Files that contain the .m4p file extension are audio files that have been downloaded from the iTunes Music Store onto a user's computer. M4P files are protected AAC files that use Apple's "Fairplay" DRM copy protection technology.
THE M4P file format limits the number of computers that a user can play a specific file on. If a user wants to play the M4P file on their computer, the computer must be authorized using the Apple iTunes application. A user can authorize up to five different computers using the same iTunes account.
If a user wants to play the file on more than five computers, he or she must create a second account. When doing so, they must purchase the song with that account, allowing another 5 computers to access the song.
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