Mark Russinovich is a brilliant guy and likely not so popular with the people at Sony these days.  Mark was testing out some root kit detection and removal software and discovered that in their exuberance to implement Digital Rights Management Sony has created a very ham handed solution that behaves more like a rootkit than some of the very worst actual rootkits out on the Internet.

Read Mark’s Blog which details his discovery or go to theregister.co.uk article that summarizes it.  Good reading about bad code!