P2p Environment Downstream Media Copyright Protection System Design And Implementation

Along with the development of computer technology, especially network technology. People already don't satisfy with the unmeaning network application, then the application of frequency and video technologies have been well developed. So in the transmition of multimedia data, the advantage of the P2P technology has been well exhibited. The P2P network not only gives us good experience in get media data, but also copyright dispute. Since the first big case of copyright dispute - Napster, people have paid more attention on the on copyright protection.Based on the research of P2P and DRM technology, proposed the H.264 selective algorighm based on FMO, and DRM policy under P2P network based on broadcast encryption. The detail of these works is like this:(1) Introduce the conception, research status, application area and the problems of P2P and Digital Rights Management.(2) Emphasize the copyright dispute with P2P technology, the development and problem of DRM(Digital Rights Management).Chapter 2: Tells the main technology about digital rights management, and mainly about the digital encrypt algorithm and watermark. Then analyse their inelasticity under P2P network. And studied the selective algorighm used in video encryption.(3) Mainly talk about the H.264 standard, its technologies, and its error resiliency. And take the characteristic of network transmission and the limit of transmission speed, many scholars have take research of video encryption algorithm, and have put forward a lot of video encryption and decryption algorithm, witch fit for the transmission of video in the network. After studying of some of algorithm, especially the selective algorithm, include video encryption based on frame I and DCT, I get more ideas about encryption. Then proposed an H.264 selective algorighm based on FMO.(4) First talk about the broadcast encryption, then analyse its applicability under P2P network. At the same time, I studied the error resiliency of H.264 standard, mainly about FMO. Then proposed the video selective algorithm based on FMO. This algorithm takes the advantage of FMO-map, makes can't get all the video data correctly, without the correct gain of FMO-map. And through the disturbance to H.264 data, it lives up to good encryption effect, in the instance of little influence to transmission. After the investigation about classical drm technology, include the rights management and license release, found the malajustment of classic drm to the dispersive character of P2P network. After that, studied the broadcast encryption, and syncretized it into the P2P constructure, then proposed a license release policy. It let the license transmited from node to node with P2P method. And it makes the nodes in the same authorization domain have the same lights. As a result, this policy archives the load balance, and minish the time delay in transmission. In the multi-user experiment, get a good performance. Then poroposed our new DRM policy under P2P network based on broadcast encryption.(5) Make a full introduction of our DRM system under P2P network. And mainly about its two module, one is DRM module, another is P2P module. Then talk about its achieve. Based on these results, design and carry out a DRM system under P2P, and the practical test insures the usability and stability of the system.