Efficient Fair Content Exchange with Robust Watermark Ownership

Abstract

In recently years, the Internet is the major media to convey or delivery digital contents. Users can purchase or sell the digital contents on the Internet. Also some approaches can use the digital watermark to claim that some digital contents are owned by proofing the corresponding digital watermark to other users. In recently years, a lot of buyer-seller watermarking protocols were proposed. However, when users may want to exchange their digital contents by using these proposed protocols, none of them cannot cope with the watermark exchange problem. By the way, due to the security problem of network, users may not trust each other, so the mutual authentication between users must be ensured before exchanging digital contents. In addition, how to exchange the digital contents fairly on the Internet is another problem since users may not be honest. Not only our proposed scheme can exchange their watermarked digital contents securely but also keep their exchange process fairly to each other.