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"Digital rights management" Definition:
Digital rights management (DRM) is a generic term that refers to access control technologies used by hardware manufacturers, publishers and copyright holders to limit usage of digital media or devices. Whereas copy protection only attempts to prohibit unauthorized copies of media or files, digital rights management allows the issuer of the media or file to control in detail what can and can not be done with a single instance. For example, an issuer can limit the number of viewings, number of copies, which devices the media can be transferred to etc. Digital rights management often depend on cryptography and on-line activation. Blu-Ray and some recent game titles by Electronic Arts are an example of each. Digital rights management has been and is being used by content provider companies such as Sony, Apple Inc., Microsoft and the BBC.
(This definition is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Digital rights management".)

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