Sony licenses Microsoft's PlayReady DRM
 

No one really likes DRM, but until Hollywood realizes what we already know -- it is more trouble than it's worth -- it is a fact of life for those who wish to enjoy premium content at home. And in the world of DRM, when it comes to digital distribution, there are two giants; Apple's FairPlay and Microsoft's PlayReady. But while Apple doesn't license its technology to anyone, Microsoft is more than happy to add a name to its long list of licensees.

http://hd.engadget.com/2011/03/19/so...playready-drm/