A secure and practical buyer-seller watermarking protocol

A buyer-seller watermarking protocol can enable a seller to successfully identify a traitor from a pirated copy, while preventing the seller from framing an innocent buyer. To this end, many buyer-seller watermarking protocols have been proposed. In the existing watermarking protocols, one or more of the major common problems which are customer's rights, unbinding problem, buyer's anonymity problem and buyer's participation in the dispute resolution have been solved. But most of them are infeasible and not suitable for web context. First, most of the protocols assume that the buyer has the knowledge of cryptography and watermark. However, the buyer often has no knowledge of cryptography and watermark. Second, a buyer needs to interact with different parties many times in these protocols, and then it is very inconvenient for buyer. To overcome these drawbacks, a new buyer-seller watermarking protocol is proposed.