
While this might seem like a hassle, it's actually not too difficult to set up. Apple requires iTunes to authorize your system to play MP4 files due to its Fairplay system. You can think of it as an extra layer of security for your audio files. What this means is that in order to play the file, you need to first authorize your computer using Apple iTunes. The best thing about MP4 files is that they are a protected file type and incorporate the DRM system (Digital Rights Management). MP4 is a file format that is an extension of the MPEG-4 Part 14 file format - otherwise known as MP4. Amongst all of the different types of audio files, MP4 might be one that you're not as familiar with.
