So you thought your monitor was the last bastion of freedom when it came to OS compatibility, huh?
Longhorn to Require Monitor Based DRM
"Engadget has an interesting article regarding a new feature in Longhorn entitled PVP-OPM (Protected Video Path - Output Protection Management) which detects the capabilities of the display devices you are using and manages how (and if at all) content is sent to it. In short, this means that if Longhorn detects that your monitor is not "secure" enough, then your premium video content won't play on it until you buy one that is. Who gets to decide? The content providers of course."