The creator of Garry's Mod has revealed that he intentionally added an error message to the commercial version of the mod, which only appears in pirated versions of ...
Gaming The Web Garry's Mod developer exposes pirates with fake error By Matthew DeCarlo April 13, 2011 at 5:23 PM 39 comments ...
This is pretty great. You know Garry’s Mod, right? It’s basically a sandbox “game” built on the Source engine. It’s only $10, but apparently there are people out there who feel the need to pirate it.