A large russian community named URF.im has a special way of protecting their maps from other people using them. These maps when loaded outside of their server will lack all doors, entities, have the spawnpoints set angled and have a blue fog that covers your view. However I'm assuming they have a script that fixes the map on their server.
If you have this script and it works I will pay handsomely. Either credits or whatever you want.
Garry's Mod Leaks