DRM stands for Digital Rights Management, or as some people call it, Digital Restrictions Management. Put simply, DRM consists of various restrictions applied in music or video files, so their use (such as playback) can be controlled by a third party, usually the company holding the copyright for a song or movie. DRM is not just a copyright protection technique but a whole set of technologies that aim to implement the DRM strategy each distributor of digital content specifies. As an example, DRM can verify that the user that bought an audio file is actually the same user playing the file. DRM technology can also be used to limit the number of PCs a file can be played on. The major disadvantage of DRM is that these restrictions are not always clear when a user buys a digital product.