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Method and apparatus for recording and reproducing electronic watermark information, and recording medium

  • US 6,519,351 B2
  • Filed: 10/26/2001
  • Issued: 02/11/2003
  • Est. Priority Date: 09/03/1997
  • Status: Expired due to Term
First Claim
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1. A recording medium having a record of a video signal, electronic watermark information which is embedded in the video signal, and a reference signal which is inserted in the video signal at a position different from a position of embedment of the electronic watermark information;

  • wherein the reference signal includes a first reference signal and a second reference signal, the first reference signal having an amplitude equal to a peak white level, the second reference signal having an amplitude smaller than the amplitude of the first reference signal.

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