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Method and apparatus for copy protection

  • US 6,523,113 B1
  • Filed: 11/09/1998
  • Issued: 02/18/2003
  • Est. Priority Date: 06/09/1998
  • Status: Expired due to Term
First Claim
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1. A method of copy protecting content comprising:

  • receiving content to be recorded, the content including a watermark encoded in the content and the watermark indicating that the content is copy protected;

    receiving an encrypted permission key;

    decrypting the encrypted permission key providing a decrypted permission key;

    extracting the watermark from the content;

    comparing the decrypted permission key and the watermark to determine if the decrypted permission key and the watermark match; and

    permitting the recording of the content if the decrypted permission key and the watermark match and otherwise prohibiting the recording of the content.

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