According to Wikipedia, there's a way around the copy protection. It doesn't sound very easy though.
DVD-Audio's copy protection was overcome in 2005 by tools which allow data to be decrypted or converted to 6 channel .WAV files without going through lossy digital-to-analogue conversion. Previously that conversion had required expensive equipment to retain all 6 channels of audio rather than having it downmixed to stereo. In the digital method, the decryption is done by a commercial software player which has been patched to allow access to the unprotected audio. The method is still in early stages, for example having problems with watermarked disks. As the DVD-A format has not gained wide commercial interest or acceptance, decryption tools are still very primitive.