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MPEG 21 – An Overview

MPEG 21 – An Overview. MUMT 611 Elliot Sinyor January 2005. Contents. Background/Motivation Key Concepts MPEG 21 Overview Digital Item Declaration Digital Item Identification Intellectual Property Management and Protection Rights Expression Language and Rights Data Dictionary

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MPEG 21 – An Overview

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  1. MPEG 21 – An Overview MUMT 611 Elliot Sinyor January 2005

  2. Contents • Background/Motivation • Key Concepts • MPEG 21 Overview • Digital Item Declaration • Digital Item Identification • Intellectual Property Management and Protection • Rights Expression Language and Rights Data Dictionary • Digital Item Adaptation • File Format

  3. Background/Motivation • Work began in June of 2000 by MPEG (aka ISO/IEC JTC1 SC29 WG11) • From the ISO Standard Document: • “The MPEG-21 vision can thus be summarized as follows: to define a multimedia framework to enable transparent and augmented use of multimedia resources across a wide range of networks and devices used by different communities.”

  4. Key Concepts • A way to encapsulate almost any type of digital content. • Audio, video, text, software and any combination of them. • Packages data, meta-data, and meta-meta-data. • How is this data viewed on a specific device? • Control the use of the data (DRM) • ie. who can view it? What can they do with it?

  5. Part 1 – Vision, Technologies and Strategy • Refers to the document itself • In other words: • Define a 'vision' for a multimedia framework to enable transparent and augmented use of multimedia resources across a wide range of networks and devices to meet the needs of all users

  6. Part 1 – Vision, Technologies and Strategy • Achieve the integration of components and standards to facilitate harmonisation of 'technologies' for the creation, modification, management, transport, manipulation, distribution, and consumption of Digital

  7. Part 1 – Vision, Technologies and Strategy • Define a 'strategy' for achieving a multimedia framework by the development of specifications and standards based on well-defined functional requirements through collaboration with other bodies.

  8. Part 2 – Digital Item Declaration • At the heart of it all: the “Digital Item” • Examples: • Music album • E-book • Software including setup and configuration information • Resources, Metadata, Structure • DID defines abstractions related to the construction of the digital item.

  9. Part 2 – Digital Item Declaration • Non-exhaustive list of abstractions: • Container • Groups items and or containers • Item • Component • Descriptor • Statement • Choice/Selection/Condition • “to view this content, the condition is that you made a choice of a certain selection”

  10. Part 2 – Digital Item Declaration • Non-exhaustive list of abstractions: • Container • Descriptor • Statement • Item • Component • Statement • Choice/Selection/Condition • “to view this content, the condition is that you made a choice of a certain selection”

  11. Part 2 – Digital Item Declaration

  12. Part 3 – Digital Item Identification • Unique, persistent ID for digital item • Done by using a URI (compact string used to identify a resource) • Link digital item (or part of it) to another description scheme, eg ISRC

  13. Part 3 – Digital Item Identification

  14. Part 3 – Digital Item Identification

  15. Part 4 – Intellectual Property Management and Protection • Does not specify a particular DRM scheme • Framework for retrieving and using IPMP tools from various locations

  16. Part 5 – Rights Expression Language • Machine-readable language to declare rights and permissions • Four basic entities • Principal • Must be authenticated • Right • what can the principal do? • eg view once, copy, alter etc. • Resource • Digital item, a service, information owned by a principal (eg name or email address) • Condition • eg “you must pay $2 to watch this movie once”

  17. Part 5 – Rights Expression Language

  18. Part 6 – Rights Data Dictionary • Provides description for basic RLE terms • Allows for extension • Allows for mapping/transformation of metadata from other authorities/namespaces

  19. Part 7 – Digital Item Adaptation • Purpose: to shield users from network and terminal installation, management and implementation issues. • Conceptually, consists of resource adaptation engine and descriptor adaptation engine

  20. Part 7 – Digital Item Adaptation

  21. Part 7 – Digital Item Adaptation • Areas of Concern • User Characteristics • Preferences • Terminal Capabilities • Available codecs, hardware-related specs • Network Characteristics • Bandwidth, delay and error • Natural Environment Characteristics • Eg illumination, auditory noise-levels

  22. Part 7 – Digital Item Adaptation • Areas of Concern • Resource Adaptability • Session Mobility

  23. Part 8 – Reference Software • Most recent specification need • Systems-related specifications in MPEG-21 • www.enikos.com – DI browser • Released Jan 21, 2005

  24. Part 8 – Reference Software

  25. Part 9 – File Format • Can include still/dynamic data • Will borrow from MP4 • Work has begun

  26. Bibliography

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