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Method and apparatus for watermarking with no perceptible trace

  • US 6,564,322 B1
  • Filed: 01/26/1999
  • Issued: 05/13/2003
  • Est. Priority Date: 01/26/1999
  • Status: Expired due to Term
First Claim
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1. A method for attaching an added message to a digital message embodied in physical support media so that the significant content of the digital message is completely unchanged comprising the steps of hiding the added message in an error correcting code for the significant content of the digital message and encrypting at least a portion of the significant content to generate the added message, wherein the step of encrypting uses a public key encryption method, said method having a public key/private key pair and being used to ensure that the hidden message is provided by a party having access to said private key, and further being used to protect said hiding step, and wherein a unique identifier associated with said physical support media is attached to said added message.

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