Digital rights management (DRM) is a generic term that refers to access control technologies that can be used by hardware manufacturers, publishers, copyright holders and individuals to try to impose limitations on the usage of digital content and devices. The term is used to describe any technology which makes the unauthorized use of such digital content and devices technically formidable, but generally doesn't include other forms of copy protection which can be circumvented without modifying the file or device, such as serial numbers or keyfiles. It can also refer to restrictions associated with specific instances of digital works or devices. Digital rights management is being used by companies such as Sony, Apple Inc., Microsoft and the BBC.
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