BS ISO/IEC BRITISH STANDARD 21000-5:2004 Information technology - Multimedia framework (MPEG-21) 一 Part 5: Rights Expression Language ICS 35.040 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTL British Standards BS IS0/IEC 21000-5:2004 National foreword This British Standard reproduces verbatim IS0/IEC 21000-5:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee IST/37, Coding of picture, audio, multimedia and hypermedia information, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled "International Standards Correspondence Index", or by using the “Search" facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO/IEC title page, pages ii to ix, a blank page, pages 1 to 121 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication This British Standard was published under the authority Amd. No. Date Comments of the Standards Policy and Strategy Committee on 5 April 2004 @ BSI 5 April 2004 ISBN 0 580 43595 4 BS IS0/IEC. 21000-5:2004 INTERNATIONAL ISO/IEC STANDARD 21000-5 First edition 2004-04-01 Information technology Multimedia framework (MPEG-21) - Part 5: Rights Expression Language Technologies de I'information — Cadre multimédia (MPEG-21)- Partie 5: Langage d'expression des droits Referencenumber ISO/IEC 21000-5:2004(E) ISO IF( BS ISO/IEC 21000-5:2004 ii BS IS0/IEC 21000-5:2004 Contents Page Foreword .vili Introduction. ..ix 1 Scope. 2 Normative references... 1 3 Terms, definitions, symbols, and abbreviated terms . 4 Namespacesandconventions. 4.1 Namespaces.... 4.2 Namespace conventions .... 4.3 Speciai typographical conventions.... 4.4 XML structural notation conventions.. 4.5 Authorization context conventions .. 5 Authorization model.. 5.1 .8 5.2 Authorizationreguest .9 5.3 Authorization context... 5.4 Authorization story... 10 5.5 Authorizer......... 5.6 Authorization model authorization context properties.. 10 5.7 Authorization proof.... 1 5.8 License Semantics ....... 12 6 Architectural concepts.. 12 6.1 Equality........ 12 6.2 License syntax 12 6.3 License parts .... 12 6.4 License issuers.. 6.5 Variables. 14 6.5.1 Variable definition 14 6.5.2 14 6.6 Conceptually abstract elements and types 6.7 Revocable... 15 6.8 Principal surpassing .... 15 6.8.1 6.8.2 Principal set representation. 15 6.9 Derived grants and grant groups.. 15 6.9.1 15 6.9.2 One-step-derived grants and grant groups 6.10 Encrypted Elements... 17 7 Core.. 17 7.1 General 17 7.2 Core authorization context properties 17 7.3 General core elements and types ... 18 7.3.1 License... 18 7.3.2 LicenseGroup 20 7.3.3 .20 7.3.4 DelegationControl.. 20 7.3.5 NonSecureReference..... 21 7.3.6 21 7.4 Core conceptually abstract elements and types 21 7.4.1 21 ii BS IS0/IEC 21000-5:2004 Contents Page Foreword .vili Introduction. ..ix 1 Scope. 2 Normative references... 1 3 Terms, definitions, symbols, and abbreviated terms . 4 Namespacesandconventions. 4.1 Namespaces.... 4.2 Namespace conventions .... 4.3 Speciai typographical conventions....