There quite a shockwave going through the blogosphere about rootkit like software that is installed when you try to run certain Sony CCCDs on your Windows machine. Sysinternals has the technical details, and good insights can be found in the Slashdot comments. I especially liked this one, as it hits the nail right on the head:
My refrain to the copyright holders: The people being hurt by this DRM software are people who have already communicated their intent to do the right thing by purchasing the CD. Sony has just guaranteed that a lot of people will never make that mistake again.
Note that Japanese consumers do not seem to be affected by this problem: last year, Sony stopped distributing CCCDs on the Japanese market.