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the data and still produce a syntactically correct MPEG-4 bit stream. To provide tools to solve this problem, MPEG-21 includes an Intellectual Property Management and Protection (IPMP) element. MPEG-21 is an initiative aimed at standardizing media transactions or relationships between two media users. Users can be people, like content producers and consumers, for example, or machines, such as media publishing points and content subscriber/aggregators. In short, MPEG21 is an open framework for the delivery and consumption of media. The vision for MPEG-21 is to define a multimedia framework to enable transparent and augmented use of multimedia resources across a wide range of networks and devices. MPEG-21 goes far beyond mere rights management. It is a media commerce facilitator, as well as a framework for many other media access applications. MPEG-21 standardizes the flow of media information and services all the way along the delivery and value chain, from content creators to end-users. To support this, the content has to be identified, described, managed, and protected. Transport and delivery of content will occur over a variety of networks, between a variety of machines and devices (e.g., servers and players). Events will occur and require reporting. Reporting will include reliable delivery, management of personal data and preferences (respecting privacy), and the management of (financial) transactions. The overarching goal is to provide a framework to ensure that systems delivering multimedia content are interoperable (so that providers can buy components from any vendor they choose) and that transactions are simplified, unambiguous and, ideally, automated. The seven key elements defined in MPEG-21, shown in Figure 2.22, are:
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Digital Item Declaration A uniform and flexible abstraction for declaring (i.e., announcing the existence of) digital items. Digital Item Identification and Description A framework for description and identification of any entity, regardless of its nature, type, or granularity (you should, for example, be able to identify a full movie, a scene, or an individual shot, for example). Content Handling and Usage Providing interfaces and protocols that enable the creation, manipulation, search for, access, storage, delivery, and reuse of content across the content distribution and consumption chain. Intellectual Property Management and Protection Enabling content to be persistently and reliably managed and protected across a range of networks and devices (digital rights management, in other words).
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e.g. "Container" "Item" "Resource"
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Figure 2.22 MPEG-21 interactions.
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e.g. Unique IDs, Content Descriptors
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e.g. Storage Management, Content Personalization, Localization
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Content Management and Usage
Transaction / Use / Relationship
<Digital Item>
<Authorization / Value Exchange>
User A User B
Intellectual Property Management and Protection
e.g. Encryption, Authentication, Watermarking, Fingerprinting
Terminals and Networks
e.g. Resource Abstraction, Resource Management, Quality of Service
Content Representation
e.g. Natural, Synthetic, Scalability
Event Reporting
Terminals and Networks Providing interoperable and transparent access to content across a variety of networks and terminals (e.g., servers and players), including control over quality of service. Content Representation How media resources are represented. Event Reporting Including the metrics and interfaces to enable users (at all points in the delivery chain) to understand precisely the performance of all reportable events within the frameworks (e.g., did my streaming media ad really get watched ).
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As part of the standard, a Rights Data Dictionary and Rights Expression Language will be specified. MPEG-21 is a work in progress, but is highly relevant to streaming media, since without standardization, digital rights management has been nonexistent or implemented with proprietary and closed schemes. This has severely limited content providers interest in the medium and end-users ability to receive and play any media they want. When MPEG-21 is finalized, some time in 2003, applications to streaming media will provide interoperability between media delivery systems, so that media played from a compliant server can be viewed on any compliant playback device, ensuring that the rights of the end-user and content owner are not compromised at any point in the transaction. This standard will provide the breakthrough needed to take streaming media to the majority of consumers. It is a standard highly significant for the future viability of streaming media. MPEG-21 will also unify media delivery via broadcast television networks, satellite systems, terrestrial digital radio, Internet streaming platforms, and wireless networks. The rules and descriptions will be the same, no matter what the media and the delivery route. For the home media gateway, this technology will enable end-users to see a single pool of media, available for playback on any device with the right playback capabilities for a given media type. Billing and licensing will also be unified and simplified. Rather than establishing agreements with several television channels to watch all the content available to you, as is often the case with satellite-delivered television content today, the end-user will ultimately be able to access and pay for any content he or she can locate, with the transaction to obtain and pay for licenses handled transparently by a single transaction engine in a user s device. Television, as we know it, will be nothing more than a source of media and a delivery mechanism, equivalent to all other media sources and delivery networks, from the point of view of the end-user. Prime-time television shows will be competing for audience share head-to-head with all other streaming media presentations, offered to the end-user as equivalent choices on the same player. Bearing in mind that there are approximately 36 million Web sites in the world today and that as streaming media takes root, many of these will offer streaming content, this is a daunting prospect for even the most popular television show. Broadcast television operators, of course, would rather not compete on this basis, since they already have a more captive audience. They will, therefore, resist the move toward MPEG-21 compliance, in all likelihood. However, if an MPEG-21 driven media marketplace establishes
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