The differences between M4A and M4P.
The M4A format is the Audio-only MPEG-4 files. iTunes Plus tracks are encrypted and use .m4a accordingly. MPEG-4 audio files that include copyright protection, such as those sold through the iTunes Store, typically have an .M4P extension.
In January 2009, Apple announced that all music would be available in the iTunes Plus format, bringing an end to the sale of music with DRM on iTunes. It means that you are now available to transfer all your favourite music purchased from iTunes Store to your MP3 or MP4 players besides Apple's Media players iPod and iPhone.
iTunes M4A to MP3 Mac is the unique MP3 Converter designed for Mac users. Its powerful and professional function allows you to convert the unencrypted M4A music audios bought from iTunes Store to MP3 format for transferring to your MP3 or MP4 players like: Sansa, Sony Walkman , Zune, Creative Zen, etc. You are also allowed to burn the converted MP3 to CD or insert them in your Slideshow.
How to convert iTunes M4A to MP3 for MP3/MP4 players on Mac OS X?
1.Free Download and install the trial version of iTunes M4A to MP3 Mac.

2.Import M4A audio files.
Launch Mac M4A to MP3 and load M4A audio files from your iTunes with the application.

3.Specify the output file format and output folder.
Select MP3 as the output file format and Click "Browse" to choose a destination on your Mac to save the converted audio files.

4.Merge separate files.
Check "Merge into one file" to join the separate M4A audio files into one single files.
5.Converting iTunes M4A to MP3 Mac.
Start to convert the purchased M4A music audios to MP3 for your Sansa, Sony Walkman, Zune, Creative Zen.
