nProtect Gameguard is a piece of software designed to prevent hacks from being used in games.
SecurityFocus has a warning about the program, which is bundled with
Lineage and Lineage 2.
To be honest, if you're expecting a really simple explanation… Well, there isn't one. If you're into technical
information though, the warning explains the problem in a great deal of detail. Grab a coffee/Mountain Dew, and read
on. And if technical stuff isn't your thing and bores you, grab a pillow and read on.
I'm not even going to attempt to sum the article up. After only three hours sleep, my eyes are already glazed
over.
Engadget
TUAW