Files with the .m4v file extension are MPEG-4 files. These files contain digital videos that are downloaded from the Apple iTunes store.
The M4V files that are available from the online store can contain movies, music videos, TV shows etc. M4V files are nearly identical to MP4 files, but M4V files can be copy-protected by Apple using their proprietary copy protection technology. This prevents users from sharing files that they must pay for. The files can only be played on the computer where the purchase was made.
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