.M4V file, MPEG-4 file extension used for videos downloaded from the Apple iTunes Store; include TV episodes, full-length movies, and music videos; similar to an .MP4 file, but may be copy-protected using Apple's FairPlay DRM copyright protection.
Unprotected M4V files may be recognized and played by other video players by changing the file extension from ".m4v" to ".mp4." But iTunes M4V files are DRM protected, if you want to play a protected M4V file, you need to convert M4V to unprotected ones, like MOV format.
MOV file, is a common multimedia format often used for saving movies and other video files; uses a proprietary compression algorithm developed by Apple Computer; compatible with both Macintosh and Windows platforms.
So M4V files to MOV conversion is important. M4V Converter Plus can do the job for you.
M4V Converter Plus is an all-in-one iTunes M4V Converter, it supports any video played on iTunes library. With it, you can convert M4V videos to MOV format in high speed and great quality.