Someone found a way to get around the Content Protection for Pre-recorded Media (CPPM) for DVD Audio by making a patch that uses WinDVD:
It was not long ago that DVD-Audio playback software came to the PC. For example Creative's SoundBlaster Audigy 2 comes with a DVD-Audio as well as WinDVD 's DVD-Audio add-on. So, rather than try to compromise the DVD-Audio's encryption itself, someone has succeeded in making a patch that uses WinDVD to perform the decryption and playback, but instead pipes the decrypted audio output to the hard drive instead of the sound card. The patch which includes several tools requires WinDVD 5, 6 or 7 to work.