Rights Expression Language is a machine-readable language used in digital rights management. REL can support consistency and reliability among different systems and services. Also, it can guarantee end-to-end interoperability, enabling different systems to work together.RELs main function is to define licenses, meaning to define permission and restrictions with regard to how the content of documents may be used.
Rights Expression Language (REL) features the flexibility to support multiple business models, richness and extensibility for digital rights management. It facilitates the identification and association of digital rights to digital content.Most RELs are expressed in XML but any format can be used including simple text. They are usually embedded as metadata (data such as creation date, language used, tools used to create the media, etc...) in documents such as MP3 audio, downloaded video or e-books.Examples of notable RELs include open digital rights language (ODRL), creative commons REL (ccREL), and moving picture experts group (MPEG-21). A common REL seen online is the GDFL Which is a General Free Documentation License allowing users free permission to copy and distribute a work which is often subject to "copyleft" the recently made popular opposite of copyright.
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