Digital Rights Management (DRM) has been in use for many years, protecting films and music as well as document contents. Over time it has become more sophisticated. DRM protection has been extended to such concepts as the digital wallet. It has been recognized by International Law with the formation of the World Intellectual Property Organization and in the USA with the Digital Copyright Millennium Act (DCMA). DRM now incorporates proprietary formats such as Microsoft Word as well as International Standards such as PDF. It works by license specific capabilities rather than supporting exhaustion of rights because there is no sale, only a grant of a right. Learn more here.
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