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Method and apparatus for watermarking digital bitstreams

  • US 6,330,672 B1
  • Filed: 06/30/1998
  • Issued: 12/11/2001
  • Est. Priority Date: 12/03/1997
  • Status: Expired due to Term
First Claim
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1. Apparatus for inserting a digital watermark into protected information comprisesa transformation function of a perceptual coder for coding an information signal representative of the protected information, a watermark location selector responsive to the perceptual coder for selecting a location for inserting a digital watermark, said watermark location selector including a logical gate responsive to a random number generator, said random number generator, responsive to a seed and a selection of a watermark overhead, for outputting a binary sequence, a digital watermark generator for generating a digital watermark sequence responsive to a plurality of predetermined watermark parameters and a quantizer of the perceptual coder responsive to the digital watermark generator and the watermark location selector for inserting a digital watermark at selected locations within an output bitstream, said output bitstream including the perceptually coded information signal.

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