I finished listening to Ian Dixon's The Windows Media Center Show #32 - DRM yesterday. Bob Weber of Strategy Kinetics, LLC and Marcus Matthias of Microsoft do an excellent job of laying out the basics of DRM, the problems, opportunities and future trends. This is a 'must listen' for anyone with a vested interest in the issues surrounding DRM.
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.