Equipment employing watermark-based authentication function
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United States of America Patent
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Oct 12, 2004
Grant Date -
Nov 28, 2002
app pub date -
Mar 28, 2002
filing date -
Jan 20, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Appropriate action can then taken in response thereto.
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