World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0000185636
Reproduction Date:

Title: Mpeg-21  
Author: World Heritage Encyclopedia
Language: English
Subject: MPEG-4, Delivery Multimedia Integration Framework, ISO base media file format, Multiview Video Coding, MPEG-4 Part 14
Collection: Digital Rights Management Standards, Metadata, Mpeg
Publisher: World Heritage Encyclopedia


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).[1][2][3][4][5][6]

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 can be considered the kernel of the Multimedia Framework and the users can be considered as who interacts with them inside the Multimedia Framework. At its most basic level, MPEG-21 provides a framework in which one user interacts with another one, and the object of that interaction is a Digital Item. Due to that, we could say that the main objective of the MPEG-21 is to define the technology needed to support users to exchange, access, consume, trade or manipulate Digital Items in an efficient and transparent way.

MPEG-21 Part 9: File Format defined the storage of an MPEG-21 Digital Item in a file format based on the ISO base media file format, with some or all of Digital Item's ancillary data (such as movies, images or other non-XML data) within the same file.[7] It uses filename extensions .m21 or .mp21 and MIME type application/mp21.[8]


  • Digital Rights Management 1
  • See also 2
  • References 3
  • Further reading 4
  • External links 5

Digital Rights Management

MPEG-21 defines also a "Rights Expression Language" standard as means of managing restrictions for digital content usage. As an XML-based standard, MPEG-21 is designed to communicate machine-readable license information and do so in a "ubiquitous, unambiguous and secure" manner.

Among the aspirations for this standard, that the industry hope will put an end to file sharing, is that it will constitute: "A normative open framework for multimedia delivery and consumption for use by all the players in the delivery and consumption chain. This open framework will provide content creators, producers, distributors and service providers with equal opportunities in the MPEG-21 enabled open market."

See also


  1. ^ ISO. "ISO/IEC TR 21000-1:2001 - Information technology -- Multimedia framework (MPEG-21) -- Part 1: Vision, Technologies and Strategy". Retrieved 2009-10-31. 
  2. ^ ISO. "ISO/IEC 21000-2:2003 - Information technology -- Multimedia framework (MPEG-21) -- Part 2: Digital Item Declaration". Retrieved 2009-10-31. 
  3. ^ ISO. "ISO/IEC 21000-3:2003 - Information technology -- Multimedia framework (MPEG-21) -- Part 3: Digital Item Identification". Retrieved 2009-10-31. 
  4. ^ MPEG. "About MPEG - Achievements". Archived from the original on July 8, 2008. Retrieved 2009-10-31. 
  5. ^ MPEG. "Terms of Reference". Archived from the original on February 21, 2010. Retrieved 2009-10-31. 
  6. ^ MPEG. "MPEG standards". Archived from the original on April 20, 2010. Retrieved 2009-10-31. 
  7. ^ ISO (2006). "MPEG-21 File Format white paper - Proposal". Retrieved 2010-08-20. 
  8. ^ ISO/IEC 21000-9 First edition, 2005-07-01, AMENDMENT 1 2008-10-01, Information technology — Multimedia framework (MPEG-21) — Part 9: File Format AMENDMENT 1: MIME type registration (PDF), retrieved 2010-08-20 

Further reading

  • Framework Overview
  • Part 1: Vision, Technologies and Strategy
    • ISO/IEC TR 21000-1:2004
  • Part 2: Digital Item Declaration
    • ISO/IEC 21000-2:2005
  • Part 3: Digital Item Identification
  • Part 4: Intellectual Property Management and Protection Components
  • Part 5: Rights Expression Language
  • Part 6: Rights Data Dictionary
  • Part 7: Digital Item Adaptation
  • Part 8: Reference Software
    • ISO/IEC 21000-8:2005
  • Part 9: File Format (.m21 or .mp21)
  • Part 10: Digital Item Processing, C++ bindings and Session Mobility
  • Part 11: Evaluation Tools for Persistent Association
  • Part 15: Event Reporting
  • Part 17: Fragment Identification for MPEG Resources
  • Part 18: Digital Item Streaming
  • Part 19: Media Value Chain Ontology (MVCO)
  • Part 20: Contract Expression Language
  • Part 21: Media Contract Ontology

External links

  • MPEG-21 Overview
  • MPEG-21 Resources section of the MPEG Industry Forum web site
  • MPEG-21 Multimedia Framework (Overview and State of the Art)
  • MPEG-21 Overview (blog)
  • MPEG-7/-21 Community Portal
  • MPEG-21 schema files
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.