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Chapter 3. Object Description and Synchr... > Semantic Description and Access Mana...

3.2. Semantic Description and Access Management

The previous section detailed the essentials of MPEG-4 stream description necessary to enable simple content access. In addition, there are auxiliary streams and descriptors providing a little more semantic information about media objects and enabling content access management in order to prevent unauthorized content distribution and use. Two major types of auxiliary streams are defined in MPEG-4 Systems—OCI streams and IPMP streams. The intent of OCI is clear: It provides what is called metadata, describing objects semantically. IPMP provides hooks to control the legitimate usage of MPEG-4 content.

3.2.1. Object Content Information: Meta Information About Objects

A set of descriptors and a stream type have been defined to carry information about the media object in general: OCI descriptors and OCI streams. The following OCI descriptors are available [MPEG-4-1, Clause 8.6.18]:


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