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Methods and apparatus for embedding watermarks

  • US 8,085,975 B2
  • Filed: 11/05/2009
  • Issued: 12/27/2011
  • Est. Priority Date: 06/13/2003
  • Status: Expired due to Fees
First Claim
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1. A method for embedding a watermark, the method comprising:

  • identifying a transform coefficient associated with a compressed digital data stream;

    obtaining a mantissa code; and

    modifying the transform coefficient based on the mantissa code to embed the watermark, wherein the mantissa code is a first mantissa code, and wherein modifying the transform coefficient comprises substituting the first mantissa code for a second mantissa code associated with the transform coefficient.

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