DX VA — DirectX Video Acceleration — a new system and API for hardware acceleration of video steams. It's intended for high-performance hardware processing of video streams, HD-DVD resolutions inclusive. It also includes a content protection system that prevents its interception and modification when it's processed by CPU or GPU. Hardware acceleration can use special shaders executed by GPU. Protected data, transferred along general purpose buses, are encrypted and can then be decrypted by video cards on the hardware level. Moreover, it provides authentication system that checks drivers and drivers check accelerators. I wonder how efficient this system will be and how soon it will be hacked ;-)
