Importance

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Abstract

A watermark is encoded redundantly so as to provide effective copy protection. To assure a reliable detection of the watermark in the presence of a potentially faulty watermark detection process, some or all of the watermark is redundantly encoded. The number of redundant encodings of the watermark is selected so that upon modification of the watermarked material, sufficient redundancy exists so that the material can be identified as watermarked material, and the number of detected copies of the watermark is used to detect the modification. Statistical processes are employed to determine the presence or absence of the watermarks in the presence of a potentially faulty watermark detection process. Different criteria may be applied to the watermark detection process for the verification of the watermarked portions, based on the desired degree of confidence for determining whether the appropriate watermark is present or absent, and the desired degree of confidence for determining whether a modification has occurred.

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First Claim