induce SDC to effect the Merger,  the Exchanging  Stockholder has
agreed  that  certain  shares of Common  Stock  issued to him in the Merger will
pledged  to and held by SDC in order to  provide a partial  source of payment of
the  Exchanging  Stockholder's  indemnification  obligations  under  the  Merger
Agreement.

                                    AGREEMENT

         In consideration of the foregoing premises and the mutual and dependent
promises hereinafter set forth, the parties agree as follows:

1.       HOLDBACK

         The  46,583  shares  of Common  Stock to be  issued  to the  Exchanging
Stockholder  under Section  2.4(b) of the Merger  Agreement  (together  with any
distributions accrued or made thereon and any other securities or property which
may be issued in exchange for such shares in any merger or  recapitalization  or
similar transaction  involving SDC, the "Holdback Shares") are hereby pledged by
the  Exchanging  Stockholder  to,  and shall be held by,  SDC  pursuant  to this
Agreement.  The  Exchanging  Stockholder  shall  deliver to SDC at the time this
Agreement is executed and delivered  appropriate  stock powers endorsed in blank
and such other  documentation  as SDC may prescribe to carry out the purposes of
this Agreement.  So long as any Holdback  Shares are held by SDC hereunder,  SDC
shall have, and the Exchanging Stockholder hereby grant, as of and from the date
of  this  Agreement,  a  perfected,  first-priority  security  interest  in such
Holdback  Shares  to  secure  payment  of  amounts  payable  by  the  Exchanging
Stockholder in respect of  indemnification  claims under Article 9 of the Merger

<PAGE>
                                      -2-

Agreement.  In connection therewith,  Exchanging Stockholder expressly agrees to
execute and deliver  such  instruments  as SDC may from time to time  reasonably
request for the purposes of evidencing and perfecting such security interest.

2.       ENTIRE AGREEMENT

         This Agreement, together with the Merger Agreement, contains the entire
understanding   and  agreement  of  the  parties  hereto  with  respect  to  the
transactions  contemplated  hereby and supersedes and may not be supplemented or
varied by any prior oral or written  understandings or agreements.  The headings
in this  Agreement are inserted for  convenience of reference only and shall not
be a part of or control or affect the meaning hereof.

3.       TAXATION OF INTEREST EARNED ON INVESTMENTS OF HOLDBACK DEPOSIT

         Exchanging  Stockholder hereby acknowledges that, for federal and state
income tax purposes,  any dividends or other  distributions  with respect to the
Holdback Shares shall be income of the Sellers.

4.       AMENDMENT AND WAIVER

         This Agreement may be amended,  modified,  supplemented or altered only
by a writing  duly  executed by SDC and  Exchanging  Stockholder.  No failure or
delay by a party hereto in exercising  any right,  power or privilege  hereunder
shall operate as a waiver  thereof,  and no single or partial  exercise  thereof
shall preclude any right of further exercise or the exercise of any other right,
power or privilege.  No waiver of any rights, power or privilege hereunder shall
be effective unless set forth in writing, executed by the party against whom the
waiver is sought to be enforced.

5.       SEVERABILITY

         If any term or other provision of this Agreement is invalid, illegal or
incapable  of being  enforced  by any rule of law, or public  policy,  all other
conditions and provisions of this Agreement  shall  nevertheless  remain in full
force and effect so long as the economic or legal substance of the  transactions
contemplated  hereby is not  affected in any manner  adverse to any party.  Upon
such  determination  that any term or other  provision  is  invalid,  illegal or
incapable of being enforced, the parties hereto shall negotiate in good faith to
modify  this  Agreement  so as to effect the  original  intent of the parties as
closely  as  possible  in  a  mutually  acceptable  manner  in  order  that  the
transactions  contemplated  hereby be consummated as originally  contemplated to
the fullest extent possible.

6.       GOVERNING LAW

         This  Agreement  shall be governed  by and  construed  and  enforced in
accordance  with the laws of the  Commonwealth of  Massachusetts,  as applied to
contracts executed and to be fully performed in such State.

<PAGE>
                                      -3-

7.       COUNTERPARTS

         This Agreement may be executed by the parties hereto individually or in
any combination, in one or more counterparts, each of which shall be an original
and all of which shall together constitute one and the same agreement.

         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
of the date first above written.


THE SOFTWARE DEVELOPER'S                    INTERNET SECURITY
COMPANY, INC.                               CORPORATION

BY:  /s/ Barry N. Bycoff                    BY:  /s/ Richard Kosinski     
   BARRY N. BYCOFF, PRESIDENT                  RICHARD KOSINSKI, PRESIDENT


ISC ACQUISITION CORP.                       EXCHANGING STOCKHOLDER:

By:  /s/ Barry N. Bycoff                      /s/ Richard Kosinski           
   BARRY N. BYCOFF, PRESIDENT               RICHARD KOSINSKI, PERSONALLY



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