The emerging multimedia Internet application IPTV over P2P network preserves significant advantages in scalability. IPTV media\r\ncontent delivered in P2P networks over public Internet still preserves the issues of privacy and intellectual property rights. In\r\nthis paper, we use SIP protocol to construct a secure application-layer multicast overlay network for IPTV, called SIPTVMON.\r\nSIPTVMON can secure all the IPTV media delivery paths against eavesdroppers via elliptic-curve Diffie-Hellman (ECDH) key\r\nexchange on SIP signaling and AES encryption. Its load-balancing overlay tree is also optimized from peer heterogeneity and\r\nchurn of peer joining and leaving to minimize both service degradation and latency. The performance results from large-scale\r\nsimulations and experiments on different optimization criteria demonstrate SIPTVMON�s cost effectiveness in quality of privacy\r\nprotection, stability fromuser churn, and good perceptual quality of objective PSNR values for scalable IPTV services over Internet.
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