Method for protecting content using watermarking
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United States of America Patent
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Sep 7, 1999
Issued Date -
N/A
app pub date -
Aug 29, 1997
filing date -
Mar 12, 1996
priority date (Note) -
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Abstract
A watermarking procedure wherein each of a set of copies of the work has a slightly-modified form of a 'baseline' watermark that is placed within a critical region of the data. The slight variations in the watermarks, however, are not perceptually visible and do not interfere with the work. If multiple persons collude to attempt to create an 'illicit' copy of the work (i.e., a copy without a watermark), however, at least one of the modified watermarks is present in the copy, thereby identifying both the illicit copy and the copier.
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