本論文研究以點對點網路(P2P)架構傳輸即時影像碼流之方法IPTV。整個系統之建置涵蓋一個採用數位權利伺服器(DRM server)、一至數個媒體串流伺服器(media streaming server)以及多個交互傳輸碼流的IPMP終端機(peers)。為了提升整體IPTV的服務效能:當新的節點加入IPTV群播對數位媒體發出存取要求時，數位權利伺服器確認使用者身份後，經由安全通道將對應之金鑰、解碼工具與憑證，傳送至使用者端。系統會選擇傳輸能力略高於新節點、傳輸延遲低的父節點，並嚴格限制只有認證核可的用戶可以互相進行連線，以維持整體IPTV的穩定傳輸骨幹;當線上節點要離線時，則先為其所有子節點依照新節點加入的方法找尋最佳接入點，然後再更新其父節點的傳輸參數。另外，媒體伺服器可依據現有網路狀況調整參數，改變壓縮品質，產生不同大小串流並進行加密。當加密影像傳送至一個播放節點，會同時和其它節點交換（提供或索取）數據，如此得以有效的分散整體系統的傳輸負載。在使用者與伺服器資料交握階段中，使用者登入的資訊、憑證與即時串流的金鑰，皆會以AES來加密。即時串流使用之DES金鑰會不斷更換，以保障即時串流安全性。實驗結果顯示本論文有效結合P2P串流網路與數位管理，並在大多數節點效能不佳時，仍能保持P2P串流網路的一定效能。

A real-time P2P-IPTV system has been developed in this thesis. The system comprises: one digital right management server (DRM server), one media streaming server and many IPMP terminal peers. When one new peer requests the media server to join the IPTV system, the DRM server afer recognizing its ID, transmit by secured data a key to unlock the input stream and the certification for displaying the file according to granted right. To improve the IPTV service efficiency, the system would select a parent peer with low-delay and uplink capability better than the incoming peer. It would maintain the basic stable transmission framework. When one peer would leave, it has to find for each children peer a new parent peer according to above rules before updating the parent peer parameter of current one. In addition, the system can adjust the streaming size of media server in accordance with current network condition. When one peer import the streaming, it would also outport the streaming to other online peers, which would help to distribute the transmission loading for the whole IPTV system. The key of user profile is encrypted with AES. The certificate is encrypted with regularly updated DES keys to prevent hacker attack. Experiments show that the average frame rate and the transmission delay are maintained in good performances even when most peers are with low uplink capability.

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