The whole open source initiative has been going for less than a year. Video is next on the list after HD2xxx/3xxx 3d info, and that 3d work is very close to being finished. I expect to be able to start spending time on video hw within the next couple of months.
In order to obtain certification for our products, we are required to meet "robustness rules". If you want an example, do a Google search on "copp robustness" and click on the "view as html" link for the first hit. This is representative of the kinds of agreements we need to work within; this one happened to be easy to find and relatively short. If we comply with these requirements we receive a specific level of certification from MS, and the associated bits in the driver in turn enable the "secure environment".
Please take a read through the document then look at the "New Circumstances" section at the end. If we provide enough information to make it easy to get around the robustness requirements, that could trigger the "New Circumstances" provision, which in turn would either force us to redesign the DRM implementation or to stop selling the product. Do a Google search for "copp revocation" if you want to understand more of the details.
If it sounds like I'm painting MS as the bad guy here that is not my intention either. My understanding is that the content providers simply did not want DVD/HD/BD content to be playable on a general PC (unless you essentially built a dedicated DVD player into it, like the old DVD cards). MS, as I understand it, worked with other industry partners (such as Intel for HDCP) and proposed a set of rules under which the content providers would license their CSS/ACSS info to allow legal playback on PCs. If you pass the rules you get certification. We sign agreements committing us to certain levels of compliance and robustness in order to get MS certification, and PC manufacturers only purchase certified hardware.
Whether the results protect anything is irrelevant. Content providers make rules, MS provides implementation and certification rules to satisfy the content providers, and all the graphics vendors (yes, all, not just us) have to comply with those rules in order to get certification and sell our products.