OK, if you want a more detailed response, here you go. The DRM added in Vista is targeted at content formats that actually support DRM, primarily video and audio (although I suppose there could be some image format out there that supports DRM). But the file formats in use 99% of photographers have no DRM built in and are handled no differently under Vista than previous operating systems, just like MP3's still work without DRM in Vista or any other OS despite the fact that some new audio formats have content protection (iTunes, anybody?).
Formats like JPG, TIFF, PSD etc have no DRM support built into the file format, so if you think DRM is somehow coming into play, I would very much like for you to try to explain what exactly you are suggesting that Vista is doing with these files?
As for your network file copy test, that doesn't prove anything about DRM. There has been speculation about the cause of these slowdowns, but I've not seen any actual proof and it's more likely that it has to do with the new status dialogs. Besides, you'll get the same results regardless for the format of the files. Are you suggesting that ALL files undergo DRM in Vista? Do you have any idea how DRM actually works?
Lets also keep in mind that this thread was about printing. Even if Vista were to somehow try to prevent printing of DRM-managed files (and again, the file formats we use are not DRM-managed), don't you think this would affect more than just CS3 if it's something the OS is doing? Why are people not having the same problem in CS2, or QImage?
Jack may have a lot of posts and be a great photographer, but that doesn't mean he knows anything about operating systems at the API level, so yes when I see such wild speculation offered with no proof to back it up, I'm going to call it nonsense.
