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ISO/IEC 14476-5:2008 defines a protocol for N-plex multicast transport over the Internet where IP multicast is supported. It provides the mechanisms of session control and error control. For session control, one participant is designated to manage creation/termination of a connection; join/leave of a participant; and tokens which allow the specific participants to send data. For error control, it provides the mechanisms of tree-based loss recovery; control tree construction with two-layer logical tree; and logical tree adaptation with packet delivery status. ISO/IEC 14476-5:2008 specifies the protocol details such as packet format, procedures, and parameter values. This protocol can be used for the applications which require many-to-many reliable data delivery service.