Lessig has made some comments about DRM in his blog, particularly about Sun’s project to create some open DRM formats with their Open Media Commons Project. Seems like Karl-Friedrich Lenz was right all along about this specific point. I tend to agree that it should be possible to build some DRM systems that protect copyright exceptions in some way or another. I have also argued that there is considerable room for a wide definition of DRM that includes all sorts of digital rights management.
Then there is this interesting article about the folly of some technical protection strategies from the industry. The fact is that restrictive TPMs have never stopped widespread piracy, they only annoy and affect fair dealing provisions.