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Users in a Peer-To-Peer Video on Demand (P2P VoD) system are allowed to watch any video file at any point in time and to use VCR operations like fast forward, rewind and pause at any time, which decreases their ability to help each other and offload the server. Encouraging peers to stay in the system longer and share the video files they have downloaded completely can greatly increase peers' cooperation and alleviate server's load. So the authors propose a lightweight incentive mechanism based on virtual currency to improve the performance of the system.
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