Mark Russinovich is one of those people you can really call a Windows guru. The way this guy disects the internals of an OS are amazing. He has built a number of tools that aid him in figuring out exactly what is going on under the hood and makes them publicly available on http://www.sysinternals.com. He often writes articles about his experiences and has one such experience with Sony's DRM software that is installed with their copy protected CD's.
Check it out.
