A Buyer-seller System Based On Digital Watermarking

With the rapid development of multimedia technologies and web, the perfect product copyright protection project need to build up urgently. This project would protect the rights of the copyright owns.Digital watermarking has been presented as a new method for copyright protection and the trace of the copies by embedding a secret signal in a digital image or video sequence. Digital watermarking describes methods and technologies that allow hiding information, for example a number or text, in digital media, such as images, video and audio. The embedding takes place by manipulating the content of the digital data, that means the information is not embedded in the frame around the data. The hiding process has to be such that the modifications of the media are imperceptible. For images this means that the modifications of the pixel values have to be invisible.At first, through analyzed the previously proposed protocols, this paper designs a new buyer-seller protocol based on digital watermarking. Then it discusses the effect of The Watermarking Certification Center in the protocol, and protects the tights of the sellers and buyers at one time. Then, this paper designs a buyer-seller system based on the protocol.At second, this paper introduces the technology of the system, such as the digital watermarking, RSA, Digital Signature and Timestamp technologies. It makes programs for them.using MATLAB.At last, this paper makes program for the buyer-seller system based on digital watermarking.