Windows expert Mark Russinovich discovered a very nasty surprise left behind by a “protected” Sony music CD:
The entire experience was frustrating and irritating. Not only
had Sony put software on my system that uses techniques
commonly used by malware to mask its presence, the software is
poorly written and provides no means for uninstall. Worse, most
users that stumble across the cloaked files with a RKR scan
will cripple their computer if they attempt the obvious step of
deleting the cloaked files.