Mark Russinovitch has discovered that DRM on a Sony CD installs a rootkit. Anyone purchasing one of these CDs gets some nasty "bonus" material. Thank goodness there are people out there shedding light on these things. Knowing that a CD has DRM is one thing, but DRM that installs a rootkit is a huge breaking of consumer trust.
I guess that at least on "respectable" (not any more) content company not only thinks it owns your computer; it actually "owns" your computer.