DIGITAL WATERMARK EMBEDDING DEVICE, COMPUTER-READABLE RECORDING MEDIUM, AND DIGITAL WATERMARK DETECTING DEVICE AND COMPUTER-READABLE RECORDING MEDIUM

摘要

An digital watermark embedding device including an interface unit configured to acquire content in a digital form and digital watermark information, the device includes, a codeword generating unit configured to generate a base codeword including a bit sequence including the digital watermark information; a shifting unit configured to generate a plurality of correcting codewords differing from one another by permutating an arrangement in the bit sequence included in the base codeword depending on a plurality of shift amounts, the plurality of shift amounts differing from one digital watermark information to another, under a predetermined permutation rule; and a watermark superimposing unit configured to embed the plurality of correcting codewords in the content.