A digital watermarking apparatus inputs video or audio information and embeds digital watermark in the information, which is capable of preventing digital watermark or set values necessary for digital watermarking operation from being altered. The apparatus includes a verifying section, a decrypting...http://www.google.de/patents/US7278020?utm_source=gb-gplus-sharePatent US7278020 - Digital watermarking apparatus and application apparatus using the same
