The most POPULAR software for removing DRM protection:

WM RECORDER
the easiest audio/video stream ripper

WM CAPTURE - Super high quality on-screen video recorder.

SOUNDTAXI
remove DRM protection from Windows Media, iTunes music and video files

Other RECOMMENDED software and services:

• AUDIO/VIDEO STREAMING CAPTURE SUITE
  the best audio/video stream recording/capturing bundle
• REPLAY MUSIC
  the best streaming music recorder
  
  
• REPLAY MEDIA GUIDE
  free service to find and record online radio, Internet TV, podcasts
• AVS VIDEO TOOLS
  convert, split, join, remove commercials, edit, rotate, apply effects, capture, transfer, copy, rip and burn DVD and video files
• EMUSIC
  the best legal music download service
• AUDIBLE
  download audio books, audio magazines, newspapers, radio programs

QTFairUse 6 supports iTunes versions 6.0.4 to 6.0.5 and uses Apple's music and video player in the DRM-removing process.

QTFairUse 6 is available for Windows only. It requires Python 2.4 and runs in the command line.

You may download QTFairUse 6 from the following URL
rapidshare.de/files/31103061/QTFairUse6-1.0.zip.html

How it works: When you play AAC file with iTunes 6.0, QTFairUse 6 dumps individual AAC files from the memory before AAC decoding (so you get better quality compared to direct sound recording software).

Unfortunately while removing DRM protection QTFairUse 6 doesn't save any metadata. The resulting AAC file, doesn't seem to play in iTunes. It plays fine in QuickTime Player, but iTunes on the Mac side rejects it.

See also:

• How to remove copy-protection from iTunes AAC files
• Ask your question about QTFairUse in our forum