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Concept
Rights Expression Language
Résumé
A Rights Expression Language or REL is a machine-processable language used to express intellectual property rights (such as copyright) and other terms and conditions for use over content. RELs can be used as standalone expressions (i.e. metadata usable for search, compatibility tracking) or within a DRM system.
RELs are expressible in a machine-language (such as XML, RDF , RDF Schema, and JSON). Although RELs may be processed directly, they can also be encountered when embedded as metadata within other documents, such as eBooks, , or video files.
Notable RELs include:
ccREL
An RDF Schema used by the Creative Commons project to express their licences.
This same vocabulary has also been adopted by the GNU Project to express their General Public License (GPL) in machine-readable form.
W3C Open Digital Rights Language ODRL
The W3C Permissions and Obligations Expression (POE) Working Group has developed the ODRL recommendations for expressing permissions and obligations statements for digital content.
The W3C ODRL Information Model offers a framework for the underlying concepts, entities, and relationships that form the foundational basis for the semantics of ODRL expressions. The aim of the ODRL Information Model is to support flexible Policy expressions by allowing the author to include as much, or as little, expressive detail about the terms and conditions for Asset usage, the Parties involved, and obligations.
The W3C ODRL Vocabulary & Expression describes the potential terms used in ODRL Policy expressions and how to serialise them. The terms form part of the ODRL Ontology and formalise the semantics. The wide set of terms in the vocabulary provides the support for communities to use ODRL as the primary language to express common use cases.
XrML
XrML began with work at Xerox in the 1990s. After passing through several versions and separate projects, it later formed the basis of the REL for MPEG-21.
MPEG-21
Part 5 of this MPEG standard includes a REL.
METSRights
METSRights is an extension schema to the METS packaging metadata standard.
Source officielle
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