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Copy protection method and system for digital media

  • US 7,877,813 B2
  • Filed: 07/26/2007
  • Issued: 01/25/2011
  • Est. Priority Date: 05/11/2001
  • Status: Expired due to Fees
First Claim
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1. A copy protection method for digital media, the method comprising:

  • (a) encrypting an original media data set with a symmetric algorithm corresponding to an original media key;

    (b) generating an intermediate key by encrypting said original media key with a media identification;

    (c) encrypting said intermediate key with a public key of a compliant playing device; and

    (d) delivering said encrypted media data set, said encrypted intermediate key and a media certificate to said playing device, said media certificate including said media identification and a private key identification of said playing device, said private key identification generated by encrypting said media identification with said public key of said playing device, wherein said private key identification is used to recognize a valid private key among private keys stored in said playing device, and said media certificate is used to verify said valid private key.

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