在傳統主從式(Server/Client)網路架構中，多媒體串流廣播服務所需要的網路頻寬較大，儘管伺服器端網路傳輸頻寬再大，但往往受限於客戶端同時連線的節點數目增加影響，伺服器端網路容易出現壅塞現象，故客戶端無法接收到一定品質的多媒體串流服務。雖然IP-Multicast協定可以降低伺服器端網路頻寬供給的需求，但在現實網路中，為了防止濫用網路服務和惡意網路攻擊，大部分路由器都關閉IP-Multicast協定的支援。而使用應用層群播(Application Layer Multicast, ALM)方式傳輸是解決這問題的另一途徑。本論文主要在利用ALM網路群播方式，設計並實作一點對點網路影像廣播系統名為Peer to Peer Internet Protocol Video Broadcasting System，簡稱IPVB。該系統利用點對點網路技術優點建構一串流群播樹，充份利用客戶端節點的網路資源來分散伺服器因客戶端節點同時連線數目過多時所造成的沉重負荷，使得所有客戶端節點皆可接收一定品質的多媒體串流服務。另外又針對串流廣播的數位內容，設計相關資訊安全保護機制如數位權利管理(Digital Rights Management, DRM)對使用者身份認證管理、通用加擾演算法(Common Scrambling Algorithm, CSA)對串流中的資訊予以加擾保護等。

In traditional Server and Client network architectures, multimedia streaming
service needs a large of network bandwidth for a better quality of service. Despite a large network bandwidth at server side, the effective network bandwidth could be consumed quickly when a large number of client nodes simultaneously connect to the server. So the client nodes are not guaranteed to receive a certain quality of multimedia streaming services. In general, IP-Multicast protocol can alleviate the demands of network bandwidth of server side; however in real networks, in order to prevent abuse of network services and malicious network attacks, most routers are limited to closed IP-Multicast protocol support. An alternative to solve this problem is the way of Application Layer Multicast transmission. Based on the network multicast technology of Application Layer Multicast, this thesis designs and implements of a P2P network video broadcasting system, called IPVB. Utilizing the benefits of P2P networking technology to construct a streaming multicast tree, this system takes full advantage of the network resources of client nodes to spread the heavy load of server when an excessive number of connections from client nodes are occur. As a result, all client nodes could receive certain quality multimedia streaming services. The system has an additional of advantage of security protection mechanisms for streaming digital content such as user authentication and streaming information scrambling protection.

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