ISO/IEC TC JTC 1/SC 29

If a CA system wants to work in MPEG-2 IPMP, it should register a IPMP Tool ID. If the CA system is used to descramble the scrambled elementary stream, its tool ID should be included in the IPMP Tool List in IPMP Control Information. There should be an IPMP Descriptor (section 6.3.3) created for this CA system. ................
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