A Buyer-Seller Digital Watermarking Protocol without Third Party Authorization

Abstract

For protecting copyright of digital work, a kind of digital work commerce protocol is proposed based on RSA public key system. Digital fingerprint information that embedded in digital work can only be generated by the cooperation of the publisher and the user. The publisher cannot obtain this digital work, but the publisher can judge whether the fingerprint information exists in illegal copied digital work. This protocol can be utilized to trace and accuse the illegal piracy. Meanwhile, it can also protect legal user from framed by publishers. The digital fingerprint identification procedure that dispenses with participation of the third party can effectively avoid forgery in the procedure, which makes the scheme more convenient and safer than the scheme that needs the third party.