M4V, M4V file format, developed by Apple, is a video container optionally protected with Digital Rights Management (DRM) copy protection to protect privacy or copy. Videos and audio tracks are wrapped around by container files to indexing and organizing playback streams. In addition, containers also provide the feature of chapters similar to those on DVDs. Apple uses M4V to encode videos in its iTunes Store. It protects unauthorized reproduction through Apple’s FairPlay copy protection by allowing M4V files to be played on only authorized computers having the accounts used to purchase the video. However, if DRM-protection is removed from M4V files, these files can be played in other video players by changing the extension from .m4v to .mp4, which is why M4V files are associated with MPEG-4. M4V uses H.264 for video and AAC and Dolby Digital for audio encoding and decoding.
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