| http://www.w3.org/ns/prov#value | - However, the approach used in this system is limited by the media capabilities of the target format (PDF), i.e. this approach limits, to a single format, the number of media types that may be secured. [0009] One of the main considerations in the field of digital rights management (or DRM) is that of interoperability, i.e. a solution which allows arbitrary media content to be provided in a format t
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