May 11, 1997
 
                          MEMORANDUM OF UNDERSTANDING
 
     WHEREAS,  TTR INC., a Delaware corporation, ('TTRINC') and TTR Technologies
Ltd., a  corporation organized  in the  State of  Israel, ('TTR  Limited'),  and
collectively  ('TTR')  has  developed,  and  holds  all  proprietary  rights to,
technology  which  may  prevent  the  faithful  reproduction  of  optical  media
(hereafter 'DiscGuard').
 
     WHEREAS,  NIMBUS CD INTERNATIONAL INC.,  a Delaware corporation, ('Nimbus')
is a world-recognized CD-ROM replicator.
 
     WHEREAS, DOUG CARSON AND ASSOCIATES, a Oklahoma corporation, ('DCA') is  in
the  business  of supplying  mastering interface  systems ('MIS')  for different
types of laser mastering machines for use in the optical media industry.
 
     WHEREAS, DCA is  in the process  of developing a  MIS which integrates  the
DiscGuard  technology  for  use  on laser  mastering  machines  (hereinafter the
'Enhanced MIS Unit');
 
     WHEREAS, Nimbus desires and  agrees to integrate a  Enhanced MIS Unit  into
one  of its laser  mastering machines in order  to produce, on  a trial basis, a
DiscGuard enhanced glass master and to  undertake a test run of 1,000  DiscGuard
protected CD-ROMs (hereinafter the 'First Run'); and
 
     WHEREAS,  the parties wish  to enter into  this Memorandum of Understanding
('MOU') to set forth the principles of their relationship.
 
     NOW, THEREFORE, for the mutual covenants and premises contained herein, the
parties hereto agree as follows:
 
      1. Nimbus will work jointly with DCA to complete the First Run by May  15,
         1997.  TTR will  provide all assistance  to so complete  the First Run.
         Nimbus will supply  twenty (20)  discs, for  approval by  TTR prior  to
         replicating  and packaging the  First Run. The First  Run discs will be
         packaged in Jewel boxes with booklets  and inlays. The product will  be
         overwrapped.  Nimbus  will bear  the  costs of  replicating  the discs,
         ordering booklets  (two page  maximum) and  inlays using  TTR  supplied
         artwork  and packaging the  discs. All shipping costs  will be borne by
         TTR.
 
      2. For the 6 month period beginning  from the date of distribution of  the
         First  Run anticipated to be June 3, 1997, the opening day of Replitech
         (the 'Exclusivity Period'), TTR shall not grant to any third party  the
         right  to replicate DiscGuard protected  CD-ROMs; however, TTR shall be
         entitled to grant to any third party the right to integrate a  Enhanced
         MIS Unit into its laser mastering machines.
 
      3. Upon  the completion of  the First Run and  for the Exclusivity Period,
         TTR shall  grant  to Nimbus  a  non-exclusive (except  as  provided  in
         paragraph  4  below),  non-transferable license  to  use  the DiscGuard
         technology for the purpose  of replicating DiscGuard protected  CD-ROMs
         and DVDs (hereinafter, the 'Nimbus License').
 
      4. During  the  Exclusivity Period  of  the Nimbus  License,  Nimbus shall
         integrate the Enhanced MIS Units into its laser mastering machines  and
         may  not use any  technology or unit that  is directly competitive with
         DiscGuard. The  Security  Band and  Edge  to Edge  hologram  technology
         offered  by  3d-cd,  L.L.C.,  a  joint  venture  company  of  Nimbus is
         specifically excluded from this provision. In addition, the use of  the
         Content  Scramble System or the  Analog Protection System technology of
         Macrovision Corporation will  also not  be prohibited  under the  terms
         hereof.
 
      5. The  prototype Enhanced MIS Unit will be  provided at no cost to Nimbus
         and remain  available  to Nimbus  for  the entire  Exclusivity  period.
         Improvements  or  changes in  this unit  will be  provided in  a timely
         fashion at no cost to Nimbus. Nimbus reserves the right to  discontinue
         the use of the Enhanced MIS Unit at any time. Following the Exclusivity
         period,  if Nimbus elects to purchase the Enhanced MIS Unit, Nimbus and
         DCA and Nimbus and TTR agree to negotiate in good faith to establish  a
         purchase price.
 
      6. During  the  Exclusivity  period,  TTR agrees  to  refer  all potential
         customers for the DiscGuard technology to Nimbus.
 


      7. With respect to each DiscGuard protected Disc sold or distributed by or
         on behalf of Nimbus, Nimbus shall pay  TTR 50% of the per disc  premium
         revenue charged for each DiscGuard disc sold. It is understood that the
         per  disc premium revenue charge will be  a minimum of $.15 but TTR and
         Nimbus reserve  the  right  to  charge  the  amount  charged  based  on
         marketing considerations and mutual agreement.
 
      8. TTR  shall  grant  Nimbus preferred  terms  on all  future  payments of
         royalties, such that retained per disc  premiums are at least 20%  more
         favorable than those granted to other replicators.
 
      9. With  respect  to each  DiscGuard title  sold or  distributed by  or on
         behalf of Nimbus,  TTR shall make  it known to  DiscGuard title  owners
         that  a mandatory $1,500  mastering charge is to  be applied by Nimbus.
         Nimbus shall  pay TTR  $1,000 from  the gross  consideration  received;
         however,  Nimbus shall  only be obligated  to pay TTR  if the mastering
         charge is collected. It is understood that this charge is to be applied
         on a per title basis and not a per Glass Master basis.
 
     10. All amounts owed by Nimbus  to TTR will be  paid on a quarterly  basis.
         Nimbus  will accord to TTR  the right to audit,  with notice and during
         normal business  hours, Nimbus'  records to  verify Nimbus'  compliance
         with  its  payment  obligations. The  amounts  paid for  such  sales or
         distribution shall be adjusted annually.
 
     11. Each purchaser (i.e.,  software and electronic  content developers  and
         title  publishers)  of  DiscGuard  protected CD-ROMs  or  DVDs  will be
         informed by Nimbus through a notice, approved by TTR, that DiscGuard is
         proprietary to TTR,  disclaim any consequential  liability and  require
         such  purchaser  to take  affirmative action  whereby the  purchaser is
         bound to a standard TTR license respecting the use of DiscGuard. Nimbus
         will notify  TTR  and provide  data  regarding every  mastering  and/or
         replication job including the number of Discs finished shipped.
 
     12. TTR agrees to hold Nimbus and DCA harmless from and against any and all
         liabilities,  costs and  damages (including  reasonable attorney's fees
         and litigation cost, regardless of outcome) arising out of or  relating
         to  DiscGuard's  infringement of  third  party IP  rights.  All parties
         hereto shall agree to include limitation of liability provisions in the
         'Agreement.'
 
     13. The parties shall issue a media release  to the public (in a form  that
         has  been approved in writing by both parties) to announce the business
         relationship being created by this MOU.
 
     14. Within 30 days of execution of this MOU the parties shall enter into an
         agreement incorporating,  inter  alia, the  principal  terms  contained
         herein (the 'Agreement').
 
     IN  WITNESS WHEREOF,  each of the  Parties has  caused this MOU  to be duly
executed on its behalf as of the date first written above.

             TTR INC.                              DOUG CARSON AND ASSOCIATES

By:        MARC TOKAYER                     By:           DOUG CARSON
   ..............................              .................................
           Mark Tokayer
      Chairman and President
 
 
       TTR TECHNOLOGIES LTD.                      NIMBUS CD INTERNATIONAL, INC.
 
 By:        ARIK SHAVIT                     By:            JOHN TOWN
    .............................              .................................
          Arik Shavit, CEO                             John Town, VP R&D