Method and apparatus for recording and reproducing electronic watermark information, and recording medium
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United States of America Patent
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Feb 11, 2003
Grant Date -
Feb 28, 2002
app pub date -
Oct 26, 2001
filing date -
Sep 3, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
When a video signal having electronic watermark information embedded therein is recorded on a recording medium, a reference signal is inserted in the video signal at a position different from a position of embedment of the electronic watermark information. The electronic watermark information is embedded in the video signal by alteration of a luminous value of a luminance signal included in the video signal. When the video signal is reproduced from the recording medium, a luminous value of the electronic watermark information is modified based on the reference signal.
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