The idea of separation between DRM and the rendering layer is illogical. The dream of all DRM proponents is a leak-proof pipe between the encumbered media and your senses, lest you be able to rip a perfect copy.

For a concrete example, look at how deep the content protection system introduced in Windows Vista goes.

http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.html

The proposed Encrypted Media Extensions standard is merely an interface between browsers and systems such as this.