Sony install root kit

Possibly the most extreme example yet of DRM being actively evil, not merely a pain.
http://www.schneier.com/blog/archives/2005/11/sony_secretly_i_1.html
http://it.slashdot.org/article.pl?sid=05/10/31/2016223&tid=172&tid=158

http://www.theregister.co.uk/2005/11/01/sony_rootkit_drm/