Transcript MPEG 21 – An Overview

MPEG 21 – An Overview
MUMT 611
Elliot Sinyor
January 2005
Contents
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Background/Motivation
Key Concepts
MPEG 21 Overview
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Digital Item Declaration
Digital Item Identification
Intellectual Property Management and Protection
Rights Expression Language and Rights Data
Dictionary
Digital Item Adaptation
File Format
Background/Motivation
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Work began in June of 2000 by MPEG (aka
ISO/IEC JTC1 SC29 WG11)
From the ISO Standard Document:
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“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.”
Key Concepts
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A way to encapsulate almost any type
of digital content.
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Packages data, meta-data, and metameta-data.
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Audio, video, text, software and any combination of
them.
How is this data viewed on a specific device?
Control the use of the data (DRM)
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ie. who can view it? What can they do with it?
Part 1 – Vision, Technologies
and Strategy
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Refers to the document itself
In other words:
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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
Part 1 – Vision, Technologies
and Strategy
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Achieve the integration of components and
standards to facilitate harmonisation of
'technologies' for the creation, modification,
management, transport, manipulation,
distribution, and consumption of Digital
Part 1 – Vision, Technologies
and Strategy
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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.
Part 2 – Digital Item
Declaration
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At the heart of it all: the “Digital Item”
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Examples:
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Music album
E-book
Software including setup and configuration
information
Resources, Metadata, Structure
DID defines abstractions related to the
construction of the digital item.
Part 2 – Digital Item
Declaration
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Non-exhaustive list of abstractions:
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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”
Part 2 – Digital Item
Declaration
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Non-exhaustive list of abstractions:
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Container
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Descriptor
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Statement
Item
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Component
Statement
Choice/Selection/Condition
 “to view this content, the condition is that you
made a choice of a certain selection”
Part 2 – Digital Item
Declaration
Part 3 – Digital Item
Identification
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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
Part 3 – Digital Item
Identification
Part 3 – Digital Item
Identification
Part 4 – Intellectual Property
Management and Protection
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Does not specify a particular DRM
scheme
Framework for retrieving and using
IPMP tools from various locations
Part 5 – Rights Expression
Language
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Machine-readable language to declare rights
and permissions
Four basic entities
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Principal
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Right
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what can the principal do?
 eg view once, copy, alter etc.
Resource
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Must be authenticated
Digital item, a service, information owned by a principal
(eg name or email address)
Condition
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eg “you must pay $2 to watch this movie once”
Part 5 – Rights Expression
Language
Part 6 – Rights Data
Dictionary
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Provides description for basic RLE terms
Allows for extension
Allows for mapping/transformation of
metadata from other
authorities/namespaces
Part 7 – Digital Item
Adaptation
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Purpose: to shield users from network
and terminal installation, management
and implementation issues.
Conceptually, consists of resource
adaptation engine and descriptor
adaptation engine
Part 7 – Digital Item
Adaptation
Part 7 – Digital Item
Adaptation
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Areas of Concern
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User Characteristics
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Terminal Capabilities
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Available codecs, hardware-related specs
Network Characteristics
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Preferences
Bandwidth, delay and error
Natural Environment Characteristics
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Eg illumination, auditory noise-levels
Part 7 – Digital Item
Adaptation
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Areas of Concern
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Resource Adaptability
Session Mobility
Part 8 – Reference Software
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Most recent specification need
Systems-related specifications in MPEG21
www.enikos.com – DI browser
Released Jan 21, 2005
Part 8 – Reference Software
Part 9 – File Format
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Can include still/dynamic data
Will borrow from MP4
Work has begun
Bibliography