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Detecting watermark modifications

  • US 10,366,466 B2
  • Filed: 10/11/2018
  • Issued: 07/30/2019
  • Est. Priority Date: 11/24/2015
  • Status: Active Grant
First Claim
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1. A system to detect watermark modifications, the system comprising:

  • a watermark encoder to encode a second watermark in a sampled media signal obtained from a received broadcast signal, the sampled media signal already encoded with a first watermark that was included in the received broadcast signal;

    a watermark decoder to detect the first watermark and the second watermark in the sampled media signal;

    a watermark modification evaluator to compare a first metric determined for the first watermark and a second metric determined for the second watermark to determine whether the first watermark was modified prior to being included in the received broadcast signal; and

    a ratings server to revise ratings data corresponding to the received broadcast signal when the first watermark is determined to have been modified prior to being included in the received broadcast signal.

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