Authentication of physical and electronic media objects using digital watermarks
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United States of America Patent
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Oct 26, 2010
Grant Date -
Mar 12, 2009
app pub date -
Sep 9, 2008
filing date -
Apr 17, 2000
priority date (Note) -
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Abstract
A content watermarking method derives a watermark key from data representing content. In one particular method, a plural symbol message is algorithmically transformed in dependence on the derived watermark key. In another arrangement, the key specifies how or where the message is embedded in the content. A variety of other features and arrangements are also detailed.
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