http://m4p-to-mp3-converter.com/
For Mac users,easily convert iTunes M4P files to plain MP3, AAC, Apple Lossless, AIFF, or other formats ready for use on any computers or mobile music devices such as iPod, iPhone, PSP, Zune, cell phone, MP3 player and car MP3 CD players, etc. It is a handy M4P to MP3 conversion for Mac OS X. This video will show how to convert M4P to MP3 on Mac.