Supported in part by the Hi-Tech R&D Program (863) of China (2006AA01Z444);the CNGI 2006 Application Demonstration Program (The IPv6 Distributed Multi-media Communication System Based On SIP and WISI/WIMAX );Tsinghua-Microsoft Key Laboratory Fund Project
The rapid development of Internet has led to the explosion of information sharing, and how to supervise the sharing is a main research topic on current Internet. Aiming at the disadvantage that the current Peer-to-Pee...