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Method and system to uniquely associate multicast content with each of multiple recipients

  • US 7,058,809 B2
  • Filed: 03/06/2001
  • Issued: 06/06/2006
  • Est. Priority Date: 03/06/2000
  • Status: Expired due to Term
First Claim
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1. A computer-implemented method for providing encrypted copies of content comprising:

  • encrypting a copy of at least one part of the content having a first watermark;

    encrypting a copy of at least one part of the content having a second watermark; and

    providing encrypted copies for each of a plurality of clients by combining parts of the encrypted copy with the first watermark and parts of the encrypted copy with the second watermark in a manner unique for an individual client, such that the encrypted copies have a unique combination of sections marked with the first watermark and sections marked with the second watermark.

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