(1). iTunes AAC music are in DRM copyright protected M4P and Non-DRM m4a file
(2). You can directly convert those m4a to other audio format with footbar 2000, winamp, etc for Non-DRM itunes songs
(3). Apple's ipod, iPhone iPad can play itunes m4p, however, if you get a non-apple media player like PSP, PS3, Xbox 360, Sansa Fuze,  Archos, Blackberry, Galaxy tab, Sonywalkman, HTC, Sansa, Kindle Fire,  you are not authorized to play them.

Tools we need to convert protected aac to mp3 format - aimersoft Protected Music Converter, the key features of this superb music conversion tool are

(1). Remove DRM from protected music files like AAC WMA M4P iTunes songs imesh napster rhapsody bearshare, etc then you steam drm music to all portable device without problem.
(2) It also can convert drm and common audio like AAC MP3 M4A, WMA, AC3, OGG, APE, WAV, MKA. so that you can play and share music in any media player you like.