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The Internet and computer IT technology are cultural changes that lead to the creation of the U-knowledge society. This increases the demand for comprehensive network services linked to IP addresses. IPTV has security issues such as illegal control and distribution, access from unauthorized users, sniffing, eavesdropping, denial of service, war dialing, man-in-the-middle attack and malicious software. Therefore, in this paper we proposed the multicast key management in multimedia broadcasting service environment. Our protocol provides a security and efficiency in the next-generation of multimedia broadcasting service environment.