PlayReady drm

http://download.microsoft.com/download/A/B/D/ABD25A10-5315-4B5C-BDA3-5B5A8A84AECF/PlayReady_Overview.doc

http://en.wikipedia.org/wiki/PlayReady
https://visualstudiogallery.msdn.microsoft.com/e02ccac7-f3eb-4b53-b11a-c657d5631483