The MPEG-21 standard, from the Moving Picture Experts Group, aims at defining an open framework for multimedia applications. MPEG-21 is ratified in the standards ISO/IEC 21000 - Multimedia framework (MPEG-21).

MPEG-21 is based on two essential concepts:
* definition of a Digital Item (a fundamental unit of distribution and transaction)
* users interacting with Digital Items

Digital Items

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