PC Stats has posted an article on Windows Vista, HDCP and Digital Rights Management

Part of the feature set of Microsoft's upcoming Windows Vista operating system is support for High-Definition content, either through television signals, HD or Blu-Ray DVDs, or Internet video. Along with this support though, is a new set of restrictions designed to ensure the sanctity of HD content and protect it from copying. Microsoft, as you might imagine, intends to support HD DVD and video on all its current operating systems, especially the upcoming Windows Vista. To this end, the company is building support for HDCP into the operating system as part of its suite of DRM (Digital Rights Management) abilities called Output Content Protection Management (OCPM).

Windows Vista, HDCP and Digital Rights Management