Importance

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Abstract

A system enables encoding of a removable mark into digital data, and decoding of the mark from the digital data. The system comprises an encoder and a decoder. The encoder includes a target area locator for locating in the digital data a flat area having a flatness value n, and includes a marker for using the flatness value n to encode a mark into the flat area. The decoder attempts to extract a mark that includes a plateau and a core from digital data. The decoder includes a mark area locator for using a flatness value n to search digital data for a possible plateau, an unmarker coupled to the flat area locator for decoding a possible core upon locating a possible plateau and for using the flatness value n to replace the possible core with possible original data, and an authenticator coupled to the unmarker for examining the possible core for accuracy.

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First Claim