Extended Rights Markup Language
= a Rights Expression Language for the management of 'digital assets'
XrML is the basis for the REL of the MPEG-21 multimedia framework. It focuses on the license through which a rights holder confers usage rights to a consumer. A license can be digitally signed by the rights holder, now also referred to as the issuer, to confirm that the holder grants the rights contained in the license. An XrML license contains one or multiple grants and the license issuer. A grant is the element within the license that authorizes a subject to exercise a right on some object under some constraints."