Equipment employing watermark-based authentication function
AssigneeDigimarc Corporation
InventorsGeoffrey B. Rhoads, Ammon E. Gustafson
Life of this patent
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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.
Claims5
Electronic equipment including an authentication function, the equipment including a steganographic watermark detector that checks sampled data for the presence of first and second steganographic watermarks, the first watermark being relatively frail and the second watermark being relatively robust, the equipment determining that the sampled data is authentic only if both watermarks are present.
Dependencies are inferred from the claim text.