QUOTE(CiTay @ Dec 11 2006, 14:00)

... For example, the audio drivers aren't allowed direct hardware access anymore. This affects EAX/DTS/Dolby/AC3/etc. decoding via the soundcard, which is no longer possible. Creative is working on a so-called OpenAL wrapper as a workaround for EAX sound on their X-Fi soundcards, but all other hardware features will remain unused, it seems. They are all done by the CPU in software now. This is all to ensure that DRM can't be easily hacked.
Thanx for that Vista DRM clarafication. There is a lot of FUD out there.
When Vista beta 2 was installed on my computer, I had terrible skipping issue with the sound. I suspected k-mixer or whatever Vista uses because the kernal driver plugin for Winamp and foobar 2000 played skip free while WMP11 couldn't. So this is still software decoding but the faulty k-mixer was bypassed. Subsequent releases of RC1 and RC2 didn't have the problem.
Vista is such a resource hog already that it's a shame MS is breaking the advantages of direct hardware decoding. They figure the multiple core processors can handle it for the average PC user.
All the new Intel chips and most likely newer AMD chips also have the hardware DRM built in so Vista can enforce it to the point that it might not be worth the hassle for people to try and hack it.
I wasn't sure what level of DRM to expect from Vista so I tested a few of my everyday fair usage media/data copy/ripping/encoding/playing to test multimedia apps and purchased recordings. I am still also able to rip online mp3 streams to my hard drive.
Who knows what future Vista updates might do?