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Method and device for controlling distribution and use of digital works

  • US 20020023219A1
  • Filed: 08/15/2001
  • Published: 02/21/2002
  • Est. Priority Date: 08/16/2000
  • Status: Abandoned Application
First Claim
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1. A method for controlling distribution and use of a digital work (DW), comprising the steps of:

  • a) attaching a usage right information to said digital work (DW), said usage write information defining one or more conditions which must be satisfied in order for said usage right to be exercised;

    b) storing said digital work (DW) and its attached usage right information on a record carrier (10);

    c) updating said attached usage right information with every use of said digital work (DW); and

    d) refusing the use of said digital work if said usage right information indicates that the usage right has been exercised;

    characterized in that e) a hidden information (KLK) stored in a hidden channel and used for encrypting or verifying said usage right information is changed when said usage right information has changed.

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