Generally, the files purchased from iTunes store are protected by using Apple’s FairPlay DRM copy protection aiming to restrict piracy and unauthorized distribution of the files, which means that the protected files cannot be played on non-Apple devices. Due to its great compression and low-bandwidth requirement, it is one of the most popular video container format streaming on the internet. Its usage is limited to Apple products only (iPhone, iPod, MacBook, iTunes store etc.) to support video files.
for encoding video files in its iTunes store. M4V, a video file container format developed by Apple Inc.
