Cryptography – By modifying optical image
Patent
1996-03-12
1997-09-02
Gregory, Bernarr E.
Cryptography
By modifying optical image
380 3, 380 4, 380 23, 380 55, 283 73, 283113, 283 17, G09C 500, H04L 900
Patent
active
056640188
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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Gregory Bernarr E.
Judson David H.
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