m4p2mp3 — helper to turn an iTunes protected M4P to an MP3, so I can play music I have bought on my MP3 player. Probably runs best on a Unix-like OS.
You will need Perl, some M4Ps, mono, FairKeys, DeDRMS, faad, and lame. You’ll need to edit the script to say where the DeDRMS.exe file is. You’ll need to have run FairKeys to pick up your account details from Apple’s server.
Does the conversion via WAV, so you’ll definitely lose something. As written, MP3 file sizes are about 15% larger than the M4P. Doesn’t handle invalid MP3 genres gracefully at all; there is the beginnings of a mechanism to do this in the code, though.
This script doesn’t know anything about decryption, and thus contains no code to circumvent DRM.