Sysinternals' Mark Russinovich has performed an analysis of the copy restriction measures deployed by Sony Music on its latest CDs: which he bluntly calls a 'root kit'. Using conventional tools to remove Sony's digital media malware will leave ordinary users with Windows systems unable to play CDs.
http://www.theregister.co.uk/2005/11/01/sony_rootkit_drm/
http://www.theregister.co.uk/2005/11/01/sony_rootkit_drm/