"Perhaps the most notable example of traitorware was the Sony rootkit. In 2005 Sony BMG produced CD's which clandestinely installed a rootkit onto PC's that provided administrative-level access to the users' computer. The copy-protected music CD’s would surreptitiously install its DRM technology onto PC’s. Ostensibly, Sony was trying prevent consumers from making multiple copies of their CD’s, but the software also rendered the CD incompatible with many CD-ROM players in PC’s, CD players in cars, and DVD players. Additionally, the software left a back door open on all infected PC’s which would give Sony, or any hacker familiar with the rootkit, control over the PC. And if a consumer should have the temerity to find the rootkit and try to remove the offending drivers, the software would execute code designed to disable the CD drive and trash the PC. "

That's some scary shit.