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Formation and analysis of signals with common and transaction watermarks

  • US 6,430,301 B1
  • Filed: 08/30/2000
  • Issued: 08/06/2002
  • Est. Priority Date: 08/30/2000
  • Status: Expired due to Term
First Claim
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1. A method for embedding watermarks in a host signal, comprising the steps of:

  • forming watermarked copies of the host signal with at least one different transaction watermark and at least one common watermark embedded therein; and

    assembling portions of the different watermarked copies according to a transaction code such that an output signal with transaction watermarks that correspond to the transaction code is formed and such that the at least one common watermark can be subsequently used to recover the at least one transaction watermark.

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