Apple uses M4V to encode video files, such as TV episodes, movies, and music videos, in its iTunes Store. The copyright of M4V files may be protected by using Apple's FairPlay DRM copy protection. To play a protected M4V file, the computer needs to be authorized (using iTunes) with the account that was used to purchase the video. However, unprotected M4V files may be recognized and played by other video players by changing the file extension from ".m4v" to ".mp4". Under QuickTime, M4V video with FairPlay attached to it is identified as AVC0 Media.