DRM is a term used to describe technologies used for the copyright protection of digital content. Secure documents are encrypted with permissions information and controls that have minimal impact on authorized users of the documents. There are two broad approaches to DRM:containment, typically encrypting content so that it can only be accessed by authorized users; and marking, inclusion of a 'flag', watermark or tag to signal to a device that the content or medium is 'copy protected'.
Restriction can be hardware or software based. Many DRM schemes are vendor or publisher specific. A consumer might accordingly end up with several incompatible DRM implementations on a single device, some potentially conflicting with each other.
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