INTERLINK COMPUTER SCIENCES INC
8-K, 1997-10-03
COMPUTER INTEGRATED SYSTEMS DESIGN
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT


                               September 18, 1997
                               ------------------
                Date of Report (Date of earliest event reported)

                        Interlink Computer Sciences, Inc.
                        ---------------------------------
             (Exact name of Registrant as specified in its charter)

                                    Delaware
                  --------------------------------------------
                 (State or other jurisdiction of incorporation)

      000-21077                                          94-2990567
 -------------------                                 -------------------
(Commission File No.)                       (IRS Employer Identification Number)


                            47370 Fremont Boulevard,
                            Fremont, California 94538
                                 (510) 657-9800
                     --------------------------------------
                    (Address of Principal Executive Offices)

                                 Not Applicable
                     --------------------------------------
          (Former name or former address, if changed since last report)

<PAGE>

Item 2.           Acquisition or Disposition of Assets

         On  September  18,  1997  (the  "Closing  Date"),   Interlink  Computer
Sciences,   Inc.,  a  Delaware   Corporation  (the  "Company"),   completed  its
acquisition  of  the  NetLOCK   technology  (the  "Product  Line")  from  Hughes
Electronics  Corporation ("Hughes") pursuant to an Asset Purchase Agreement (the
"Agreement") dated September 17, 1997 by and between the Company and Hughes. The
consideration  paid by the Company to Hughes for the Product  Line  consisted of
$1,000,000 plus $1,143,822 for all of the equipment  Hughes used  exclusively or
primarily in the operation of the Product Line. Under the Agreement, the Company
also agreed to pay Hughes a royalty on revenues  derived from the Product  Line,
net of revenues from  consulting or other  services  rendered in installing  and
implementing  the  Product  Line at client  sites and net of refunds and certain
other  items.  The  royalty  obligation  will  continue  for five years from the
Closing Date and is limited to a cumulative maximum payment.

         The Company will also pay royalties to Mentat  Inc. ("Mentat")  and RSA
Data  Security,  Inc.  ("RSA") in connection  with the revenue  derived from the
Product  Line.  Pursuant  to a Software  License  Agreement  by and  between the
Company and Mentat  dated  September  17,  1997 (the  "Mentat  Agreement"),  the
Company  has agreed to pay Mentat  royalties  on Net  Revenues  (as that term is
defined in the Mentat  Agreement)  derived  from the Product Line to be adjusted
after  four years and again  after six years.  The  Company  has also  agreed to
certain minimum royalty payments through the first five (5) years of the license
term.  Pursuant to an OEM  Software  License  Agreement  which the Company  will
assume with RSA Data Security,  Inc. (the "RSA  Agreement") the Company will pay
RSA a royalty of the Net Sale  Price on a Bundled  Product  (as those  terms are
defined in the RSA Agreement) for as long as the Company licenses  software from
RSA.

         The NetLOCK  acquisition  will be accounted  for as a purchase.  At the
date of  acquisition,  the  NetLOCK  technology  had not  reached  technological
feasibility nor did it have any alternative future use. Accordingly, the Company
believes a substantial  portion of the purchase price and the guaranteed minimum
royalty  amounts will be charged to purchased  research and  development  in the
first quarter of fiscal year 1998.

         The NetLOCK technology is a class of security solutions being developed
for enterprise-wide,  end-to-end  protection of confidential  information on the
network.  The Company  purchased  the NetLOCK  Product  Line because the Company
desires to enable  businesses to extend their networks to more users over a wide
variety of LAN and WAN technologies and public data network services.

         The  NetLOCK  development  team,  which  consists  of  twenty-one  (21)
engineers will operate out of Brea,  California and Barbara Booth, the Company's
Vice President of Research and Development,  will relocate to Brea to manage the
NetLOCK  operation.  In September  1997,  the Company  entered into an operating
lease for facilities for the NetLOCK development efforts. Under the terms of the
lease,  the Company is responsible  for taxes,  insurance,  and  utilities.  The
future minimum  payments  under this operating  lease are $66,000 in fiscal year
1998,  $133,000 in fiscal year 1999, $141,000 in fiscal year 2000 and $24,000 in
fiscal year 2001.

                                       -2-

<PAGE>

         Prior to the acquisition of the NetLOCK technology,  Hughes expended in
excess of $10  million  on  research  and  development  related  to the  NetLOCK
technology.  The Company will not present  audited  financial  statements of the
NetLOCK  development  efforts  as  the  Hughes  NetLOCK  activities  were  not a
business,  but rather a discrete development project. (See Item 7(a) below). The
Company expects to incur expenditures  ranging from $2.5 million to $3.5 million
to complete  the  commercialization  of the  technology  from the  Closing  Date
through the summer of 1998.

Item 7.           Financial Statements and Exhibits

         (a)      The purchase of the software  project,  trade name and certain
                  fixed assets  constituting  the NetLOCK  Product Line does not
                  qualify as a business  acquisition  and  therefore the Company
                  will not present audited financial statements related thereto.
                  The Product Line was not  maintained  in separate  facilities,
                  did not have a  distribution  system,  sales  force,  customer
                  base, or recorded revenues.  In addition, on the Closing Date,
                  the Product Line's  product was  incomplete and  technological
                  feasibility  had not been  established.  Therefore,  financial
                  statements for the unproven Product Line are neither relevant,
                  nor  predictive  of the financial  performance  of the Product
                  Line or the Company.

         (b)      Not applicable

         (c)      Exhibits

                  2.1*     Asset  Purchase  Agreement By and Between the Company
                           and Hughes dated September 17, 1997.

                           Certain  exhibits and  schedules to the Agreement are
                           listed  on page  (iii)  thereto  and  the  Registrant
                           agrees  to  furnish   them   supplementally   to  the
                           Securities and Exchange Commission upon request.

                   10.21*  Software  License  Agreement  between the Company and
                           Mentat Inc. dated September 17, 1997.

 
                   *  Confidential   Treatment  has  been   requested  with
                      respect to certain portions of this exhibit.  Omitted
                      portions   have  been  filed   separately   with  the
                      Securities and Exchange Commission.

                                       -3-
<PAGE>
                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                  Interlink Computer Sciences, Inc.


                                  By: /s/ Gloria Purdy
                                      ------------------------------------------
                                      Gloria Purdy
                                      Vice President and Chief Financial Officer



                                  Dated:  October 3, 1997

                                       -4-

<PAGE>
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549




                                    EXHIBITS
                                       TO
                                    FORM 8-K



                 CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d)
                                       OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                                    ---------

                        Interlink Computer Sciences, Inc.

                                    ---------

                               September 18, 1997

================================================================================

<PAGE>


                                INDEX TO EXHIBITS


                                                                    Sequentially
Exhibit                                                               Numbered
Number                           Description                           Page
- -------                          -----------                        ------------

2.1*       Asset  Purchase  Agreement  by  and  between  the            8
           Company and Hughes dated  September  17, 1997 for
           the   purchase  of  NetLOCK  by  the  Company  in
           consideration   for  cash  and  certain   royalty
           streams


10.21*     Software  License  Agreement  between the Company            41
           and Mentat Inc. dated September 17, 1997.


     *     Confidential  Treatment has been  requested  with
           respect  to  certain  portions  of this  exhibit.
           Omitted  portions have been filed separately with
           the Securities and Exchange Commission.




                            ASSET PURCHASE AGREEMENT
                                                                                
                                     BETWEEN                                    
                                                                                
                        INTERLINK COMPUTER SCIENCES, INC.                       
                                                                                
                                       AND                                      
                                                                                
                             HUGHES AIRCRAFT COMPANY                            
                                                                                
                                                                                
                         Dated as of September 17, 1997                         
                                                                                
                                                                                
                                                                                
<PAGE>                                                                          
                                                                                
                                                                                
<TABLE>                                                                         
                                                                                
                                                          TABLE OF CONTENTS
<CAPTION>                                                                                                                           
                                                                                                                                    
                                                                                                                   Page             
                                                                                                                                    
<S>                                                                                                                  <C>            
ARTICLE I - THE ACQUISITION...........................................................................................1             
                                                                                                                                    
         1.1      Purchase of Assets..................................................................................1             
         1.2      Consideration.......................................................................................3             
         1.3      Transfer of Customers...............................................................................6             
         1.4      Closing.............................................................................................7             
                                                                                                                                    
ARTICLE II - REPRESENTATIONS AND WARRANTIES OF SELLER.................................................................7             
                                                                                                                                    
         2.1      Organization of Seller..............................................................................7             
         2.2      Authority; Consents.................................................................................8             
         2.3      Restrictions on Business Activities.................................................................8             
         2.4      Absence of Liens and Encumbrances...................................................................8             
         2.5      Intellectual Property...............................................................................8             
         2.6      Employee Benefit Plans..............................................................................9             
         2.7      Employee Relations..................................................................................9             
         2.8      Agreements, Contracts and Commitments...............................................................9             
         2.9      Governmental Authorization.........................................................................10             
         2.10     Litigation.........................................................................................10             
         2.11     Brokers' and Finders' Fees; Third-Party Expenses...................................................10             
         2.12     Employee Arrangements..............................................................................10             
         2.13     Environmental Laws.................................................................................10             
         2.14     Compliance with Laws...............................................................................10             
         2.15     Complete Copies of Materials.......................................................................10             
         2.16     No Undisclosed Liabilities.........................................................................10             
         2.17     Sales Information..................................................................................10             
         2.18     Representations Complete...........................................................................11             
                                                                                                                                    
ARTICLE III - REPRESENTATIONS AND WARRANTIES OF BUYER................................................................11             
                                                                                                                                    
         3.1      Organization, Standing and Power...................................................................11             
         3.2      Authority..........................................................................................11             
         3.3      Litigation.........................................................................................11             
         3.4      Cash Consideration.................................................................................11             
                                                                                                                                    
ARTICLE IV - RESTRICTIONS ON COMPETITION.............................................................................12             
                                                                                                                                    
         4.1      Restriction on Competition.........................................................................12             
                                                                                                                                    
                                                                                                                                    
                                                                                                                 
                                                                                                                            
                                                                 -i-
                                                                                                                                    
<PAGE>                                                                                                                              
                                                                                                                                    
                                                                                                                                    
                                                          TABLE OF CONTENTS
                                                             (continued)
                                                                                                                                    
                                                                                                                   Page             
                                                                                                                                    
ARTICLE V - CONDUCT PRIOR TO THE CLOSING DATE........................................................................13             
                                                                                                                                    
         5.1      Conduct of Business of Seller......................................................................13             
         5.2      No Solicitation....................................................................................14             
                                                                                                                                    
ARTICLE VI - ADDITIONAL AGREEMENTS...................................................................................15             
                                                                                                                                    
         6.1      Access to Information..............................................................................15             
         6.2      Confidentiality....................................................................................16             
         6.3      Expenses...........................................................................................16             
         6.4      Public Disclosure..................................................................................16             
         6.5      Best Efforts.......................................................................................16             
         6.6      Notification of Certain Matters....................................................................16             
         6.7      Tax Returns........................................................................................17             
         6.8      Post-Closing Employment of Transitioned Employees..................................................17             
         6.9      Employee Benefits..................................................................................18             
         6.10     Additional Documents and Further Assurances........................................................18             
         6.11     Post-Closing Operation of Product Line on Seller's Premises and                                                   
                    with the Use of Certain of Seller's Equipment....................................................18             
         6.12     Financial Information..............................................................................19             
         6.13     Seller's Cooperation on Obtaining Additional Consents..............................................19             
                                                                                                                                    
ARTICLE VII - SURVIVAL; INDEMNIFICATION..............................................................................19             
                                                                                                                                    
         7.1      Indemnification. ..................................................................................19             
         7.2      Arbitration........................................................................................23             
                                                                                                                                    
ARTICLE VIII - CONDITIONS TO THE ACQUISITION.........................................................................23             
                                                                                                                                    
         8.1      Conditions to Obligations of Each Party to Effect the Acquisition..................................23             
         8.2      Additional Conditions to Obligations of Seller.....................................................24             
         8.3      Additional Conditions to the Obligations of Buyer..................................................24             
                                                                                                                                    
ARTICLE IX - TERMINATION, AMENDMENT AND WAIVER.......................................................................26             
                                                                                                                                    
         9.1      Termination........................................................................................26             
         9.2      Effect of Termination..............................................................................26             
         9.3      Amendment..........................................................................................26             
         9.4      Extension; Waiver..................................................................................27             
                                                                                                                                    
ARTICLE X - GENERAL PROVISIONS.......................................................................................27             
                                                                                                                                    
                                                                                                                  
                                                                                                                            
                                                                -ii-
                                                                                                                                    
<PAGE>                                                                                                                              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
         10.1     Survival of Representations and Warranties.........................................................27             
         10.2     Exclusion of other Representations.................................................................27             
         10.3     Knowledge..........................................................................................27             
         10.4     Notices............................................................................................27             
         10.5     Interpretation.....................................................................................28             
         10.6     Counterparts.......................................................................................29             
         10.7     Entire Agreement...................................................................................29             
         10.8     Assignment.........................................................................................29             
         10.9     Severability.......................................................................................29             
         10.10    Governing Law......................................................................................29             
         10.11    Rules of Construction..............................................................................29             
                                                                                                                              
                                                                                                                                    
         Exhibits and Schedules             Description                                                                             
                                                                                                                                    
         Exhibit A                          Equipment and Assumed Obligations                                                       
                                                                                                                                    
         Exhibit B                          Form of Purchased Price Allocation Schedule                                             
                                                                                                                                    
         Exhibit C                          Sales Information                                                                       
                                                                                                                                    
         Exhibit D                          Transitioned Employees                                                                  
                                                                                                                                    
         Exhibit E                          Form of Secondment Agreement                                                            
                                                                                                                                    
         Exhibit F                          Form of Transitional Services Agreement                                                 
                                                                                                                                    
         Exhibit G                          Form of Employment, Invention Assignment and                                            
                                             Confidentiality Agreement                                                              
                                                                                                                                    
Schedule A  Intellectual Property                                                                                                   
                                                                                                                                    
Schedule B  Contracts                                                                                                               
                                                                                                                                    
Schedule 10.3  Seller's Management Personnel                                                                                        
                                                                                                                                    
Article II Disclosure Schedule                                                                                                      
                                                                                                                              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                -iii-                                                               
</TABLE>
<PAGE>
 



                            ASSET PURCHASE AGREEMENT



         This ASSET  PURCHASE  AGREEMENT (the  "Agreement")  is made and entered
into as of September 17, 1997 by and among Interlink Computer Sciences,  Inc., a
Delaware   corporation   ("Buyer")  and  Hughes  Aircraft  Company,  a  Delaware
corporation ("Seller").


                                    RECITALS

         A.  Buyer is  seeking  to  acquire  substantially  all of the assets of
NetLOCK, a product line of Seller ("NetLOCK").

         B. NetLOCK is a line of products providing  enterprise network security
products  used  to  protect  computer   communications   within  commercial  and
governmental organizations (the "Product Line").

         C. The Boards of Directors of each of Seller and Buyer believe it is in
the best  interests of each company and each company's  respective  stockholders
that Buyer  acquire  from Seller  certain  assets and assume  certain  specified
obligations  of  Seller  which  are  used  to  operate  the  Product  Line  (the
"Acquisition").


                                    AGREEMENT

         NOW, THEREFORE, in consideration of the representations, warranties and
covenants set forth herein, the parties agree as follows:


                                    ARTICLE I

                                 THE ACQUISITION

         1.1       Purchase of Assets.

                  (a) Purchase  and Sale of Assets.  On the terms and subject to
the conditions set forth in this Agreement,  and on the Closing Date (as defined
in Section 1.4(a)),  Seller will sell, convey,  transfer,  assign and deliver to
Buyer,  and Buyer will purchase and acquire from Seller,  all of Seller's right,
title and interest in and to the assets  described below (the "Assets") free and
clear of all  liens,  pledges,  charges,  claims,  security  interests  or other
encumbrances of any sort (collectively,  "Liens") other than Permitted Liens (as
defined in Section 2.4 below). The Assets include certain software including the
NetLOCK family of interoperable  network security products including the NetLOCK
Manager and NetLOCK Agent,  which provide  end-to-end  network  security between
desktop   computers,   laptops  and  servers  using   encryption,   device-level
authentication,  access control and data integrity (the "Software").  The Assets
consist of the following:



                                      

<PAGE>



                        (i)  all  patents,   patent  applications,   copyrights,
trademarks,  service marks and trade names identified on the attached Schedule A
and all related intangible trade secrets,  proprietary  information,  technology
rights and licenses,  all  electronic  rights,  multimedia  rights,  interactive
rights,  moral rights,  new media rights,  reacquisition  rights and publication
rights, proprietary rights and processes,  know-how, research and development in
progress,  and any and all other  intangible  intellectual  property  including,
without limitation, all things authored, discovered,  conceived or first reduced
to practice by Seller or any of its employees in the course of their  employment
with Seller that pertain to the Assets and are used  exclusively or primarily in
the  operation  of the  Product  Line in any  stage  of  development  and all of
Seller's  rights of any kind in or to any of the  foregoing  (collectively,  the
"Intellectual Property");

                        (ii)  all  of  Seller's  rights  and  ownership  of  the
Software,  including  but not limited to all versions of the  Software,  and all
copies of the Software  (including  revisions  and updates in process),  and all
technical,   design,  development,   installation,   operation  and  maintenance
information   concerning   the   Software,   including   source   code,   source
documentation, source listings and annotations, engineering notebooks, test data
and  test  results,  as well as all  reference  manuals  and  support  materials
normally distributed to end-users and potential end-users in connection with the
distribution of the Software;

                        (iii)  all  of  Seller's   claims  against  any  parties
relating exclusively or primarily to any Asset, the Product Line or any Contract
(as defined below)  necessary to operate the Product Line or otherwise  material
to the Product Line,  including without  limitation,  unliquidated  rights under
manufacturers'  and vendors'  warranties or guaranties.  "Contracts"  shall mean
those  agreements,   licenses  and  commitments,   written  or  oral,   relating
exclusively  or  primarily  to the  Product  Line or any of the  Assets to which
Seller is a party,  beneficiary or by which it is bound as described in Schedule
B;

                        (iv) all of Seller's  rights  pertaining to the Software
under all software development, consulting and maintenance Contracts;

                        (v) any rights the Seller has to the NetLOCK  website on
the World Wide Web; provided that the Assets do not include the Internet address
space used by Seller to support  such  website  nor any other  Internet  address
space to which the NetLOCK  website has links;  and  provided  further,  that at
Buyer's  request,  Seller will deliver an electronic copy of the NetLOCK website
to Buyer so that Buyer can  establish  the NetLOCK  website  servers  other than
Seller's.

                        (vi) all  machinery,  equipment,  furniture,  tools  and
supplies used  exclusively or primarily in the operation of the Product Line and
described on the attached Exhibit A (the "Equipment"); and

                        (vii)  customer   lists,   potential   customer   lists,
proposals,   operating   manuals,   business  strategy  plans,   projects  under
development,  lead referral methods,  co-selling arrangements,  distribution and
reseller methods and contacts,  management plans, related business opportunities
and tangible  intellectual  property in Seller's  possession used exclusively or
primarily in the operation of the Product Line.




                                       -2-

<PAGE>



         To the extent delivery of the Assets involves physical delivery, Seller
shall be required to so deliver the Assets at the Closing (as defined in Section
1.4(a)).

         Notwithstanding the foregoing,  the Assets shall not include any of the
following (collectively, the "Excluded Assets"):

                             (A) all of Seller's  cash,  bank  deposits and cash
equivalents,  wherever  located,  and all  billed  receivables  and  receivables
previously  written off which arose out of sales or services  provided by Seller
in operating the Product Line;

                             (B) books  and  records  that  Seller or any of its
affiliates is required to retain  pursuant to any statute,  rule,  regulation or
ordinance  (provided  that,  if such books and records  relate  primarily to the
Product  Line,  Seller  shall  provide  copies  thereof  to Buyer to the  extent
permitted under applicable law);

                             (C) general  books of account and books of original
entry that comprise Seller's permanent accounting or Tax records (which shall be
preserved for a period of five years to permit the audits that Buyer may conduct
pursuant to Section 6.12); and

                             (D)  all of  Seller's  and  any of its  affiliates'
right,  title and  interest in and to any real estate,  including  any such real
estate used in  connection  with the Product Line,  and the related  fixtures or
leasehold  improvements,  and the permits relating to the ownership or occupancy
of such real estate,  fixtures or improvements,  subject to Buyer's right to use
the facilities as set forth in Section 6.11 below.

                  (b)  Assumption of  Obligations.  Buyer shall assume only such
liabilities  and  obligations  of Seller  described  on  Exhibit  A as  "Assumed
Obligations"  (collectively,  the "Assumed  Obligations").  Without limiting the
foregoing,  it is expressly agreed that, other than the Assumed  Obligations set
forth on Exhibit A, Buyer shall not assume any other liabilities or obligations,
including  those for  employment,  income,  sales,  property  or other Taxes (as
defined in Section 1.2(c)) incurred or accrued by Seller or that would have been
accrued under generally accepted  accounting  principles assuming Seller reports
taxes on the accrual method of accounting.  Contracts that are listed on Exhibit
A as  "Assumed  Obligations"  are being  assumed  only if the rights  under such
Contracts are being assigned to Buyer at the Closing (as defined below).

         1.2       Consideration.

                  (a)  Consideration for Assets. On the terms and subject to the
conditions  set  forth  in this  Agreement,  as full  payment  for the  selling,
conveyance,  transfer, assignment and delivery of the Assets by Seller to Buyer,
at the Closing Buyer shall pay to Seller the "Purchase Price" of $1,000,000 plus
$1,143,822 for the Equipment,  subject to adjustment as herein provided, by wire
transfer of immediately available funds (the "Cash Payment").




                                       -3-

<PAGE>



                  (b) Royalty.

                        (i) Amount.  As further  consideration  for the Software
and provided that Seller shall perform all the terms and conditions  required of
Seller  under this  Agreement,  Buyer  agrees to pay,  with no  minimum  royalty
commitment  by Buyer [*] of Net Revenues (as defined  below)  derived from sale,
distribution  or  sublicensing  of  the  Software,  including  any  modification
thereof, and including related service, consulting, support and warranty-related
revenues,  and any related  maintenance  fees (both  original and, to the extent
calculated   pursuant   to  clause   (ii)  below,   renewal   maintenance   fees
(collectively, the "Sales") for the five-year period following the Closing Date.
However,  the maximum royalty payable by Buyer under this Agreement shall be [*]
(the "Maximum Royalty  Obligation").  In addition,  no royalty commitments shall
become due for any Net  Revenues  received  after the fifth  anniversary  of the
Closing Date of this Agreement.

                        (ii)  Definition.  "Net  Revenues"  means  any  and  all
royalties,  fees,  or other  amounts  invoiced  by Buyer and its  affiliates  in
connection  with Sales,  net of any  arm's-length  amounts paid by Buyer or such
affiliates on account of sales and other applicable  taxes,  duties,  freight or
shipping charges, insurance,  commissions, tariffs, and the like, and net of any
revenues (a) obtained in connection with  consulting or other services  rendered
in installing and implementing  software at client sites and (b) any net refunds
for actual  returns as  provided  in the last  paragraph  of this  clause  (ii).
Notwithstanding the foregoing, (i) no royalty amount will be due or payable with
respect to  inter-company  Sales by Buyer to its  affiliates  or within  Buyer's
internal  organization  to the extent the  products,  services  or  intellectual
property  so  transferred  or other uses are for the  research  and  development
purposes of Buyer or its  affiliates  and not intended for the use by or benefit
for any third  party,  (ii) the royalty  amount due and payable  with respect to
inter-company  Sales  (other than those  described in clause (i) above) shall be
based on assumed net revenues  equal to the net  revenues  that would be derived
from similar Sales  involving  arm's-length  transactions  with unrelated  third
parties,  and  (iii)  to the  extent  any  royalty  amount  has  been or will be
concurrently  paid with  respect  to  inter-company  Sales,  where the  product,
service or intellectual property so transferred or other uses are intended to be
re-Sold to  unrelated  parties,  a royalty  amount  shall be due and  payable in
connection with such intended re-Sales to unrelated third parties,  after giving
credit  to  any  royalty  amount  paid  or to  be  paid  with  respect  to  such
inter-company Sales.

                  In a bundled  transaction  involving both the Software and one
or more other products, "Net Revenues" shall include only the amount invoiced by
Buyer in the transaction  allocated between the Software and such other products
in accordance  with Buyer's  published  standard  prices in good faith by Buyer.
Royalties on renewal  maintenance fees will be calculated annually in good faith
by Buyer  using  an  allocation  methodology  based  on the  ratio of the  value
attributable to NetLOCK-based  renewal maintenance fees as compared to the total
value of all renewal maintenance fees covered by the applicable invoices.

                  If (i) a royalty is paid pursuant to this Section 1.2(c),  and
(ii) the  product on which the  royalty  was paid is returned to Buyer and (iii)
the party  returning  the  product is  refunded  the amount  paid  (rather  than
accepting a replacement product on which a royalty would be due), Buyer shall be
entitled to set off the royalty already paid to Seller for the product  returned
against future royalty  obligations.  If there are no future royalty obligations
because of the expiration of the royalty  period or because the maximum  royalty
has already  been paid,  Buyer will notify  Seller of the return and Seller will
reimburse Buyer for the royalty paid to Seller.

                                       -4-


- ---------------------------------
*Confidential Treatment Requested

<PAGE>



                        (iii) Notices and Payment.  Within sixty (60) days after
the end of each  calendar  quarter (or  portion  thereof)  during the  five-year
period  following the Closing Date in which Net Revenues exceed a minimum of one
hundred  dollars,  Buyer shall furnish to Seller written  reports,  certified by
Seller's  Chief  Financial  Officer as being true and correct (and shall be in a
form reasonably  satisfactory  to Seller) setting out for the previous  quarter,
the Net Revenues  derived from the Sales (other than renewal  maintenance  fees)
and the royalties due to Seller.  Within that sixty (60) day period, Buyer shall
also pay to Seller the royalties  due.  Royalties for renewal  maintenance  fees
will be paid annually,  not later than ninety (90) days after closing the fiscal
year.  All  payment  shall be made by  Buyer  to  Seller,  by wire  transfer  of
immediately  available  funds,  to such account as shall be designated by Seller
from time to time in writing.  In the event any royalty  amount due hereunder is
not paid by Buyer by the applicable due date, and after written notice by Seller
to Buyer of any such failure to pay  royalties,  such late payment shall be paid
to Seller with interest  thereon,  from the  applicable  due date to the date of
payment, calculated at the per annum rate equal to the rate announced by Bank of
America as its "prime  rate" or "base  rate" as of the close of  business on the
applicable due date.  Subject to the notice  requirements and other  limitations
set forth in Section  7.2 below,  Buyer  shall have the right to set off against
any sums due to Seller  under  this  Agreement  any sums due from the  Seller to
Buyer, including any overpayments of royalties or advances, until such sums have
been recouped or paid.  With regard only to the allocation  made by Buyer of the
revenues  from renewal  maintenance  fees,  Seller has twenty (20) business days
from the date of Seller's  receipt of the report furnished under this subsection
to object to or dispute such allocation,  by setting forth in writing the amount
of royalties in disagreement and the nature of such objection or dispute. Within
15 days of receipt by Buyer of Seller's notice,  Buyer and Seller shall attempt,
in good faith, to resolve the differences. If Buyer and Seller,  notwithstanding
such good faith effort,  shall have failed to resolve the differences  within 30
days after the  expiration of such 15-day  period,  then any remaining  disputed
matters  shall be finally and  conclusively  determined  pursuant to Section 7.2
herein.

                        (iv) Withholding for Taxes.  Buyer is hereby  authorized
by Seller to withhold  and make payment of, on behalf of Seller,  or  otherwise,
all taxes,  duties or levies the  withholding  of which may from time to time be
required by the  government  of the U.S. or any other  country,  or any agencies
thereof,  on the royalties or other payments due to Seller under this Agreement.
Such taxes, duties or levies shall be deducted from payments made to Seller, and
Buyer shall provide Seller with appropriate  receipts for all such payments made
by them on behalf of and for the benefit of Seller.

                        (v)  Records/Inspection.   Buyer  shall  retain  at  its
principal  place of business for a period of not less than three (3) years after
the calendar quarter to which such records relate,  files, records, and books of
account  prepared in the normal course of business which contain data reasonably
required for the computation and  verification of the amounts to be paid and the
information to be provided in any royalty report  required under this Agreement.
For the purposes of verifying the royalties paid by Buyer,  Seller may, not more
than once in each  twelve  (12)  month  period  and once  within  six (6) months
following any breach or termination of this Agreement, retain a certified public
accountant approved by Buyer, which approval shall not unreasonably be withheld,
to audit those  business  records of Buyer which relate to  royalties  due under
this Agreement,  provided (i) that such accountant execute Buyer's  then-current
standard  non-disclosure  agreement,  and (ii) that Seller gives sixty (60) days
written  notice  prior to the audit,  and (iii)  that all  audits are  conducted
during  regular  business  hours and on  Buyer's  premises.  Buyer  shall not be
required to provide any  information  to the auditor with respect to any royalty
report submitted to Seller more than thirty-six (36) months prior to the date on
which Buyer receives Seller's request for an audit. The auditor's report and all
work papers or other materials relating



                                       -5-

<PAGE>



to the  auditor's  examination  of Buyer's  books and records will be treated as
confidential information owned by Buyer.

                  (c) Transaction Taxes. Seller shall pay and promptly discharge
when due all Taxes (as defined below) and recording  imposed or levied by reason
of the sale of the  Assets to  Buyer.  For the  purposes  of this  Agreement,  a
reference to "Tax" or, collectively,  "Taxes," means any and all federal, state,
local and foreign taxes,  assessments and other  governmental  charges,  duties,
impositions  and  liabilities,  including  taxes based upon or measured by gross
receipts,  income,  profits,  sales,  use and  occupation,  and value added,  ad
valorem,  transfer,  franchise,  withholding,  payroll,  recapture,  employment,
excise and property taxes,  together with all interest,  penalties and additions
imposed with respect to such amounts and any obligations under any agreements or
arrangements  with any other person with  respect to such amounts and  including
any liability for taxes of a predecessor entity.

                  (d) Purchase Price Allocation.  Buyer shall deliver a schedule
to Seller, in the form of Exhibit B, allocating the Cash Payment and the Assumed
Obligations  among the Assets not later  than 60 days  after the  Closing  Date.
Within 30 days after receipt of such  schedule,  Seller shall provide Buyer with
its comments, if any, by setting forth in writing any portion of such allocation
with which Seller does not agree. Within 15 days of receipt by Buyer of Seller's
comments,  Buyer and  Seller  shall  attempt,  in good  faith,  to  resolve  the
differences. If Buyer and Seller,  notwithstanding such good faith effort, shall
have failed to resolve the  differences  within 30 days after the  expiration of
such 15-day  period,  then any remaining  disputed  matters shall be finally and
conclusively  determined  by a "Big 6"  independent  auditing firm of recognized
national  standing,  which shall not be the general  auditor for either Buyer or
Seller, to be mutually selected by Buyer and Seller.  The fees and disbursements
of any such arbitrator  shall be shared equally by the parties.  For purposes of
all Taxes, Buyer and Seller agree (i) to report the transactions contemplated in
this Agreement in a manner  consistent  with the  allocation  under this Section
1.2(e),  and (ii) that  neither  of them shall  take any  position  inconsistent
therewith  in any  Tax  return,  in any  refund  claim,  in any  litigation,  or
otherwise.

         1.3      Transfer of Customers.

                  (a) Intent. It is the intent of parties hereto that all of the
Assets and all of Seller's backlog,  if any, arising out of the operation of the
Product Line be  transferred  to Buyer.  Accordingly,  the parties  agree to use
their  reasonable  best efforts to facilitate such transfer of customers as soon
as possible.  For purposes of this  Agreement,  the  "reasonable  best  efforts"
standard shall not require a party hereto to pay money to any third party solely
as an inducement for performance by such third party.

                  (b)  Purchase  Order  Data.  Included  on  Exhibit  C  is  the
following  information  (hereinafter  collectively  referred  to as  the  "Sales
Information"):  (i) a list of all outstanding written customer orders,  purchase
orders and other customer  commitments  from Seller's  current  customers of the
Business  and (ii) the names of all  customers  of the  Business  (the  "Current
Customers").

                  (c)  Assignments.  Prior to the  Closing,  Seller shall assign
Seller's rights and benefits under the Contracts to Buyer as of the Closing.

         1.4       Closing.




                                       -6-

<PAGE>



                  (a)  Closing.  Unless  this  Agreement  is earlier  terminated
pursuant to Section 9.1, the closing of the  transactions  contemplated  by this
Agreement  (the  "Closing")  shall  be held at the  offices  of  Wilson  Sonsini
Goodrich & Rosati,  P.C., 650 Page Mill Road,  Palo Alto, CA 94040, at 1:30 p.m.
(Pacific  time) on September 18, 1997,  provided the  conditions to closing have
been  satisfied,  or at such  other  time or on such other date as the Buyer and
Seller agree (the actual date on which the Closing  occurs is referred to herein
as the "Closing Date"); provided that no party shall be obligated to close after
September 19, 1997.

                  (b) Delivery. At the Closing:

                        (i) Buyer  shall  deliver  to Seller  an  instrument  of
assumption of obligations by which Buyer shall assume the Assumed Obligations as
of the Closing Date;

                        (ii)  Seller  shall  deliver to Buyer all bills of sale,
endorsements,  assignments,  consents to assignments  and other  instruments and
documents as Buyer may reasonably  request for Seller to sell,  convey,  assign,
transfer  and deliver to Buyer all right,  title and  interest to all the Assets
free and clear of any and all Liens (other than Permitted Liens); and

                        (iii) Seller,  on the one hand, and Buyer,  on the other
hand,  shall deliver or cause to be delivered to one another the instruments and
documents  required under Article VIII and such other  instruments and documents
necessary or appropriate to evidence the due execution, delivery and performance
of this Agreement.


                                   ARTICLE II

                    REPRESENTATIONS AND WARRANTIES OF SELLER

         Except as set forth on the disclosure  schedule  delivered by Seller to
Buyer prior to the execution of this Agreement (the "Disclosure Schedule"),  the
Seller represents and warrants to Buyer as follows:

         2.1  Organization  of Seller.  Seller is a corporation  duly organized,
validly  existing and in good standing  under the laws of the State of Delaware.
Seller  has the  corporate  power  to own its  properties  and to  carry  on its
business as now being conducted.  Seller is duly qualified to do business and is
in good standing in each  jurisdiction in which failure to be so qualified would
have a material  adverse  effect on the Assets or the Product Line  (hereinafter
referred to as a "Material Adverse Effect").

         2.2 Authority;  Consents.  Seller has all requisite corporate power and
authority  to enter  into this  Agreement  and to  consummate  the  transactions
contemplated  hereby and to own,  license or lease the Assets and to operate and
use the  Assets  and to  carry  on its  business  as  presently  conducted.  The
execution and delivery of this  Agreement and Exhibits and the  consummation  of
the  transactions  contemplated  hereby and thereby have been duly authorized by
all necessary  corporate  action on the part of Seller.  This  Agreement and the
Exhibits  hereto have been duly  executed and delivered by Seller and are valid,
binding and  enforceable  obligations  of Seller.  The execution and delivery of
this  Agreement  and the Exhibits  hereto by the Sellers do not,  and, as of the
Closing,  the consummation of the transactions  contemplated  hereby and thereby
will not, conflict with, or result in any violation of, or default under or



                                       -7-

<PAGE>



give rise to a right of termination or acceleration of any obligation or loss of
any benefit  under (any such  event,  a  "Conflict")  (i) any  provision  of the
Certificate  of  Incorporation  or Bylaws of  Seller  or (ii) any  agreement  or
instrument,  permit,  judgment,  statute,  law, rule or regulation applicable to
Seller or the Assets. No consent, waiver, approval, or registration, declaration
or filing  with,  any  court,  administrative  agency or other  federal,  state,
county, local or foreign governmental  authority,  or agency having jurisdiction
over the  Seller  ("Governmental  Entity")  or any third  party (so as to enable
Seller to assign  Buyer the Assets and all of the  Seller's  rights and benefits
under the  Contracts),  is required by or with  respect to Seller in  connection
with the  execution  and  delivery  of this  Agreement  or the  Exhibits  or the
consummation of the transactions contemplated hereby or thereby.

         2.3  Restrictions  on  Business  Activities.  There  is  no  agreement,
commitment,  judgment,  injunction,  order or decree  binding upon Seller or the
Assets which has or could reasonably be expected to have the effect of impairing
any use by Buyer of the  Assets  or  operations  by  Buyer of the  Product  Line
following the Closing.

         2.4 Absence of Liens and  Encumbrances.  Seller has all right title and
interest  to all of the  Assets,  free  and  clear  of any  Liens,  except  such
imperfections  of title as do not materially  detract from or interfere with the
present  use  of  the  assets  subject  to or  affected  thereby,  or  otherwise
materially impair the use of such assets,  which are set forth on the Disclosure
Schedule,  and inchoate statutory liens for real and personal property taxes not
yet due or payable (the  "Permitted  Lien").  Seller has full right and power to
(and at the Closing  will)  transfer  and deliver to Buyer all right,  title and
interest  to all the Assets  free and clear of all Liens,  except for  Permitted
Liens.

         2.5      Intellectual Property.

                  (a)  Section  2.5 of the  Disclosure  Schedule  sets  forth  a
complete and accurate  schedule of all of the  following  Intellectual  Property
used  primarily or  exclusively  in the  development or operation of the Product
Line:  (i) all patents and patent  applications  owned by Seller,  including the
country of filing, filing number, date of issue, expiration date and title; (ii)
all  registered  trademarks and service marks and all trademark and service mark
applications,  including  country of filing,  filing  number,  date of issue and
expiration date; (iii) all common law trademarks, service marks and trade names;
(iv) all registered and unregistered  copyrights;  (v) all computer software and
documentation;  (vi) all license,  option and other agreements pursuant to which
Seller acquired rights to any Intellectual Property and all license,  option and
other agreements,  oral or written, pursuant to which Seller is obligated to pay
royalties  or  other   consideration  to  third  parties  with  respect  to  any
Intellectual Property; and (vii) all license, option and other agreements,  oral
or written,  pursuant  to which  Seller has granted any third party any right to
any  Intellectual  Property.   Complete  and  accurate  copies  of  all  written
agreements  referred  to in the  foregoing  clauses  (vi) and  (vii)  have  been
provided to Buyer.

                  (b) (i) Seller has all right, title and interest in and to the
Intellectual  Property  used  primarily or  exclusively  in the  development  or
operation  of the  Product  Line;  (ii) to the  Seller's  knowledge,  Seller has
neither incorporated into nor relied on any software,  technology or proprietary
information  of any third party in the  creation of the  Software,  unless given
permission  to so under a written  agreement,  (iii) to the Seller's  knowledge,
Seller is not making use of any invention,  software,  technology or proprietary
information  in  connection  with the  Software  in which  any  present  or past
employee  of Seller or any other  person has or has  claimed an  interest;  (iv)
Seller is in compliance in all



                                       -8-

<PAGE>



material  respects  with  all  agreements  pursuant  to which  it  acquired  any
Intellectual Property; (v) to the Seller's knowledge,  the Intellectual Property
does not infringe  upon any patent,  trademark,  trade name,  copyright or other
intellectual  property right of any third party; (vi) to the Seller's knowledge,
no third party has asserted or threatened to assert against Seller or any of its
officers or directors any conflicting rights to any Intellectual Property; (vii)
Seller  has no  knowledge  that any third  party is  infringing  upon any of the
Intellectual  Property;  (viii) the  Intellectual  Property will not be rendered
invalid or adversely affected in any way by virtue of the execution, delivery or
performance  of  this  Agreement  or  the  Exhibits  or  the  occurrence  of the
transactions contemplated hereby or thereby.

         2.6      Employee Benefit Plans.

                  Buyer will not succeed to any liability  under any of Seller's
employee benefit plans or any other employee benefit of Sellers by virtue of the
transactions contemplated by this Agreement.

         2.7 Employee Relations.  Seller has, with regard to employees primarily
employed in connection with the Product Line, complied with all applicable laws,
rules and  regulations  which relate to  employment  and  collective  bargaining
(including pay and  discrimination) and to the operation of the Product Line and
is not liable for any arrears of wages or any taxes or penalties  for failure to
comply with any of the  foregoing,  except  where such  noncompliance  would not
reasonably be expected to have a Material Adverse Effect.  Seller is not a party
to, and is not threatened  with, any dispute or controversy with a union or with
respect to  unionization  or  collective  bargaining  involving the employees of
Seller who work with NetLOCK.

         2.8  Agreements,  Contracts  and  Commitments.  Seller has not received
written  notice that it has breached,  violated or defaulted  under,  any of the
terms or conditions  of any Contract.  Each Contract is in full force and effect
and,  to the  knowledge  of Seller,  the other  party to such  Contract  has not
breached,  violated or  defaulted  under any of the terms or  conditions  of any
Contract.  Seller  has  obtained,  or  will  use  its  reasonable  best  efforts
consistent with good business  practice to obtain prior to the Closing Date, all
necessary  consents,  waivers and  approvals  of parties to any  Contract as are
required  to  assign  all  rights  and  benefits  thereunder  to Buyer as of the
Closing.

         2.9  Governmental   Authorization.   No  consent,   permit,   or  other
authorization  by a Governmental  Entity is required for the use or operation of
the Assets  prior to the  Closing  Date and to the  Seller's  knowledge  none is
required for the use or operation  of the Assets  thereafter,  the holding of an
interest in the Assets by Seller or the  transfer,  in part or in whole,  of the
Assets to Buyer.

         2.10 Litigation.  There is no action,  suit or proceeding of any nature
pending or, to  Seller's  knowledge,  threatened  against  Seller that  relates,
directly or indirectly,  to the Product Line, the Assets. No Governmental Entity
has at any time notified Seller of any challenge or question regarding the legal
right of Seller  to  manufacture,  offer or sell any  products  relating  to the
Product Line in the present manner or style thereof.

         2.11 Brokers' and Finders' Fees;  Third-Party Expenses.  Seller has not
incurred, nor will it incur, directly or indirectly, any liability for brokerage
or finders'  fees or agents'  commissions  or any similar  charges in connection
with this Agreement of the Exhibits or any  transaction  contemplated  hereby or
thereby.



                                       -9-

<PAGE>



         2.12 Employee  Arrangements.  No current  employee of Seller engaged in
the  operation  of the  Product  Line  is  subject  to any  agreement  or  other
arrangement  that would in any manner hinder or obstruct the employment by Buyer
of such  individual,  or result in any payments by Buyer in connection with such
employment.

         2.13  Environmental  Laws. Insofar as it relates to the Product Line or
could  reasonably be anticipated to affect the Assets,  Seller is in compliance,
in all material  respects,  with all applicable laws or regulations  relating to
the protection of the environment or concerning the handling,  storage, disposal
or discharge of toxic materials (collectively,  "Environmental Laws"), and there
is no  pending  or, to  Seller's  knowledge,  threatened,  action or  proceeding
against Seller  alleging  violations of the  Environmental  Laws relating to the
Product Line.

         2.14  Compliance  with  Laws.  Seller  has  complied,  in all  material
respects,  with and has not received  any notices of violation  with respect to,
any federal,  state or local  statute,  law or  regulation,  domestic or foreign
applicable to Seller relating to the Product Line.

         2.15  Complete  Copies of  Materials.  A true and complete copy of each
document listed on Schedule B has been delivered to Buyer by Seller.

         2.16 No  Undisclosed  Liabilities.  NetLOCK  does not have any material
liability,  indebtedness,  obligation,  expense, claim, deficiency,  guaranty or
endorsement  of  any  type,  whether  accrued,  absolute,  contingent,  matured,
unmatured or other, which,  individually or in the aggregate,  will by operation
of law or otherwise  become a liability or  obligation of Buyer by virtue of the
transactions contemplated by this Agreement, except for the Assumed Obligations.

         2.17 Sales  Information.  The Sales  Information set forth on Exhibit C
hereto is  accurate  and  complete  in all  material  respects  and the  Current
Customers included on such schedule represent bona fide customers of Seller.

         2.18 Representations  Complete.  Seller has not intentionally concealed
any fact,  circumstance or condition of any kind or nature  whatsoever  known to
Seller which is material to the Product Line.


                                   ARTICLE III

                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer represents and warrants to the Seller as follows:

         3.1  Organization,  Standing  and Power.  Buyer is a  corporation  duly
organized,  validly existing and in good standing under the laws of the State of
Delaware.  Buyer has the corporate  power to own its  properties and to carry on
its business as now being conducted.  Buyer is duly qualified to do business and
is in good standing in each jurisdiction in which the failure to be so qualified
would have a material  adverse  effect on the ability of Buyer to consummate the
transactions contemplated hereby.




                                      -10-

<PAGE>



         3.2 Authority;  Consents.  Buyer has all requisite  corporate power and
authority to enter into this  Agreement and the Exhibits and to  consummate  the
transactions contemplated hereby and thereby. The execution and delivery of this
Agreement and the Exhibits and the consummation of the transactions contemplated
hereby and thereby have been duly authorized by all necessary  corporate  action
on the part of Buyer.  This  Agreement  and the Exhibits have been duly executed
and  delivered by Buyer and  constitutes  the valid and binding  obligations  of
Buyer,  enforceable in accordance with their terms except as such enforceability
may be limited by bankruptcy  or similar laws and general  principles of equity.
The execution and delivery of this Agreement and the Exhibits by Buyer does not,
and, as of the Closing, the consummation of the transactions contemplated hereby
and thereby will not,  conflict  with (i) any  provision of the  Certificate  of
Incorporation  or Bylaws of Buyer or (ii) any agreement or  instrument,  permit,
judgment,  statute,  law,  rule or regulation  applicable to Buyer.  No consent,
waiver, approval, or registration,  declaration or filing with, any Governmental
Entity or any third party is required by or with respect to Buyer in  connection
with the  execution  and  delivery  of this  Agreement  or the  Exhibits  or the
consummation of the transactions contemplated hereby or thereby.

         3.3  Litigation.  There is no action,  suit or proceeding of any nature
pending or, to Buyer's knowledge, threatened against Buyer that could reasonably
be  expected  to have a  material  adverse  effect  on the  ability  of Buyer to
consummate the transactions contemplated hereby.

         3.4 Cash  Consideration.  Buyer  currently  has  available,  and at the
Closing Date of the Acquisition will continue to have available, sufficient cash
to enable it to perform its obligations under this Agreement.


                                   ARTICLE IV

                           RESTRICTIONS ON COMPETITION

         4.1      Restriction on Competition.

                  (a)  Restricted  Activities  for Seller.  At no time after the
Closing  will Seller  represent  to any third  party that  Seller  still owns or
operates the Product Line or is the  successor in interest of the Product  Line.
In  addition,  for a period of three (3) years  beginning  on the Closing  Date,
Seller shall not:

                        (i) engage in or own any  interest  (except as a passive
investor of less than five  percent  (5%) of total debt and equity of a publicly
traded  company) in, any business or other  activity that would compete with the
Product Line as currently conducted; or

                        (ii)  divert  or  attempt  to  divert  any  existing  or
prospective  business or customers of Buyer  (including any affiliates of Buyer)
as it relates to the operation of the Product Line as currently conducted to any
other person or entity,  by direct or indirect  inducement or otherwise,  in any
business  or other  activity  competitive  with the  Product  Line as  currently
conducted; or provided,  however, nothing herein shall preclude Seller or any of
its affiliates from (1) acquiring from third parties products,  even if included
in the Product Line,  for internal  consumption  or for use as components in its
own products or (2) acquiring,  and thereafter operating, any business or entity
(an "Acquired  Business"),  provided  that the Acquired  Business is not, at the
time of acquisition by Seller or its affiliates, primarily



                                      -11-

<PAGE>



engaged in activities which if conducted by Seller would be precluded under this
Section  4.1(a);  provided  further that nothing herein shall preclude  Raytheon
Company,  any  affiliate of Raytheon  Company,  any company  resulting  from the
merger of Raytheon  Company and HE Holdings,  Inc.,  or any  affiliate of an any
such  resulting  company from  engaging in any business  activity  engaged in by
Raytheon  Company or its affiliates  prior to the  consummation  of the proposed
merger between HE Holdings,  Inc. and Raytheon  Company and any such  engagement
shall not be deemed a  violation  by Seller or its  affiliates  of this  Section
4.1(a).

                  (b) Restriction on Employee Solicitation.  For a period of two
(2) years beginning on the Closing Date, the Seller shall not solicit any person
for employment who was an employee of Seller with respect to the Product Line as
of the Closing Date and who is at that time already  employed by Buyer or any of
its  affiliates,  or otherwise  directly or indirectly  induce or seek to induce
such  person to leave  his or her  employment  with  Buyer;  provided,  however,
nothing herein shall preclude  Seller or any of its affiliates  from  soliciting
the  employment  of any employee of Buyer (i) who ceases to be employed by Buyer
without  inducement by Seller or (ii) as part of a general  solicitation  to the
public or to people having skills similar to such employee of Buyer which is not
specifically directed to the employees of Buyer.

                  (c)      Scope of Restriction.

                        (i)  This  Section  constitutes  a  series  of  separate
covenants  for each county,  state  (including  the  District of  Columbia)  and
country in which Buyer or an affiliate of Buyer transacts business.

                        (ii) In the  event  that  any  other  provision  of this
Section or the  application of any such provision shall be held to be prohibited
or  unenforceable  in  any  jurisdiction,  such  provision  shall,  as  to  such
jurisdiction,   be   ineffective   to  the   extent  of  such   prohibition   or
unenforceability.  The  remaining  provisions  of this  covenant to refrain from
competition  shall remain in full force and effect,  and any such prohibition or
unenforceability   in  any   jurisdiction   shall  not   invalidate   or  render
unenforceable  such provision in any other  jurisdiction.  The parties shall use
their best efforts to replace the provision that is contrary to law with a legal
one approximating to the extent possible the original intent of the parties.

                  (d) Ancillary  Agreement.  The parties  acknowledge that their
agreements  in  this  Section  4.1 are  ancillary  to an  otherwise  enforceable
agreement.


                                    ARTICLE V

                        CONDUCT PRIOR TO THE CLOSING DATE

         5.1 Conduct of  Business of Seller.  During the period from the date of
this  Agreement  and  continuing  until the earlier of the  termination  of this
Agreement or the Closing Date,  Seller agrees,  with respect to the operation of
the Product  Line  (except to the extent that Buyer shall  otherwise  consent in
writing,  which consent  shall not be  unreasonably  withheld),  to carry on the
Business in substantially the same manner as conducted  immediately prior to the
date of this Agreement, and continue to pay its debts and taxes when due, to pay
or perform other obligations when due, and use reasonable efforts to preserve



                                      -12-

<PAGE>



intact the NetLOCK's  Assets and Equipment that are being  acquired  pursuant to
this Agreement, all material relationships with third parties that have existing
written or oral agreements with Seller with respect to the NetLOCK Product Line,
and  services  of  NetLOCK's  present  officers  and  employees,  subject to the
distribution  of layoff  notices to all such employees by Seller on September 2,
1997. Seller shall promptly notify Buyer of any event or occurrence or emergency
not in the ordinary course of business of Seller, and any event which could have
a Material Adverse Effect.  Except as expressly  contemplated by this Agreement,
Seller  shall not,  without the prior  written  consent of Buyer (which shall be
given,  or  reasonably  withheld  within two (2) business  days after receipt of
written request therefor and in the event that Buyer fails to respond at the end
of the  second  business  day,  such  lack of  response  shall be deemed to be a
consent) and notwithstanding the foregoing:

                  (a)  Enter  into  any  commitment  or  transaction   primarily
related, directly or indirectly, to the operation of the Product Line not in the
ordinary course of business;

                  (b)  Transfer  to any person or entity any rights to  Seller's
Intellectual  Property  primarily  related,   directly  or  indirectly,  to  the
operation of the Product  Line other than in the ordinary  course of business in
conjunction  with  license  agreements  of the Seller's  commercially  available
products;

                  (c) Enter into or amend any  agreements  pursuant to which any
other party is granted marketing,  distribution or similar rights of any type or
scope with  respect to any  products of Seller  primarily  related,  directly or
indirectly,  to the  operation  of the Product  Line other than in the  ordinary
course of  business in  conjunction  with  license  agreements  of the  Seller's
commercially available products;

                  (d) Amend or otherwise  modify (or agree to do so),  except in
the ordinary course of business, or violate the terms of the Contracts;

                  (e) Commence any  litigation  primarily  related,  directly or
indirectly, to the operation of the Product Line;

                  (f)  Acquire or agree to  acquire by merging or  consolidating
with, or by  purchasing a substantial  portion of the assets of, or by any other
manner,  any  business or any  corporation,  partnership,  association  or other
business  organization  or division  thereof,  or otherwise  acquire or agree to
acquire any assets which are material,  individually or in the aggregate, to the
Product Line;

                  (g) Sell,  lease,  license or otherwise  dispose of any of the
Assets;

                  (h) As it relates  to the  Seller's  employees  engaged in the
operation of the Product  Line,  adopt or amend any employee  benefit  plan,  or
enter into any  employment  contract,  pay or agree to pay any special  bonus or
special  remuneration  to any director or employee,  or increase the salaries or
wage rates;

                  (i) Revalue any of the  Equipment  other than in the  ordinary
course of business;

                  (j) Grant any security interest in any of the Assets;



                                      -13-

<PAGE>



                  (k) Pay,  discharge  or  satisfy,  in any  amount,  any claim,
liability or obligation (absolute,  accrued, asserted or unasserted,  contingent
or  otherwise),  other  than  the  payment,  discharge  or  satisfaction  of the
foregoing  in the  ordinary  course of  business;  provided,  further  that this
subsection  (k) shall not apply to actions  taken with respect to any  unassumed
Liabilities  so long as such actions do not  adversely  affect the Assets or the
Business;

                  (l) Take, or agree in writing or otherwise to take, any of the
actions  described in Sections  5.1(a) through 5.1(k) above, or any other action
that would  prevent  Seller from  performing  or cause Seller not to perform its
covenants hereunder.

         5.2 No  Solicitation.  Until (i) the  Closing  Date or (ii) the date of
termination of this  Agreement  pursuant to the provisions of Article IX hereof,
as the case may be,  Seller will not (and Seller  will use its  reasonable  best
efforts   not  to  permit  any  of   Seller's   officers,   directors,   agents,
representatives  or  Affiliates  to)  directly  or  indirectly,  take any of the
following actions with any party other than Buyer and its designees:

                  (a)  solicit,   encourage,   initiate  any   negotiations   or
discussions with respect to, any offer or proposal to acquire all or any portion
of Seller's business and properties or capital stock whether by merger, purchase
of assets, tender offer or otherwise;

                  (b)  except as  required  by law (in the  written  opinion  of
outside  counsel),  including  fiduciary  duties  required by law,  disclose any
information  relating  to any  potential  acquisition  of all or any  portion of
Seller's business and properties or capital stock whether by merger, purchase of
assets,  tender offer or  otherwise  to any person  other than its  attorneys or
financial advisors  concerning Seller's business and properties or afford to any
person or entity access to its properties, books or records;

                  (c) any negotiations or discussions with respect to, any offer
or proposal to acquire all or any portion of Seller's business and properties or
capital stock whether by merger,  purchase of assets, tender offer or otherwise,
except as required by  applicable  fiduciary  duties (in the written  opinion of
outside  counsel)  and  following  written  notice to the Buyer  (with a duty to
promptly update Buyer as such discussions proceed or terminate) of the nature of
such  discussions  including  the name of the  third  party and the terms of the
proposal (including price); or

                  (d) assist or  cooperate  with any person to make any proposal
to purchase  all or any part of  Seller's  capital  stock or assets,  other than
selling products of Seller in the ordinary course of business.

                  In the event  Seller  shall  receive  any  offer or  proposal,
directly or indirectly,  of the type referred to in clause (a) or (c) above,  or
any request for disclosure or access pursuant to clause (b) above,  Seller shall
immediately inform Buyer in writing as to any such offer or proposal.


                                   ARTICLE VI

                              ADDITIONAL AGREEMENTS




                                      -14-

<PAGE>



         6.1  Access  to   Information.   Seller  shall  afford  Buyer  and  its
accountants,  counsel and other  representatives  reasonable access at NetLOCK's
principal place of business during normal business hours during the period prior
to the  Closing  Date  to (a)  all of  Seller's  properties,  books,  contracts,
commitments  and records  primarily  relating to the Assets and the Product Line
and (b) all other  information  concerning  the Assets and the Product Line, and
related personnel (subject to restrictions  imposed by applicable law) of Seller
as Buyer may  reasonably  request.  Seller agrees to maintain and retain any and
all information regarding the Product Line and Assets on or prior to the Closing
Date which are reasonably  necessary for Buyer to calculate the  availability to
it of tax credits  under the  Internal  Revenue  Code of 1986,  as  amended.  No
information or knowledge obtained in any investigation  pursuant to this Section
6.1 shall affect or be deemed to modify any representation or warranty contained
herein or the  conditions to the  obligations  of the parties to consummate  the
Acquisition.

         6.2  Confidentiality.  Each of the parties hereto hereby agrees to keep
such information or knowledge obtained pursuant to the negotiation and execution
of this  Agreement and the Exhibits,  or the  effectuation  of the  transactions
contemplated  hereby and  thereby,  confidential;  provided,  however,  that the
foregoing  shall not apply to  information  or  knowledge  which (a) a party can
demonstrate  was already  lawfully  in its  possession  prior to the  disclosure
thereof by the other party, (b) is or becomes  generally known to the public and
did not become so known  through any  violation of law or this  Agreement by the
non-disclosing  party,  (c) is later lawfully  acquired by such party from other
sources,  (d) is required to be disclosed by order of court or government agency
after seeking any reasonably  available protection against general disclosure or
(e) which is  disclosed  in the  course  of any  litigation  between  any of the
parties  hereto;  it being  understood  that the parties may  disclose  relevant
information and knowledge to their respective  employees and agents on a need to
know basis,  provided that the parties cause such  employees and agents to treat
such information and knowledge confidentially.

         6.3 Expenses.  Whether or not the Acquisition is consummated,  all fees
and expenses  incurred in connection  with the  Acquisition  including,  without
limitation, all legal, accounting,  financial advisory, consulting and all other
fees and expenses of third parties  incurred by a party in  connection  with the
negotiation  and  effectuation of the terms and conditions of this Agreement and
the Exhibits and the transactions  contemplated hereby and thereby, shall be the
obligation of the respective party incurring such fees and expenses.

         6.4  Public  Disclosure.  Unless  otherwise  required  by  law  or  any
applicable  rule of a stock  exchange or  quotation  system upon which a party's
securities are listed,  prior to the Closing Date, no disclosure (whether or not
in response to an inquiry) of the subject matter of this Agreement shall be made
by any party  hereto  unless  approved  by Buyer and  Seller  prior to  release;
provided  that such  approval  shall not be  unreasonably  withheld,  subject to
Buyer's and Seller's obligation to comply with applicable securities laws.

         6.5 Best Efforts.  Subject to the terms and conditions provided in this
Agreement and to the fiduciary  duties of the board of directors of Seller under
applicable  law as advised by counsel,  each of the parties hereto shall use its
commercially reasonable best efforts to take promptly, or cause to be taken, all
actions, and to do promptly,  or cause to be done, all things necessary,  proper
or advisable  under  applicable  laws and  regulations  to  consummate  and make
effective the transactions contemplated hereby, to obtain all necessary waivers,
consents and approvals and to effect all  necessary  registrations  and filings,
and to  remove  any  injunctions  or  other  impediments  or  delays,  legal  or
otherwise, in order to consummate



                                      -15-

<PAGE>



and make  effective  the  transactions  contemplated  by this  Agreement and the
Exhibits  for the  purpose  of  securing  to the  parties  hereto  the  benefits
contemplated by this Agreement and the Exhibits.

         6.6 Notification of Certain Matters. Seller shall give prompt notice to
Buyer,  and Buyer shall give prompt notice to Seller,  of (i) the  occurrence or
non-occurrence of any event, the occurrence or non-occurrence of which is likely
to cause any  representation  or  warranty  of  Seller  or Buyer,  respectively,
contained in this  Agreement or the  Exhibits to be untrue or  inaccurate  at or
prior to the Closing  Date and (ii) any failure of Seller or Buyer,  as the case
may be, to comply with or satisfy any  covenant,  condition  or  agreement to be
complied with or satisfied by it hereunder; provided, however, that the delivery
of any notice  pursuant to this Section 6.6 shall not limit or otherwise  affect
any remedies available to the party receiving such notice.

         6.7 Tax Returns.  Seller shall be responsible  for and pay when due all
of Seller's Taxes  attributable to or levied or imposed upon the Assets relating
or pertaining  to the period (or that portion of any period)  ending on or prior
to the Closing Date. Seller shall continue to timely file within the time period
for filing, or any extension  granted with respect thereto,  all of Seller's Tax
returns  required  to be filed in  connection  with the Assets  for all  periods
ending on or prior to the  Closing  Date and any portion of any such Tax returns
connected  therewith  shall be true and correct and completed in accordance with
applicable laws.

         Buyer shall be  responsible  for and pay when due (i) all of  Buyer's's
taxes  attributable  to or  levied  or  imposed  upon  the  Assets  relating  or
pertaining  to the period  (or that  portion of any  period)  beginning  the day
immediately  following  the  Closing  Date and (ii) all taxes  attributable  to,
levied or  imposed  upon,  or  incurred  in  connection  with  Buyer's  business
operations  immediately  following  the Closing  Date.  Buyer shall  timely file
within  the time  period for  filing,  or any  extension  granted  with  respect
thereto,  all of Buyer's Tax returns required to be filed in connection with the
Assets for all periods ending after the Closing Date and any portion of any such
Tax Returns  connected  therewith  shall be true and correct  and  completed  in
accordance with applicable laws.

         Federal and state income and  franchise  Taxes imposed on or in respect
of the Assets for any taxable  period that  includes  the Closing  Date shall be
allocated  to and paid by (i)  Seller  for the  period up to and  including  the
Closing Date, and (ii) Buyer for the period  subsequent to the Closing Date. For
purposes of this Agreement, Taxes for the period up to and including the Closing
Date and for the period subsequent to the Closing Date shall be apportioned on a
per diem basis in the case of any such Taxes not measured or measurable in whole
or in part with  reference to net or gross  income,  sales or receipts,  capital
expenses or compensation  expenses, and all other such Taxes shall be determined
on the basis of any interim  closing of the books of the Product  Line as of the
Closing Date.

         Seller and Buyer shall provide reasonable  cooperation to each other in
connection with (i) the  preparation or filing of any Tax return,  Tax election,
Tax  consent  or  certification,  or  any  claim  for a  Tax  refund,  (ii)  any
determination of liability of Taxes,  and (iii) any audit,  examination or other
proceeding  in  respect  of Taxes  related  to the  Assets or the  operation  or
activities of the Assets.

         6.8  Post-Closing  Employment  of  Transitioned  Employees.  Except  as
otherwise provided in the Secondment Agreement (as defined below),  Seller shall
terminate  each  employee  listed  on  Exhibit  D on  and as of  the  date  (the
"Departure Date") Buyer moves such employees out of the premises of Seller



                                      -16-

<PAGE>



that Buyer will be given access to Seller  pursuant to the  Transition  Services
Agreement (defined in Section 6.11 below). At the Closing Date, Buyer and Seller
shall execute a Secondment  Agreement in the form substantially  attached hereto
as Exhibit E (the  "Secondment  Agreement")  providing that Buyer will reimburse
Seller for the compensation  paid to such employees,  and other costs associated
with Seller's  employment of such  employees,  from the Closing Date to the date
the Secondment Agreement will terminate with respect to each such employee. Such
Secondment  Agreement  will provide for payroll  payments  and other  associated
costs by the Seller,  on behalf of the Buyer,  to each employee  being  seconded
pursuant to the  Secondment  Agreement,  for which the Buyer will  reimburse the
Seller in full within thirty (30) days of receipt from the Seller of a statement
detailing  all such  payments  and costs.  Upon the Closing Date the Buyer shall
make  employment  offers (the  "Employment  Offers") to each employee  listed on
Exhibit D in the Buyer's  standard form. Each such Employment  Offer will become
effective  upon the  termination of the Secondment  Agreement.  Each  employment
offer by the Buyer to each  such  employee,  shall be on an "at will"  basis and
subject to Buyer's terms, conditions and policies of employment, if any. Nothing
contained in this Section is intended or shall be deemed to (a) require Buyer to
employ such persons for any fixed or pre-determined  time after the Closing,  or
(b) confer upon any employee of Seller,  past, present, or future, any rights of
employment of any nature,  it being understood and agreed that the provisions of
this Section are intended to set forth an agreement among Buyer and Seller,  and
are not intended to benefit any persons not party to this  Agreement,  including
such employees.  Such Employees who become employees of Buyer (the "Transitioned
Employees")  shall be  given a  year-of-service  level  ("Service  Credit")  for
purposes of Buyer's benefits that gives such Employees credit for all service on
the  NetLOCK  Product  Line for  purposes  of  vesting  and  eligibility  in any
compensation  or benefit  plan,  program,  or  arrangement  of Buyer,  except as
prohibited by applicable  federal and state laws and regulations;  provided that
no Employee will be given such Service Credit for any period prior to January 1,
1995,  and Employees  hired after  January 1, 1995 will be given Service  Credit
from their date of hire.

         6.9      Employee Benefits.

                  (a) With  respect to the rights of  Transitioned  Employees to
accrued  vacation and other  approved  leave prior to the  Departure  Date,  the
Seller  shall pay such  Transitioned  Employees  the  value of all such  accrued
rights in cash within three (3) business  days of the  Departure  Date,  or such
shorter  period  as  required  by law.  Effective  upon (i)  execution  of their
respective  Employment  Offers and (ii) the  Departure  Date,  the  Transitioned
Employees shall be permitted to participate in all current Buyer benefit, bonus,
profit  sharing,  welfare and similar plans  available to all other employees of
Buyer on the terms and conditions provided in such plans. Transitioned Employees
and their  dependents  shall be  immediately  eligible for any welfare  benefits
provided by the Buyer,  and all otherwise  applicable  pre-existing  conditions,
exceptions,  exclusionary  provisions,  and  waiting  periods  shall be  waived;
provided,  however,  (i) that stock options  granted to the  Employees  shall be
subject to the standard vesting  provisions  applicable to options granted under
Buyer's  Stock  Option  Plan,  and (ii) that the  Employees  will not be able to
enroll in the Buyer's Employee Stock Purchase Plan or 401(k) Plan until the open
enrollment  period  following  their being hired as an Employee of Buyer. In the
period  between the date the parties enter into this Agreement and the Departure
Date,  the Seller's  benefit  plans shall remain in effect for the  Transitioned
Employees, to the extent possible under the terms of such plans.

         6.10 Additional Documents and Further Assurances. Each party hereto, at
the reasonable  request of another party hereto,  shall execute and deliver such
other instruments and do and perform such



                                      -17-

<PAGE>



other acts and things as may be reasonably  necessary or desirable for effecting
completely the consummation of this Agreement and the transactions  contemplated
hereby.

         6.11  Post-Closing  Operation of Product Line on Seller's  Premises and
with the Use of Certain of Seller's Equipment. Seller hereby consents to the use
by Buyer of Seller's premises and any of Seller's  equipment that is not part of
the Equipment  that is (and for the past six months has been) used in connection
with the Product Line to operate the Product Line post-Closing for a period (the
"Transition  Period") not to exceed thirty (30) days. In addition,  Seller shall
provide  those  services and equipment  required to operate the NetLOCK  product
line during the Transition  Period under an agreement to be executed between the
Buyer and the Seller (the "Transitional Services Agreement"), prior to or on the
Closing Date, substantially in the form attached hereto as Exhibit F. The Seller
will  provide  the  services  and  equipment  under  the  Transitional  Services
Agreement  at a  specified  rate and will  invoice  the Buyer  monthly  for such
Seller's  expenses under the Transitional  Services  Agreement,  which the Buyer
will reimburse the Seller for within thirty (30) of receipt of such invoice.

         6.12 Financial Information.  The Seller,  recognizing the possible need
by the Buyer to prepare  audited  financial  statements for the NetLOCK  product
line for up to the three  fiscal years prior to the Closing  Date,  will use its
best  efforts to provide  the Buyer,  at Buyer's  request,  with such  financial
information,  including internal financial reports,  payroll reports,  and other
relevant financial  documents,  in Seller's  possession  relating to the Product
Line as well as  access  to the  Seller's  accountants  or other  accounting  or
financial personnel who prepared such reports or statements; provided that after
three months after the Closing Date,  Seller shall have no  obligations  to make
such personnel  available if such personnel are no longer employed by Seller (or
any  subsidiary or successor of Seller).  Seller shall  preserve such  financial
records in accordance with its standard record retention  policies and practices
provided that such information  shall be preserved for a period of 4 years after
the Closing Date.

         6.13 Seller's  Cooperation  on Obtaining  Additional  Consents.  Seller
covenants to use its best efforts to obtain the consents  necessary to assign to
Buyer the  agreements  between the Seller and Helix Software  Company,  Inc. and
between the Seller and Volt Delta Resources Inc.


                                   ARTICLE VII

                            SURVIVAL; INDEMNIFICATION

         7.1      Indemnification.

                  (a)  Indemnification by Seller.  Subject to the qualifications
and limitations in this Section 7.1, if the Closing is consummated, Seller shall
indemnify  and defend and hold Buyer,  its  subsidiaries,  directors,  officers,
agents,  and other affiliates  harmless against and with respect to, any and all
Damages  (as  defined  in  subsection  7.1(c)  below)  incurred  by  Buyer,  its
subsidiaries, directors, officers, agents or other affiliates as a result of any
of the following:

                        (i) any inaccuracy or misrepresentation in, or breach of
any  representation  or  warranty of Seller in,  this  Agreement  or the related
documents  executed and  delivered by Seller in connection  with this  Agreement
(the "Operative Documents");



                                      -18-

<PAGE>



                        (ii) any breach or  failure by Seller to perform  any of
its covenants or agreements  under this Agreement or any of the other  Operative
Documents;

                        (iii) any liability not expressly being assumed by Buyer
hereunder,  any  Excluded  Asset or the  non-compliance  by the parties with the
provisions  of  Article  6 of  the  Uniform  Commercial  Code  of the  State  of
California,  if applicable,  or with any similar  applicable  article or section
under the Uniform Commercial Code or other similar applicable law enacted in any
other jurisdiction in which any of the Assets is located; and

                        (iv) any  liability  or  obligation  with respect to the
operation of the Product Line arising (A) under applicable  environmental  laws,
rules or  regulations  with  respect to acts  occurring  or taken or  conditions
existing on or prior to the Closing Date, (B) under  applicable tax laws,  rules
or regulations with respect to acts occurring or taken or conditions existing on
or prior to the Closing Date  (including any tax assessed by virtue of successor
liability  by  any  governmental  agency),  or  (C)  from  the  infringement  of
intellectual  property  rights of others  with  respect to  products  shipped or
services  provided to third  parties  prior to the  Closing  Date by the Product
Line.

                  (b)  Indemnification  by Buyer.  Subject to the qualifications
and limitations in this Section 7.1, if the Closing is consummated,  Buyer shall
indemnify and defend and hold Seller and its directors,  officers,  agents,  and
other  affiliates  harmless against and with respect to, any and all Damages (as
defined in subsection  7.1(c) below) incurred by Seller or any of its directors,
officers, agents or other affiliates as a result of any of the following:

                        (i) any inaccuracy or misrepresentation in, or breach of
any representation or warranty of Buyer in this Agreement or the other Operative
Documents;

                        (ii) any breach or  failure  by Buyer to perform  any of
its covenants or agreements  under this Agreement or any of the other  Operative
Documents;

                        (iii) the  operation or ownership of the Product Line or
the Assets from and after the Closing Date,  including (A) the use of any of the
Assets at, or the removal of any of the Assets from,  any real property owned by
Seller or its affiliates,  and (B) any liability or obligation  under applicable
environmental  laws,  rules  or  regulations  caused  directly  by the  acts  or
omissions of persons acting on behalf of Buyer, whether with respect to Sellers'
premises or otherwise; and

                        (iv) any Assumed Obligation.

                  (c) Damages. For purposes of this Section 7.1, "Damages" means
all  demands,  claims,  claims for  reimbursement,  actions or causes of action,
assessments,  losses,  damages,  costs,  expenses,  liabilities,   deficiencies,
judgments,  awards,  fines,  sanctions,  penalties,  charges and amounts paid in
settlement,  whether civil, criminal or administrative in nature,  including the
reasonable  costs,  fees  and  expenses  of  attorneys,   experts,  accountants,
appraisers, consultants, witnesses, investigators and agents and all such costs,
fees and  expenses  incurred in  defending  against any of the  foregoing  or in
enforcing this Agreement.  Notwithstanding the foregoing  definition,  when used
with  reference  to  amounts  recoverable  as  the  result  of any  breach  of a
representation,  warranty or covenant  contained in this  Agreement or any other
Operative Document, Damages shall not include amounts recoverable solely as



                                      -19-

<PAGE>



lost profits,  incidental damages,  indirect damages, special damages,  punitive
damages or consequential damages.

                  (d)   Procedure   for   Indemnification.   The  procedure  for
indemnification shall be as follows:

                        (i)  The  party  claiming  indemnification  ("Claimant")
shall,  within  thirty  (30)  days  after its  discovery  of any claim for which
indemnification will be sought as provided in this Agreement (the "Claim"), give
notice to the party from whom  indemnification  is sought  ("Indemnitor") of its
Claim,  specifying in reasonable  detail the factual basis for the Claim and, to
the extent known, the amount of the Claim.  Notwithstanding  the foregoing,  the
failure by Claimant to provide notice of any Claim within the period  specified,
or any  delay  in  providing  such  notice,  shall  not  affect  or  impair  the
obligations  of  Indemnitor  hereunder,  except  and  only  to the  extent  that
Indemnitor has been adversely affected by such failure or delay.

                        (ii)  With  respect  to  Claims   between  the  parties,
following  receipt of notice  from  Claimant of a Claim,  Indemnitor  shall have
sixty (60) days to make any  investigation  of the Claim that  Indemnitor  deems
necessary or desirable.  For purposes of this investigation,  Claimant agrees to
make available to Indemnitor and its authorized  representatives the information
relied upon by Claimant to  substantiate  the Claim.  If Claimant and Indemnitor
cannot  agree as to the  validity  and amount of the Claim within the sixty (60)
day period (or any mutually  agreed upon extension  thereof),  Claimant may seek
appropriate legal remedy, subject to the provisions of Section 7.3.

                        (iii) With  respect to any Claim by a third  party as to
which Claimant is entitled to indemnification  hereunder,  Indemnitor shall have
the  right,  exercisable  by  written  notice to  Claimant  within 30 days after
receipt of written notice from Claimant of the  commencement or assertion of any
such  Claim,  at its own  expense  to  participate  in or assume  control of the
defense  of the Claim,  and  Claimant  shall  cooperate  fully with  Indemnitor,
subject to reimbursement for actual out-of-pocket  expenses incurred by Claimant
the  result of a request  by the  Indemnitor.  If  Indemnitor  does not elect to
assume control or otherwise  participate in the defense of any third party Claim
within  thirty (30) days of its receipt of notice of the Claim (or any  extended
period  mutually  agreed upon by the  parties),  Claimant  shall  (upon  further
written  notice  to  Indemnitor)  have  the  right  to  undertake  the  defense,
compromise or  settlement of the Claim for the account of Indemnitor  subject to
the right of Indemnitor,  at its expense,  to assume the defense of the Claim at
any time prior to final settlement,  compromise or determination  thereof. In no
event shall  Indemnitor be liable or otherwise have any obligation  with respect
to any  settlement,  compromise  or  determination  of any  Claim  agreed  to by
Claimant  without the prior written  consent of  Indemnitor  (which shall not be
withheld unreasonably).

                        (iv) The parties shall  cooperate in defending any third
party Claim, and the defending party shall have reasonable  access to the books,
records  and  personnel  which are  pertinent  to the  defense  and which are in
control  of the  other  party.  The  parties  agree  to  furnish  such  records,
information and testimony,  and attend such conferences,  discovery proceedings,
hearings,  trials and appeals, as may be reasonably requested by the other party
in connection with defending any third party Claim.



                                      -20-

<PAGE>



                  (e) Limitations and Conditions  Applicable to Buyer. The right
of Buyer to obtain  indemnification  from Seller  pursuant to Section  7.1(a) of
this Agreement is subject to the following limitations:

                        (i) Buyer shall not be entitled to indemnification  from
Seller  pursuant to Section 7.1(a) until the aggregate  Damages for which Seller
is liable under Section 7.1(a) exceed $50,000, whereupon Buyer shall be entitled
to indemnification by Seller for all such Damages.

                        (ii) Buyer shall not be entitled to indemnification from
Seller  pursuant to Section 7.1(a) for that amount of its aggregate  Damages for
which Seller is liable under Section 7.1(a) which is in excess of $1,000,000.

                        (iii) No Claim shall be brought by Buyer against  Seller
under  Section  7.1(a)  unless  notice in writing of such Claim  shall have been
given to  Seller  on or prior to 5:00 p.m.  Pacific  Standard  Time on the first
anniversary of the Closing Date, but Claims may be brought  against Seller as to
any Damages  (or a potential  claim by an  appropriate  party)  asserted in good
faith prior to such date.

                        (iv)  Seller  shall not be  liable  for  Damages  to the
extent that the Damages arise from a change in the accounting or Tax policies or
practices of Buyer after the Closing Date.

                        (v) Buyer shall not be  entitled  to recover  Damages in
respect of any Claim or otherwise obtain  reimbursement or restitution more than
once with respect to any claim hereunder.

                  (f) Limitations and Conditions Applicable to Seller. The right
of Seller to obtain  indemnification  from Buyer  pursuant to Section  7.1(b) of
this Agreement is subject to the following limitations:

                        (i) Seller shall not be entitled to indemnification from
Buyer pursuant to Section 7.1(b) until the aggregate  Damages for which Buyer is
liable under Section 7.1(b) exceed $50,000,  whereupon  Seller shall be entitled
to indemnification by Buyer for all such Damages;  provided,  however,  that the
above limitation shall not apply as to Damages arising from failure by the Buyer
to pay Royalties under ss.1.2(b) hereunder.

                        (ii) Seller  shall not be  entitled  to  indemnification
from Buyer pursuant to Section  7.1(b) for that amount of its aggregate  Damages
for which Buyer is liable under Section 7.1(b) which is in excess of $1,000,000;
provided,  however,  that the above  limitation  shall  not apply as to  Damages
arising from failure by the Buyer to pay Royalties under ss.1.2(b) hereunder.

                        (iii) No Claim shall be brought by Seller  against Buyer
under  Section  7.1(b)  unless  notice in writing of such Claim  shall have been
given  to Buyer on or prior to 5:00  p.m.  Pacific  Standard  Time on the  first
anniversary of the Closing Date,  but Claims may be brought  against Buyer as to
any Damages  (or a potential  claim by an  appropriate  party)  asserted in good
faith prior to such date; provided, however, that the above limitation shall not
apply as to Damages  arising  from failure by the Buyer to pay  Royalties  under
ss.1.2(b) hereunder.



                                      -21-

<PAGE>



                        (iv) Seller shall not be entitled to recover  Damages in
respect of any Claim or otherwise obtain  reimbursement or restitution more than
once with respect to any claim hereunder.

                  (g) Remedies Exclusive.  The remedies provided in this Section
7.1 shall be exclusive  as to any Claims by a party under this  Agreement or any
other Operative Document or arising out of the transactions  provided for herein
and therein and shall preclude assertion by any party of any other rights or the
seeking of any other remedies  against another party;  provided,  however,  that
nothing in this Section 7.1(g) shall limit rights or remedies expressly provided
for in this Agreement or any other  Operative  Document,  rights or remedies for
fraud, deceit, or intentional non-disclosure,  or rights or remedies which, as a
matter of applicable law or public policy, cannot be limited or waived.

                  (h)  Interpretation.  Solely for purposes of this Section 7.1,
the existence and extent of any breach of any  representation  or warranty under
Article II and Article III  referred  to in Section  7(a)(i) or Section  7(b)(i)
shall be  determined  by  reading  such  representation  or  warranty  as if all
materiality  standards  contained  in such  representation  or  warranty  (i.e.,
without reference to the qualifier  "material,"  "materially,"  "material to the
Business as a whole," "in all  material  aspects,"  "in any  material  respect,"
"Material  Adverse  Effect" or similar  qualifiers),  has been deleted from such
representation or warranty in its entirety.

         7.2  Arbitration.  Any controversy  involving a claim by an indemnified
party  pursuant to this Article VII shall be finally  settled by  arbitration in
Santa  Clara,   California  in  accordance  with  the  then  current  Commercial
Arbitration Rules of the American Arbitration Association; and judgment upon the
award rendered by the arbitrator may be entered in any court having jurisdiction
thereof.  Such arbitration  shall be conducted by an arbitrator chosen by mutual
agreement of Buyer and Seller. Failing such agreement,  the arbitration shall be
conducted  by  three  independent  arbitrators,  none of  whom  shall  have  any
competitive  interests  with  Buyer  or  Seller.  Buyer  shall  choose  one such
arbitrator,  Seller shall choose one such  arbitrator,  and such two arbitrators
shall mutually select a third  arbitrator.  Any decision of two such arbitrators
shall be binding  on Buyer and  Seller.  Each party  shall pay its own costs and
expenses  (including  counsel  fees) of any  such  arbitration  except  that the
arbitrator  can compel  one party to pay all or a portion  of the other  party's
costs and expenses.


                                  ARTICLE VIII

                          CONDITIONS TO THE ACQUISITION

         8.1 Conditions to Obligations of Each Party to Effect the  Acquisition.
The  respective  obligations  of each  party to this  Agreement  to  effect  the
Acquisition shall be subject to the satisfaction at or prior to the Closing Date
of the following conditions:

                  (a) No  Injunctions or  Restraints;  Illegality.  No temporary
restraining order,  preliminary or permanent injunction or other order issued by
any court of competent  jurisdiction  or other legal  restraint  or  prohibition
preventing the consummation of the Acquisition shall be in effect, nor shall any
proceeding   brought  by  an  administrative   agency  or  commission  or  other
governmental authority or instrumentality,  domestic or foreign,  seeking any of
the foregoing be pending; nor shall there be any



                                      -22-

<PAGE>



action  taken,  or any statute,  rule,  regulation  or order  enacted,  entered,
enforced or deemed  applicable to the Acquisition,  which makes the consummation
of the Acquisition illegal.

                  (b)  Raytheon  Approval.  The oral or written  approval by the
Raytheon  Company of all of the material  terms of this Agreement and any of the
transactions contemplated thereby including the execution of the other Operative
Agreements.

         8.2 Additional  Conditions to Obligations of Seller. The obligations of
Seller  to  consummate  and  effect  this  Agreement  and the  Exhibits  and the
transactions   contemplated   hereby  and  thereby   shall  be  subject  to  the
satisfaction  at or  prior  to  the  Closing  Date  of  each  of  the  following
conditions, any of which may be waived, in writing, exclusively by Seller:

                  (a)   Representations,    Warranties   and   Covenants.    The
representations  and  warranties  of Buyer in this  Agreement  shall be true and
correct in all  material  respects  (without  giving  duplicative  effect to any
materiality  standard contained in the terms of such representation or warranty)
on and as of the Closing Date as though such representations and warranties were
made on and as of such time and Buyer shall have performed and complied with all
covenants,  obligations  and  conditions  of this  Agreement  and  the  Exhibits
required to be performed and complied with by it as of the Closing Date.

                  (b) Certificate of Buyer. Seller shall have been provided with
a  certificate  in a form  mutually  acceptable to both parties duly executed on
behalf of Buyer to the effect that, as of the Closing Date:

                        (i) all  representations and warranties made by Buyer in
this  Agreement are true and correct in all material  respects  (without  giving
duplicative  effect to any materiality  standard  contained in the terms of such
representation or warranty); and

                        (ii) all covenants,  obligations  and conditions of this
Agreement  to be  performed  by  Buyer  on or  before  such  date  have  been so
performed.

                  (c) Claims.  There shall not have occurred any written  claims
or threatened  litigation  against Buyer (whether or not asserted in litigation)
which would  reasonably  be  expected to  materially  and  adversely  affect the
consummation of the transactions contemplated hereby.

                  (d) No Material Adverse Changes. There shall not have occurred
any  material  adverse  change  in the  financial  condition  of  Buyer  and its
subsidiaries taken as a whole.

                  (e) Mentat  Settlement.  Seller and Mentat  shall have entered
into a  settlement  agreement  settling  their  dispute  regarding  the  license
agreement executed by them.

         8.3 Additional  Conditions to the Obligations of Buyer. The obligations
of  Buyer  to  consummate  and  effect  this  Agreement  and  the   transactions
contemplated  hereby  shall be  subject to the  satisfaction  at or prior to the
Closing Date of each of the following conditions, any of which may be waived, in
writing, exclusively by Buyer:



                                      -23-

<PAGE>



                  (a)   Representations,    Warranties   and   Covenants.    The
representations and warranties of the Seller in this Agreement shall be true and
correct in all  material  respects  (without  giving  duplicative  effect to any
materiality  standard contained in the terms of such representation or warranty)
on and as of the Closing Date as though such representations and warranties were
made on and as of such time and the Seller  shall have  performed  and  complied
with all covenants,  obligations and conditions of this Agreement required to be
performed and complied with by them as of the Closing Date.

                  (b) Certificate of Seller. Buyer shall have been provided with
a certificate in a form mutually  acceptable to both parties  executed by and on
behalf of Seller to the effect that, as of the Closing Date:

                        (i) all representations and warranties made by Seller in
this  Agreement are true and correct in all material  respects  (without  giving
duplicative  effect to any materiality  standard  contained in the terms of such
representation or warranty); and

                        (ii) all covenants,  obligations  and conditions of this
Agreement  to be  performed  by  Seller  on or  before  such  date  have been so
performed.

                  (c)  Claims.  There  shall  not have  occurred  any  claims or
threatened  litigation  against  Seller  (whether or not asserted in litigation)
which would  reasonably  be  expected to  materially  and  adversely  affect the
consummation  of  the  transactions  contemplated  hereby,  the  Assets  or  the
Business.

                  (d) No  Injunctions  or Restraints on Conduct of Business.  No
temporary restraining order,  preliminary or permanent injunction or other order
issued by any  court of  competent  jurisdiction  or other  legal or  regulatory
restraint or provision  challenging Buyer's proposed  acquisition of the Assets,
or limiting or restricting  Buyer's conduct or operation of any business related
to the  Assets  (or its own  business)  following  the  Acquisition  shall be in
effect,  nor  shall  any  proceeding  brought  by an  administrative  agency  or
commission  or other  governmental  authority  or  instrumentality,  domestic or
foreign, seeking any of the foregoing be pending.

                  (e) No Material Adverse Changes. There shall not have occurred
any Material Adverse Effect in the Assets or the Product Line.

                  (f) Third Party Rights. No third party shall have any right of
any  nature  whatsoever  (including,  without  limitation,  any right to receive
royalty  payments) in respect of any of the Assets,  other than as  specifically
set forth in the Disclosure Schedule.

                  (g)  Employment,   Invention  Assignment  and  Confidentiality
Agreements.  Buyer and each of the New Employees  listed on Exhibit D shall each
have   agreed  to  enter   into  an   Employment,   Invention   Assignment   and
Confidentiality  Agreement on substantially  the terms set forth in Exhibit G to
become effective when the individuals listed on Exhibit D shall become employees
of the Company.

                  (h) Third-Party  Consents.  All  third-party  consents for the
Contracts  listed  under  Assumed  Obligations  in  Exhibit  A shall  have  been
obtained,  except for Seller's  distribution license and bundling agreement with
Helix Software  Company,  Inc. and Seller's  services  agreement with Volt Delta
Resources Inc.



                                      -24-

<PAGE>



                  (i) Mentat Agreement.  Buyer shall have entered into a written
agreement with Mentat regarding software development.

                  (j)  Employees.  The  employees of Seller  listed on Exhibit D
shall  accept  offers of at-will  employment  with Buyer,  which will include an
agreement  to sign the  Employment,  Invention  Assignment  and  Confidentiality
Agreement.

                  (k) Transitional  Services Agreement and Secondment Agreement.
Buyer and Seller shall enter into the  Transitional  Services  Agreement and the
Secondment  Agreement  substantially in the forms set forth in Exhibits E and F,
respectively.


                                   ARTICLE IX

                        TERMINATION, AMENDMENT AND WAIVER

         9.1  Termination.  Except as  provided  below,  this  Agreement  may be
terminated and the Acquisition abandoned at any time prior to the Closing Date:

                  (a)      by mutual consent of Seller and Buyer;

                  (b) by Buyer or Seller if: (i) the Closing has not occurred by
September 19, 1997; (ii) there shall be a final nonappealable order of a federal
or state court in effect  preventing  consummation of the Acquisition;  or (iii)
there shall be any statute,  rule,  regulation or order enacted,  promulgated or
issued or deemed  applicable to the Acquisition by any Governmental  Entity that
would make consummation of the Acquisition illegal; and

                  (c) by Buyer  if  there  shall  be any  action  taken,  or any
statute,  rule,  regulation or order  enacted,  promulgated  or issued or deemed
applicable to the  Acquisition  by any  Governmental  Entity,  which would:  (i)
prohibit Buyer's ownership of the Assets or operation of all or a portion of the
Product  Line or (ii)  compel  Buyer to  dispose  of or hold  separate  all or a
portion of the Assets,  the Product Line or other  businesses or assets of Buyer
as a result of the Acquisition.

         9.2  Effect  of  Termination.  In the  event  of  termination  of  this
Agreement as provided  above,  this Agreement  shall  forthwith  become void and
there shall be no liability  or  obligation  on the part of Buyer or Seller,  or
their respective officers,  directors,  stockholders or equity owners,  provided
that each party shall remain liable for any breaches of this Agreement  prior to
its termination;  and provided further that, the provisions of Sections 6.2, 6.3
and 6.4 of this Agreement  shall remain in full force and effect and survive any
termination of this Agreement.

        9.3  Amendment.  This  Agreement may be amended by the parties hereto at
any time only by execution of an instrument  in writing  signed on behalf of the
Buyer and the Seller.



                                      -25-

<PAGE>



         9.4 Extension;  Waiver. At any time prior to the Closing Date, Buyer on
the one hand, and Seller, on the other, may, to the extent legally allowed,  (i)
extend the time for the performance of any of the obligations of the other party
hereto,  (ii) waive any inaccuracies in the  representations and warranties made
to such party contained herein or in any document delivered pursuant hereto, and
(iii) waive  compliance with any of the agreements or conditions for the benefit
of such party contained  herein.  Any agreement on the part of a party hereto to
any such  extension or waiver shall be valid only if set forth in an  instrument
in writing signed on behalf of such party.


                                    ARTICLE X

                               GENERAL PROVISIONS

         10.1 Survival of Representations  and Warranties.  All  representations
and  warranties  made by any party in the Agreement or in any document  executed
and delivered hereunder (an "Operative Document") shall survive the Closing, but
all claims made after the Closing with respect to any such  representations  and
warranties  shall be made under,  and subject to the  limitations  set forth in,
Section 7.1,  except as otherwise set forth in Section 7.1(g) which shall be the
exclusive remedy after Closing for any such claim.

         10.2  Exclusion  of  other  Representations.  Each  party  has made its
decision  to enter  into  this  Agreement  and to  consummate  the  transactions
provided for herein without relying upon any express or implied representations,
warranties,  commitments  or  undertakings  of any other  party,  or such  other
party's directors,  officers, employees, agents,  representatives or affiliates,
except as expressly set forth in this Agreement and in the Operative Documents.

         10.3  Knowledge.  "Knowledge"  means such knowledge that the executives
and managers of the Product Line, as identified on the attached  Schedule  10.3,
have or should  have or Seller has or should  have,  in the  ordinary  course of
business.

         10.4 Notices. All notices and other  communications  hereunder shall be
in writing and shall be deemed given if delivered  personally  or by  commercial
delivery  service,  or on the  third  business  day after  mailing  if mailed by
registered  or  certified  mail  (return  receipt  requested)  or on the  day of
transmission if sent via telecopy (with acknowledgment of complete transmission)
to the parties at the following  addresses (or at such other address for a party
as shall be specified by like notice):

                  (a)      if to Buyer, to:

                           Interlink Computer Sciences, Inc.
                           47370 Fremont Boulevard
                           Fremont, California 94538
                           Attention:  Ms. Gloria M. Purdy
                           Telephone No.:  (510) 657-9800
                           Telecopy No.: (510) 659-6381



                                      -26-

<PAGE>



                           with a copy to:

                           Wilson Sonsini Goodrich & Rosati
                           Professional Corporation
                           650 Page Mill Road
                           Palo Alto, California 94304
                           Attention:  Thomas C. DeFilipps, Esq.
                           Telephone No.:  (650) 493-9300
                           Telecopy No.:  (650) 493-6811

                  (b)      if to Sellers, to:

                           Hughes Aircraft Company
                           1100 Wilson Blvd., Ste. 2000
                           Arlington, VA  22209
                           Attention:  Charles S. Ream
                           Telephone No.:  (703) 284-4293
                           Telecopy No.:  (703) 528-3706

                           with a copy to:

                           Honigman Miller Schwartz and Cohn
                           2290  First National Building
                           Detroit, Michigan 48226
                           Attention:  Norman H. Beitner, Esq.
                           Telephone No.:  (313) 256-7800
                           Telecopy No.:  (313) 962-0176

                           and

                           Hughes Electronics Corporation
                           7200 Hughes Terrace
                           Los Angeles, CA  90080-0028
                           Attn:  Office of the General Counsel
                           Telephone No.:  (310) 568-7272
                           Telecopy No.:  (310) 568-7834

         10.5  Interpretation.  When a reference  is made in this  Agreement  to
Exhibits or Schedules, such reference shall be to an Exhibit or Schedule to this
Agreement  unless  otherwise  indicated.  References to "this Agreement" or "the
Agreement" shall mean the Agreement  including all Exhibits and Schedules unless
otherwise provided herein. The words "include,"  "includes" and "including" when
used herein  shall be deemed in each case to be  followed by the words  "without
limitation." The table of contents and headings  contained in this Agreement are
for  reference  purposes  only and shall not  affect in any way the  meaning  or
interpretation of this Agreement.



                                      -27-

<PAGE>



         10.6  Counterparts.  This  Agreement  may be  executed  in one or  more
counterparts,  all of which shall be considered  one and the same  agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and  delivered  to the other  party,  it being  understood  that all
parties need not sign the same counterpart.

         10.7 Entire Agreement.  This Agreement and the Exhibits hereto, each of
which is hereby  incorporated  into this  Agreement and made a part hereof:  (a)
constitute  the entire  agreement  among the parties with respect to the subject
matter  hereof and  supersede  all prior  agreements  and  understandings,  both
written and oral,  among the parties with respect to the subject  matter hereof;
(b) are not  intended  to confer  upon any other  person any rights or  remedies
hereunder, unless expressly provided otherwise.

         10.8  Assignment.  This Agreement shall not be assigned by operation of
law (except in connection with a change in the  jurisdiction of incorporation of
the  Buyer or the  proposed  merger of Seller  or its  affiliate  with  Raytheon
Company) or otherwise except as otherwise specifically  provided;  provided that
after the  Closing,  any  rights or  obligations  of the Buyer can be  assigned,
without the consent of Seller, to any entity acquiring at least fifty percent of
the voting control of Buyer in any one or series of transactions,  or any entity
acquiring all or substantially all of Buyer's assets.

         10.9 Severability. In the event that any provision of this Agreement or
the  application  thereof  becomes  or  is  declared  by a  court  of  competent
jurisdiction  to be  illegal,  void  or  unenforceable,  the  remainder  of this
Agreement  will  continue in full force and effect and the  application  of such
provision to other persons or circumstances will be interpreted so as reasonably
to effect the intent of the parties hereto. The parties further agree to replace
such  void or  unenforceable  provision  of  this  Agreement  with a  valid  and
enforceable  provision (including,  if applicable,  one that limits the scope or
duration of the covenants  contained  herein) that will  achieve,  to the extent
possible,   the  economic,   business  and  other   purposes  of  such  void  or
unenforceable provision.

         10.10 Governing Law; Jurisdiction.  This Agreement shall be governed by
and construed in accordance with the laws of the State of California, regardless
of the laws that might otherwise govern under applicable principles of conflicts
of laws. Except as expressly provided  elsewhere in this Agreement,  the parties
hereto agree that the federal or state courts in the State of  California  shall
be the exclusive jurisdiction for all disputes.

         10.11 Rules of  Construction.  The parties  hereto agree that they have
been  represented  by  counsel  during the  negotiation  and  execution  of this
Agreement and, therefore, waive the application of any law, regulation,  holding
or rule of  construction  providing  that  ambiguities  in an agreement or other
document  will be  construed  against  the  party  drafting  such  agreement  or
document.



                  [Remainder of Page Left Intentionally Blank]



                                      -28-

<PAGE>



         IN WITNESS  WHEREOF,  Buyer and Seller have caused this Agreement to be
signed by or their duly authorized respective officers, all as of the date first
written above.

                                               "BUYER"

                                               INTERLINK COMPUTER SCIENCES, INC.


                                               By: /s/ Barbara Booth
                                                   -----------------------------

                                               Name: Barbara Booth
                                                     ---------------------------

                                               Title: Vice President
                                                      --------------------------


                                               "SELLER"

                                               HUGHES AIRCRAFT COMPANY

                                               By: /s/ Charles S. Ream
                                                   -----------------------------

                                               Name: Charles S. Ream
                                                     ---------------------------

                                               Title: Sr. Vice President and CFO
                                                      --------------------------










 [Signature Page to Interlink Computer Sciences, Inc. Asset Purchase Agreement]


                           SOFTWARE LICENSE AGREEMENT

         THIS  AGREEMENT  is  made  and  entered  into  as of  the  17th  day of
September,   1997  ("Agreement")  by  and  between  MENTAT  INC.,  a  California
corporation having a place of business at Los Angeles,  California  (hereinafter
called "MENTAT"),  and INTERLINK COMPUTER SCIENCES, INC., a Delaware corporation
having  a  place  of  business  at  Fremont,   California   (hereinafter  called
"INTERLINK").

         WHEREAS,  MENTAT is engaged in the  design and  development  of certain
technology  related to  software  interfaces  for  operating  systems  including
communications  stacks,  and has developed and acquired a substantial  amount of
know-how,  trade  secrets,  technical  data  and  information  relating  to such
technology;

         WHEREAS,   INTERLINK  has  acquired  certain   technology   related  to
information  security,   including  a  product  which  provides  secure  network
communications  known  as the  NetLOCK  Software  (defined  below)  from  Hughes
Aircraft Company;

         WHEREAS,  MENTAT has developed software  interfaces for use in enabling
the NetLOCK Software to communicate with different operating systems;

         WHEREAS,  MENTAT has licensed to Hughes  Aircraft  Company the right to
use the MENTAT software interfaces in the field of information security; and

         WHEREAS,  MENTAT  and  INTERLINK  wish  to  set  forth  the  terms  and
conditions under which MENTAT will license such software interfaces for use with
the NetLOCK  Software and INTERLINK will license such interfaces in the field of
information security.

         NOW, THEREFORE, the parties hereto agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

         Section 1.1 "Platform"  means an operating  system for which a separate
SHIM is required.

         Section 1.2  "NetLOCK  Software"  means the network  security  software
programs that are manufactured,  marketed and distributed by INTERLINK under the
NetLOCK  mark as a standard  item  available to customers of INTERLINK or to the
purchasing public.

         Section  1.3 "SHIM"  means a software  program  for  enabling a NetLOCK
Software  user  to  interface   with  its  particular   Platform,   and  related
documentation.

<PAGE>

         Section  1.4  "SHIM  BUG  FIX"  means a  modification  to a SHIM  which
corrects the SHIM to perform as provided in the SHIM specifications.

         Section 1.5 "SHIM  Specification"  means the specifications  describing
the format, and other requirements for Licensed SHIM, as set forth in Attachment
A, attached hereto and made a part hereof.

         Section 1.6 "Licensed  SHIM" means a SHIM developed by MENTAT set forth
on  Attachment B. Licensed SHIM includes the SHIM in both source code and object
code form as it is originally  provided to Hughes Aircraft Company and as it may
later be  provided  to  INTERLINK  as the  result of  subsequent  modifications,
enhancements, SHIM BUG FIXES, or releases made to it by or for MENTAT, or in any
form of media it may be converted into by the user.

         Section  1.7   "Licensed   Field"   means  all  hardware  and  software
applications in the field of information security.

         Section 1.8 "Net Revenues" means any and all royalties,  fees, or other
amounts  invoiced by INTERLINK or otherwise paid to INTERLINK in connection with
sale,  distribution,  or sublicensing of the NetLOCK  Software to third parties,
less the exclusions set out below. Net Revenues shall not include the following:

         (a)      Credits for actual returns or amounts attributable to bad debt
                  (provided that adjustments for such credits or amounts will be
                  subjected to the royalty rates for NetLOCK  Software when such
                  NetLOCK Software was invoiced);

         (b)      Amounts  invoiced for  reasonable  shipping and handling fees,
                  insurance charges, sales taxes, or other applicable taxes;

         (c)      Price protection  credits and bill-back volume discounts based
                  on the customer's volume performance; and

         (d)      Related  services,  consulting,  support and  warranty-related
                  revenues;  provided  that (i)  hourly  rates for such  related
                  services  (such  as   development  of  custom   applications),
                  consulting  and  warranty-related  revenues  shall not  exceed
                  INTERLINK's   standard  rates  for  its  personnel  performing
                  similar work on other products,  and (ii) the annual price for
                  a support  contract for NetLOCK  Software shall not exceed [*]
                  of  INTERLINK's  standard  price for a  corresponding  NetLOCK
                  Software license.

In a bundled  transaction  involving  both the NetLOCK  Software and one or more
other  products,  "Net  Revenues"  shall  include  only the amount  invoiced  by
INTERLINK  in the  transaction  prorated  between the NetLOCK  Software and such
other products in accordance with INTERLINK's  standard prices for each product.

- ---------------------------------
*Confidential Treatment Requested

                                       -2-

<PAGE>

         Section  1.9  "Effective  Date"  shall  mean  the  date  that  (a) this
Agreement is signed by both parties  hereto;  (b) MENTAT and Hughes  Information
Systems Company execute that certain  Agreement and Mutual Release;  and (c) the
Closing of the Asset Purchase  Agreement  between  INTERLINK and Hughes Aircraft
Company as the term "Closing" is defined therein.

         Section 1.10  "Proprietary  Data" means the terms of this Agreement and
that  content of  information  or software  which has been  originated  by or is
peculiarly  within  the  knowledge  of the  originating  party and is subject to
protection  under  recognized  legal  principles,  provided  that no  element of
information or software shall be considered  Proprietary  Data after any date on
which such element is shown to be available to the general  public without fault
of the receiving party.

                                   ARTICLE II

                                   MAINTENANCE


         Section 2.1 SHIM Support.  INTERLINK shall have the right, upon written
notification  to MENTAT,  to purchase  Support (as defined below) at the rate of
[*] per Platform  per year,  paid at the  beginning  of each year.  Such Support
shall be available for five (5) years. For purposes of this Agreement, "Support"
shall mean

                           (a)  Maintenance,   which  shall  include  correcting
         software  and  documentation   errors  that  are  brought  to  MENTAT's
         attention.

                           (b) SHIM BUG  FIXES for  errors  that  cause  NetLOCK
         Software to become essentially unusable. Such errors shall be corrected
         within [*] calendar days after MENTAT receives notice of the error. All
         other errors shall be corrected  within [*] calendar  days after MENTAT
         receives  notice of the  error;  other than  those  errors  that do not
         substantially  affect the  functionality of the NetLOCK Software or its
         compliance  with the  Specifications,  which errors may be corrected in
         the next SHIM release,  provided such release is made at least once per
         year.

                           (c)  Provision  to INTERLINK of not more than one (1)
         platform update per year due to a manufacturer's change in an operating
         system;  provided that such platform  update is reasonably  expected to
         require not more than two (2) person weeks of effort to modify the SHIM
         to correctly  function on such operating  system  according to the SHIM
         Specification.

- ---------------------------------
*Confidential Treatment Requested

                                       -3-

<PAGE>

In the event that  INTERLINK  purchases  Support for at least five (5) Platforms
per year, MENTAT shall make limited  enhancements such as functionality  changes
to the SHIMs  ("Enhancements") as required by INTERLINK's NetLOCK product plans.
Such Enhancements shall consist of changes or updates requiring no more than two
(2) person weeks of effort,  and MENTAT shall not be obligated to make more than
three (3) to five (5) such  Enhancements  during any one (1) year of the license
term, as mutually  agreed by MENTAT and INTERLINK.  With respect to Enhancements
requiring  more than two (2)  person  weeks of work,  operating  system  updates
requiring more than two (2) person weeks of work, or if more than three (3) such
Enhancements or operating  system updates are requested  during any one (1) year
of the license  term,  such  Enhancements  or updates  shall be performed to the
extent  feasible  given  MENTAT's  engineering  resources and shall be billed to
INTERLINK  on the basis of [*] per person week  devoted to such  Enhancement  or
operating system update.

         Section 2.2 Costs.  Except as otherwise  provided herein,  MENTAT shall
bear all costs, and expenses,  including travel (but excluding travel outside of
Southern  California)  and  salary,  incurred  in the Support of SHIMs by MENTAT
under this Agreement. MENTAT shall provide computer hardware and software needed
to create and maintain its SHIMs if such computer equipment can be purchased for
less than [*]. At  MENTAT's  request,  INTERLINK  will make  computer  equipment
available  to  MENTAT  for  all  other  Platforms  in a  manner  similar  to the
availability  of this equipment to INTERLINK's own  development  staff.  For the
purposes of this paragraph,  it is assumed that MENTAT can maintain a SHIM for a
particular  Platform  using a single  computer of the type for which the SHIM is
targeted.


                                   ARTICLE III

                                  LICENSE GRANT

         Section 3.1 License.  MENTAT  grants to  INTERLINK,  commencing  on the
Effective  Date, a license  including the right to grant  sublicenses,  to make,
have made, use, sell, license, reproduce, demonstrate, market, create derivative
works,  modify,  combine and  distribute  Licensed  SHIMs in the Licensed  Field
solely in connection  with the  distribution  and sale of the NetLOCK  Software.
Such  license  shall be  exclusive  for five (5) years and shall  thereafter  be
nonexclusive.  MENTAT  shall own all right,  title,  and  interest in and to the
LICENSED SHIMs and retains all rights not granted hereunder, including the right
to distribute  Licensed SHIMs outside the Licensed Field,  during the first five
(5)  years  of the  term of  this  Agreement  and in any  application  or  field
thereafter.

- ---------------------------------
*Confidential Treatment Requested

                                      -4-

<PAGE>

         Section 3.2 Sublicenses.  In each instance where INTERLINK  sublicenses
the source code of the Licensed  SHIMs to a sublicensee  in connection  with the
distribution  and sale of the NetLOCK  Software,  INTERLINK  shall  require such
sublicensees to sign a sublicense agreement containing  provisions regarding the
protection  of the  Licensed  SHIMs that shall be no less  restrictive  than the
terms and conditions relating thereto contained in this Agreement.

         Section 3.3 End User Agreement. INTERLINK agrees, and shall require all
its  sublicensees to agree,  to distribute  Licensed SHIMs to third parties only
pursuant to an appropriate  end user  agreement,  such as the end user agreement
attached  hereto as Attachment C, and will take all reasonable  steps to protect
MENTAT's proprietary rights in the Licensed SHIMs. Attachment C contains the end
user  agreement  for  domestic  licenses and that will be the basis for end user
agreements for international  licenses. No rights or licenses are granted herein
to  INTERLINK,  expressly  or by  implication,  under  any  MENTAT  intellectual
property, other than the license granted in Section 3.1.


                                   ARTICLE IV

                                PROPRIETARY DATA

         All Proprietary Data furnished  hereunder by one party to another shall
be treated under  conditions of confidence.  The receiving party agrees:  to use
such  information  and software  only as permitted  in the  performance  of this
Agreement;  to inform  further  recipients of such  information  and software in
advance or at the time of delivery to the  recipients  and in writing that it is
to be treated in confidence;  and to afford such  Proprietary  Data at least the
same degree of  protection  against  disclosure  or  unauthorized  use which the
receiving party exercises in the protection of its own equivalent property,  but
in no event less than  reasonable  care. To the extent that any  information and
software is further transferred by a party as permitted by this Agreement,  such
party will impose the same  requirements  and  restrictions  on the recipient as
apply to it. The  receiving  party  shall  have no  obligation  with  respect to
information  which:  is  publicly  known  otherwise  than by the  breach of this
Agreement by the receiving  party;  or has been  independently  developed by the
receiving party; or was already known to the receiving party prior to disclosure
by the disclosing party and was without  restriction;  or has been  subsequently
received  lawfully  from a third  party  and is  without  restriction.  With the
exception of source code for which there is no time limit, all of the provisions
of this Article 4 regarding use and confidentiality  shall survive expiration or
termination  of this  Agreement  for a period of ten (10) years from the date of
termination.

                                       -5-

<PAGE>

                                    ARTICLE V

                                  COMPENSATION

         Section 5.1 License Fee. Upon the Effective  Date,  INTERLINK shall pay
to MENTAT a license fee of $175,000.00.

         Section  5.2  Royalties.  INTERLINK  shall pay  MENTAT a  royalty  as a
percentage of the Net Revenues in the amount of:

                                       [*]

"Year 1" shall  commence  on the  earlier  of (i) the first day of the  calendar
quarter in which the first  customer  shipment of NetLOCK from  INTERLINK  takes
place;  or (ii) April 1,  1998.  No royalty  shall be due for  NetLOCK  Software
shipped for demonstration purposes,  evaluation copies,  maintenance updates for
existing customers.

         Section 5.3 Minimum Royalties. INTERLINK shall pay minimum royalties to
MENTAT through the end of the first five (5) years of the license term according
to the following schedule:

                                       [*]

Minimum  royalty  amounts  will be paid  thirty  (30) days after the end of each
above stated  period as provided in Article VI below.  Minimum  royalty  amounts
will be paid only to the extent  royalties  payable  under Section 5.2 are below
the  minimum  royalty  amounts  due in the period  corresponding  to the minimum
royalty period listed above.  Notwithstanding the foregoing,  shortfall payments
made during a quarter in Year 1 or Year 2 may be credited against  royalties due
under Section 5.2 in subsequent quarters of each respective Year.

         Section 5.4  Modification  or  Replacement  of Software.  INTERLINK may
modify or replace the SHIM  incorporated  into the NetLOCK  product at any time;
provided,  however,  that  INTERLINK  shall not be relieved of its obligation to
make the royalty payments set forth above during the first five (5) years of the
license term. In the event that INTERLINK  replaces the SHIM entirely  following
the first five (5) years of the license term, INTERLINK shall be relieved of its
obligation to make further royalty payments to MENTAT.

- ---------------------------------
*Confidential Treatment Requested

                                       -6-

<PAGE>

         Section  5.5 Taxes.  All  payments  to MENTAT  hereunder  shall be made
exclusive  of any sales and use taxes.  In the event such taxes are  applicable,
INTERLINK shall pay such sales and use taxes.

                                   ARTICLE VI

                          REPORTS, PAYMENTS AND RECORDS

         Section 6.1 Reports.  INTERLINK  shall  prepare and issue  reports in a
form  satisfactory to MENTAT within thirty (30) days of the end of each calendar
quarter,  identifying  the Agreement  title on the cover page hereof and showing
separately:

                           (a) the total  number of  NetLOCK  Software  units or
         bundles  shipped  during  such  calendar   quarter  and  the  aggregate
         INTERLINK revenues invoiced or otherwise paid to INTERLINK with respect
         to shipment of NetLOCK  Software  units or bundles during such calendar
         quarter upon which  royalties are payable,  and the applicable  royalty
         percentage; and

                           (b)  the  royalties   accrued  during  such  calendar
         quarter and payable to MENTAT.

If no royalties are due to MENTAT, a report to that effect shall be prepared.

         Section  6.2  Payment.  Within  thirty  (30) days after the last day of
March,  June,  September  and  December  of each  year  during  the term of this
Agreement,  INTERLINK  shall  transmit  to  MENTAT a report in  accordance  with
Section 6.1 and payment of the amount stated as due and owing to MENTAT. Payment
shall be sent to the following address:

                  MENTAT INC.
                  ATTN.: PRESIDENT
                  SUITE 315
                  1145 GAYLEY AVENUE
                  LOS ANGELES, CALIFORNIA 90024


         Section  6.3  Audits.  INTERLINK  shall  keep for a period of three (3)
years from the end of a calendar  quarter true and accurate records and books of
account   containing   regular  and  exact  entries  relating  to  all  business
transactions  within the scope of this  Agreement  and shall permit no more than
once  annually,  at mutually  agreed  times,  an  independent  certified  public
accountant  selected  by MENTAT and  acceptable  to  INTERLINK  to inspect  said
records and books and to make and retain  copies or extracts  therefrom.  Should
such examination  result in INTERLINK's  obligation to pay additional  royalties
exceeding  [*] of the  royalties  paid by  INTERLINK  for the  period  examined,
INTERLINK shall also pay the costs and expenses  accrued in connection with such
examination.

                                       -7-

- ---------------------------------
*Confidential Treatment Requested


<PAGE>

         Section 6.4 Late Payments. In addition to its rights under Section 7.2,
MENTAT has the right to require that  INTERLINK pay to it a late payment  charge
of four  percent  (4%) on any and all amounts of royalty  that are fifteen  (15)
days  overdue  and payable to MENTAT,  and in addition  has the right to require
INTERLINK  to pay  interest to it upon any and all  amounts of royalty  that are
thirty (30) days overdue and payable to MENTAT, from the date due to the date of
payment, the rate of such interest being two percent (2%) greater than the U. S.
reference rate at the Bank of America on the day the royalty  payment became due
but in any event no greater than the  applicable  maximum legal rate that may be
then specified by the laws of the State of California.

         Section  6.5  Attorneys'  Fees.  In  the  event  of a suit  under  this
Agreement,  the prevailing party shall be entitled to receive  reimbursement for
its reasonable legal costs and attorney fees.


                                   ARTICLE VII

                              TERM AND TERMINATION

         Section  7.1  Term.  This  Agreement  shall  become  effective  on  the
Effective  Date and shall  continue  unless  terminated in accordance  with this
Agreement.

         Section 7.2 Early Termination.  If either party hereto shall default in
fulfilling any material  obligations and conditions set forth in this Agreement,
and such  default  shall not be  remedied  within  sixty (60) days after  notice
specifying  the nature of such default,  the party not in default shall have the
right to terminate this  Agreement by giving written notice of such  termination
to the defaulting party.

         Section 7.3       Effect of Breach

         (a) Breach by INTERLINK.  Upon  termination of this Agreement by MENTAT
for INTERLINK's breach as provided in Section 7.2 above, the parties' rights and
obligations  under Sections 2.1 and 2.2 shall terminate at MENTAT's  discretion,
and the parties  rights and  obligations  under Articles I, III, IV, V, VI, VIII
and IX shall  continue;  provided that  INTERLINK's  licenses  under Article III
shall be thereafter non-exclusive.

         (b) Breach by MENTAT.  Upon  termination of this Agreement by INTERLINK
for MENTAT's  breach as provided in Section 7.2 above,  the parties'  rights and
obligations under Articles I, II, III, IV, V, VI, VIII and IX shall continue.

Notwithstanding  the foregoing,  end user licenses to use the NetLOCK granted by
INTERLINK  during  the  term  hereof  shall  also  survive  termination  of this
Agreement for any reason.

                                       -8-

<PAGE>

                                  ARTICLE VIII

                                    WARRANTY

         Section  8.1 Right to  License.  Subject  to (a)  Closing  of the Asset
Purchase  Agreement  between Hughes  Aircraft  Company and INTERLINK as the term
"Closing" is defined in that  agreement  and (b) the  execution of the Agreement
and Mutual Release between MENTAT and Hughes Information Systems Company, MENTAT
warrants that it has the right to grant the license  rights granted to INTERLINK
under this Agreement.  MENTAT  warrants that it will  incorporate no third party
components in the SHIMS created by MENTAT under this Agreement.  MENTAT warrants
that to the best of MENTAT's  knowledge  the Licensed  SHIMs do not infringe the
intellectual property rights of others in existence as of the Effective Date.

         Section  8.2  INTERLINK  Representation.  Subject to (a) Closing of the
Asset Purchase  Agreement  between Hughes Aircraft  Company and INTERLINK as the
term  "Closing"  is  defined  in that  agreement  and (b) the  execution  of the
Agreement  and Mutual  Release  between  MENTAT and Hughes  Information  Systems
Company,  INTERLINK  represents that it has acquired  Hughes Aircraft  Company's
rights to the NetLOCK Software.

         Section  8.3  Infringement.  MENTAT  warrants  that it has  received no
notice from a third party that the  Licensed  SHIMs  infringe  the  intellectual
property rights of any third party.

         Section 8.4 MENTAT  Indemnification.  MENTAT will defend and  indemnify
INTERLINK  against any claim of  infringement  of any  copyright,  trade  secret
right,  U.S. patent right or foreign patent right (of which foreign patent right
MENTAT is aware as of the Effective Date) of a third party based on the Licensed
SHIMs,  provided that INTERLINK promptly notifies MENTAT in writing of the claim
and MENTAT has sole control of the defense and related settlement  negotiations.
In the event that the Licensed  SHIMs  become or, in  INTERLINK's  opinion,  are
likely  to  become  the  subject  of a claim  of  infringement  of a  patent  or
copyright,  MENTAT may at its option and upon the agreement of INTERLINK, either
secure rights for INTERLINK to continue use of the Licensed  SHIM, or replace or
modify the Licensed SHIM to make it  non-infringing,  provided any such replaced
or modified  Licensed SHIM continues to meet the  performance  requirements  set
forth in the  particular  SHIM  Specification.  Notwithstanding  the  foregoing,
MENTAT  shall have no liability  to  indemnify  INTERLINK  in any claim  brought
against  INTERLINK  to the extent the  infringement  arises  from the use of (a)
altered SHIMS if such infringement would have been avoided if INTERLINK had used
unaltered  Licensed SHIMS as originally  supplied by MENTAT; and (b) non- MENTAT
licensed software with Licensed SHIMS and the claim for such infringement  would
have been avoided if such non-MENTAT licensed software had not been used.

         Section  8.5  INTERLINK  Indemnification.  INTERLINK  will  defend  and
indemnify MENTAT against any claim arising out of INTERLINK's use,  reproduction
or distribution of the NetLOCK Software,  including any claim of infringement of
any copyright, trade secret right, U.S. patent right or foreign patent right (of
which foreign patent right MENTAT is aware as of the Effective  Date) right of a
third party based on NetLOCK Software other than a claim of infringement

                                       -9-

<PAGE>

of any  intellectual  property right of a third party based solely on a Licensed
SHIM,  provided that MENTAT promptly notifies  INTERLINK in writing of the claim
and  INTERLINK   has  sole  control  of  the  defense  and  related   settlement
negotiations.

         Section 8.6 Disclaimer.  NO WARRANTY EXCEPT FOR THE EXPRESS  WARRANTIES
SET FORTH IN THIS  AGREEMENT ARE OFFERED OR SHALL BE DEEMED TO APPLY.  EXCEPT AS
SET FORTH IN ARTICLE 8, EACH PARTY HEREBY  DISCLAIMS  AND THE OTHER PARTY HEREBY
EXPRESSLY WAIVES,  ANY AND ALL EXPRESS WARRANTIES OR REPRESENTATIONS OF ANY KIND
OR NATURE,  AND ALL  IMPLIED  WARRANTIES,  INCLUDING,  BUT NOT  LIMITED  TO, ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

         Section 8.7 Limitation of Liability.  IN NO EVENT SHALL EITHER PARTY BE
LIABLE TO THE OTHER  FOR ANY  SPECIAL,  INDIRECT,  INCIDENTAL  OR  CONSEQUENTIAL
DAMAGES  (INCLUDING  LOST  PROFIT) IN ANY WAY ARISING OUT OF OR RELATING TO THIS
AGREEMENT WHETHER BASED UPON WARRANTY, CONTRACT, TORT OR ANY OTHER LEGAL THEORY.

                                   ARTICLE IX

                                  MISCELLANEOUS

         Section  9.1  Assignment.  Except  in the case of a  merger  or sale of
substantially all of a party's equity or assets,  neither party shall assign its
interest in this Agreement without the prior written consent of the other party.
Such consent shall not be unreasonably withheld.

         Section 9.2 Dispute Resolution. All disputes, claims, and controversies
concerning this Agreement shall first be reviewed through  management  mediation
in which the CEO of INTERLINK  and the  President of MENTAT shall meet to seek a
resolution  of the dispute.  If the parties fail to reach a mutually  acceptable
resolution  within thirty (30) days, then they shall select a single third party
mediator,  satisfactory  to both  parties.  The  expenses  for the  third  party
mediator  shall be shared equally  between the parties.  In the event the CEO of
INTERLINK,  President  of MENTAT and third party  mediator are unable to reach a
resolution of the dispute  within the subsequent  ninety (90) days,  then either
party may seek resolution of the dispute in any court of competent jurisdiction.
This dispute provision may be invoked by one party delivering  written notice to
the other  specifying  the areas of dispute  and the  intention  to invoke  this
provision of this Agreement.

         Section 9.3  Publicity.  Neither party will,  without the other party's
express  written  permission,  use  in  advertising,   publicity,  marketing  or
otherwise any trade name, trademark or other identification or any abbreviation,
contraction or simulation thereof owned or used by the other party.

         Section 9.4 Advertising.  No advertising or publicity matter having any
reference  to  any  of  the  parties  to  this  Agreement  shall  be  published,
disseminated  or distributed  by any party to the  Agreement,  or anyone on such
party's behalf, unless and until such matter shall have first been

                                      -10-

<PAGE>

submitted to and approved in writing by the party referred to in the advertising
or publicity matter.  Notwithstanding  the foregoing,  either party may disclose
the  existence of this  Agreement,  provided it does not disclose the content of
this Agreement.  Further, the parties acknowledge that INTERLINK desires to make
a press  release  concerning  this  Agreement  within  thirty  (30)  days of the
Effective Date. INTERLINK shall not make such release without MENTAT's approval,
which approval shall not be unreasonably withheld or delayed.

         Section 9.5 Governing Law. The validity,  interpretation, and effect of
this  Agreement  shall  be  governed  by the laws of the  State  of  California,
exclusive of its conflict of law provisions.

         Section 9.6 Notices.  Any notices given  hereunder  shall be in writing
and shall be effective upon receipt. The following addresses shall be employed:

                 MENTAT
                 ------
                              MENTAT INC.
                              ATTN.: PRESIDENT
                              SUITE 315
                              1145 GAYLEY AVENUE
                              LOS ANGELES, CALIFORNIA 90024

                 NTERLINK
                 --------
                              INTERLINK COMPUTER SCIENCES, INC.
                              ATTN.: MS. GLORIA PURDY
                              47370 FREMONT BOULEVARD
                              FREMONT, CALIFORNIA 94538

         THIS AGREEMENT contains the entire understanding between the parties on
the  subject  matter  agreed  upon  and   supersedes   all  prior   discussions,
understandings,  or  agreements  relating  to  the  same  subject  matter.  This
Agreement may be amended only by an  instrument in writing  signed by authorized
representatives of MENTAT and INTERLINK.

                                      -11-

<PAGE>

         IN WITNESS WHEREOF,  MENTAT and INTERLINK have caused this Agreement to
be executed in duplicate by their respective duly authorized  representatives or
corporate officers.


MENTAT INC.                                    INTERLINK COMPUTER SCIENCES, INC.


By: /s/ Kay A. Guyer                           By: /s/ Barbara Booth
    ---------------------------------              -----------------------------
Title: Vice President                          Title: Vice President
- -------------------------------------          ---------------------------------
Date: September 17, 1997                       Date:
- -------------------------------------          ---------------------------------


Attachment A, MENTAT SHIM Specification
Attachment B, Licensed SHIMs
Attachment C, Current NetLOCK Software License Agreement

                                      -12-

<PAGE>

                                  ATTACHMENT A
                            MENTAT SHIM SPECIFICATION


                                       [*]




- --------------------------------
*Confidential Treatment Requested

                                      -13-

<PAGE>



                             ATTACHMENT B
                            LICENSED SHIMS


o                           Windows95
o                           Windows NT 3.51 (including NetLOCK Gateway features)
o                           Windows NT 4.0 (including NetLOCK Gateway features)
o                           Macintosh System 7.6 with Open Transport 1.1
o                           Solaris 2.4/2.5
o                           HP/UX 10.20
o                           SGI IRIX 6.2
o                           SCO OpenServer 5.0.0
o                           IBM AIX 3.2.5 and 4.2
o                           Digital Unix 4.0b

Each  shim  conforms  to the  "NetLOCK  Security  Module:  Shim  Code  Interface
Specification 1.3" (Attachment A) and to the individual  port-specific notes for
that shim.

                                      -14-

<PAGE>

                                  ATTACHMENT C
                   FORM OF NETLOCK SOFTWARE LICENSE AGREEMENT


                                      -15-

<PAGE>

              SOFTWARE LICENSE AGREEMENT NetLOCK(TM) (Object Code)


BY OPENING  THE  PACKAGE  CONTAINING  THE MEDIA OR BY USE OF THE  SOFTWARE,  YOU
(EITHER AN INDIVIDUAL OR ENTITY)  AGREE TO THE FOLLOWING  PROVISIONS.  IF YOU DO
NOT AGREE WITH THESE  PROVISIONS,  RETURN THE  UNOPENED  MEDIA  PACKAGE  AND ALL
MATERIALS TO THE PLACE OF PURCHASE AND YOUR MONEY WILL BE REFUNDED.

This is a license  agreement and not an agreement for sale.  HUGHES  INFORMATION
SYSTEMS COMPANY, 1801 Hughes Drive, PO Box 34028,  Fullerton,  California 92634,
hereby  licenses this Software to you, the LICENSEE,  under the following  terms
and conditions.

1.       The  term  "Licensed  Programs"  means  the  customer-ready,  unopened,
shrink-wrap  packages containing the NetLOCK(TM) computer programs in executable
or machine-readable form and written instructional materials.  Licensed Programs
include a NetLOCK(TM)  Manager for network  security  administration  and one or
more  NetLOCK(TM)  Clients for use on multiple  computers  for  enabling  secure
computer to computer communications. "Licensed Programs" include the software in
object code form and  documentation  as it is originally  provided and as it may
later be  provided in the form of  subsequent  releases or in any form it may be
converted into by the LICENSEE. "Documentation" means the information related to
the  operation  and use of the Licensed  Programs  which is  delivered  with the
Licensed Programs.

2.       If  LICENSEE is a US  Government  agency,  the  Licensed  Programs  are
provided to  LICENSEE as  commercial  computer  software,  as defined in Defense
Federal  Acquisition  Regulation  Supplement  (DFARS)  252.227-7014  or  Federal
Acquisition Regulation (FAR) 52.227-19, as applicable.

3.       LICENSE RIGHTS GRANTED

         (a)      to use the NetLOCK(TM)  Manager on any computer,  provided the
                  NetLOCK(TM) Manager is used on only one computer at a time;

         (b)      to use the NetLOCK(TM)  Clients on the number of computers for
                  which the NetLOCK(TM)  Manager is configured to control as set
                  forth  in  the  shipping  documentation  and  the  NetLOCK(TM)
                  Manager media label;

         (c)      to  reproduce  the  Licensed  Programs,  for the  purposes  of
                  safekeeping  (archives)  or  backup,  provided  all  copyright
                  notices and proprietary, restricted, or limited rights legends
                  are reproduced;

         (d)      to  transfer  this  Licensed  Programs  to  another  party  by
                  transferring   the  original  media  and  all   Documentation,
                  including a copy of this License Agreement,  provided LICENSEE
                  deletes or destroys all other copies of the Licensed Programs;
                  and  provided  the other  party reads and agrees to accept the
                  terms and conditions of this License Agreement.

<PAGE>

4.       Ownership  of the Licensed  Programs and all rights therein,  including
copyrights,  are and will remain in HUGHES, or in third parties from whom HUGHES
has acquired  license rights.  Except for those rights in the Licensed  Programs
specifically  granted  in this  License  Agreement,  no rights  in the  Licensed
Programs and  Documentation are granted to LICENSEE  including,  but not limited
to, to modify,  adapt,  translate  or create  derivative  works in the  Licensed
Programs,  the right to reverse compile or reverse assemble the object code into
source code,  or in any other way to attempt to discover the source code for the
Licensed Programs.  The Licensed Programs in source code form are a trade secret
of HUGHES.  LICENSEE will preserve such Licensed Programs in confidence and will
not  disclose  such  Licensed  Programs to any third  parties.  In the event the
source code becomes known to LICENSEE in any manner, LICENSEE will preserve such
source code in  confidence  and will not disclose  such source code to any third
parties, including, but not limited to, prime contractors,  subcontractors,  and
agents of LICENSEE.  This  provision does not limit the right of LICENSEE to use
Software, Documentation, or information or information contained in the Software
or  Documentation,  which the  LICENSEE  may  already  have or  obtains  without
restriction.

5.       LIMITED WARRANTIED, REMEDIES AND DISCLAIMERS

         (a)      Hughes warrants that the Licensed Programs will  substantially
                  conform to the Documentation  provided by Hughes.  Hughes also
                  warrants  that the media on which the  Licensed  Programs  are
                  distributed is free from defects in materials and  workmanship
                  under normal use. Hughes will replace  defective media or will
                  use  reasonable  efforts to correct  errors,  malfunctions  or
                  defects in the  Licensed  Program at no charge,  provided  the
                  Licensee  returns  the  Licensed  Program to Hughes'  point of
                  shipment, freight prepaid within the warranty period. Licensee
                  understands,  however,  that  Hughes is not obliged to correct
                  every error,  malfunction,  or defect in the  product.  Hughes
                  will  make  available  to  the  Licensee  any  updates  to the
                  Licensed  Programs  which are  released  during  the  warranty
                  period at no additional charge. The warranty period is 90 days
                  unless an Extended Warranty has been purchased.

         (b)      THERE ARE NO WARRANTIES,  EXPRESS OR IMPLIED,  WHETHER ORAL OR
                  WRITTEN,  WITH RESPECT TO THE LICENSED  PROGRAMS AND ANY OTHER
                  GOODS AND SERVICES  COVERED BY OR  FURNISHED  PURSUANT TO THIS
                  LICENSE AGREEMENT,  INCLUDING,  BUT NOT LIMITED TO ANY IMPLIED
                  WARRANTIES OF MERCHANTABILITY,  OR OF FITNESS FOR A PARTICULAR
                  PURPOSE,  NON-INFRINGEMENT,   OR  ARISING  FROM  A  COURSE  OF
                  PERFORMANCE OR DEALING, OR FROM USAGE OR TRADE.

         (c)      IN NO EVENT WILL HUGHES OR ITS SUPPLIERS HAVE ANY LIABILITY TO
                  LICENSEE  OR  ANY  THIRD  PARTY  FOR  DAMAGES  RESULTING  FROM
                  LICENSEE'S USE OR POSSESSION OF THE LICENSED PROGRAMS.

         (d)      IN NO EVENT  WILL  HUGHES OR ITS  SUPPLIERS  BE LIABLE FOR ANY
                  LOSS  OF  PROFIT  OR   REVENUE   BY   LICENSEE,   OR  FOR  ANY
                  CONSEQUENTIAL,  INDIRECT,  INCIDENTAL,  SPECIAL,  PUNITIVE  OR
                  EXEMPLARY DAMAGES

                                       -2-

<PAGE>

                  INCURRED  OR  SUFFERED  BY  LICENSEE  EVEN  IF  HUGHES  OR ITS
                  SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSS OR
                  DAMAGE.

         (e)      HUGHES' AND ITS SUPPLIERS'  LIABILITY UNDER THIS AGREEMENT FOR
                  ANY CLAIM,  CHARGES,  JUDGMENT,  COSTS,  AND  EXPENSES  IN ANY
                  ACTION  REGARDLESS  OF FORM,  INCLUDING BUT NOT LIMITED TO ANY
                  LIABILITY  FOR  PATENT OR  COPYRIGHT  INFRINGEMENTS,  WILL NOT
                  EXCEED THE AMOUNT OF THE LICENSE FEE  RECEIVED BY HUGHES UNDER
                  THIS AGREEMENT.  THE FOREGOING  STATES THE ENTIRE LIABILITY OF
                  HUGHES.

6.       LICENSEE  will not knowingly  export or transfer,  whether  directly or
indirectly,  the  Licensed  Programs  or any  system  containing  such  Licensed
Programs to anyone  outside the country of delivery  without  first  obtaining a
license from the U.S.  Department  of Commerce or any other agency or department
of the United States Government, as required.

7.       In  the  event  any  provision  of this  License  Agreement  is  deemed
unenforceable or invalid, such provision will be modified so as to make it valid
and enforceable, and as so modified the entire agreement will remain in force.

8.       This  License  Agreement  is  effective  until  terminated.  It  may be
terminated by destroying  the software  media and backup copy. It will terminate
automatically  if LICENSEE fails to comply with any of the terms of this License
Agreement,  and on any such termination LICENSEE will destroy the software media
and backup copies.

Hughes  retains  all  rights not  expressly  granted.  Nothing  in this  License
Agreement  constitutes a waiver of Hughes' rights under US Copyright laws or any
other federal or state law.

NetLOCK(TM) is a trademark of Hughes.
(C)Copyright 1993-1996 Hughes Information Systems Company
All Rights Reserved.
HUGHES INFORMATION SYSTEMS COMPANY
1801 Hughes Drive, Fullerton, California 92634

                                       -3-




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