Greetings
I just uploaded to RareWares a tool that enables WinDVD owners to rip full quality DVD-Audio tracks encrypted with CPPM.
It does so by launching/patching WinDVD 5/6/7 and redirecting the stream to disk instead of the sound card after decryption.
Check it out:
http://www.rarewares.org
Best regards;
Roberto.
PS: I didn't test it, as I don't have any DVD-Audio disk, so please don't flame me too hard if it turns out not to work :P