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Copy protection method and system for digital media

  • US 7,254,838 B2
  • Filed: 05/01/2002
  • Issued: 08/07/2007
  • 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;

    (d) delivering said encrypted media data set, said encrypted intermediate key, and a media certificate to said playing device, said certificate including a private key identification of said playing device;

    (e) searching for an actual private key corresponding to said private key identification;

    (f) decrypting said delivered intermediate key with said actual private key;

    (g) obtaining said original media key by decrypting said decrypted intermediate key with said media identification; and

    (h) decrypting said delivered media data set with said obtained media key, wherein said media identification and said public key are separately provided and are independent of each other.

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