This isn’t an issue with my system (none of my games use copy protection), but many users have had issues with “Starforce” copy protection.
THIS SITE: (http://www.glop.org/starforce/) has information on the Starforce copy protection and the issues it causes, along with a list of games that use the protection.
Basically, it installs its own kernel-level drivers without asking the user. This introduces security and stability issues to the system.
Most copy protections only hurt the user that paid for the product. Anyone who downloads a cracked copy never has the trouble the legit users have.
I recommend users boycott games that use copy-protection like this. It’s already annoying enough when a game does a “CD check”, but it’s just plain wrong to install extra software on the users’ system.