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Method and apparatus for copy protection for various recording media

  • US 5,513,260 A
  • Filed: 06/29/1994
  • Issued: 04/30/1996
  • Est. Priority Date: 06/29/1994
  • Status: Expired due to Term
First Claim
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1. A method of providing copy-protection for a program distribution medium comprising the steps of:

  • adding an authenticating signature to media to be copy-protected;

    passing program data through a first encryptor;

    passing said first encrypted program data from said first encryptor through a second encryptor;

    recording the data from the second encryptor on a media;

    detecting the authenticating signature in a media player;

    passing decoded data from said media through a first decryptor;

    passing said first decrypted data from said first decryptor through a second decryptor;

    selecting an output of said second decryptor when an authenticating signal is detected, and selecting an output of said first decryptor when an authenticating signature is not detected.

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