Studio 397 and Valve have systems in place to detect file manipulation. Using an unlocker can lead to a permanent ban from official multiplayer servers or even a Steam account suspension.
In the strictest technical sense, a DLC unlocker is a piece of software—often a DLL injector or a Steam emulator (like Goldberg or SmartSteamEmu)—that tricks the game into believing the user owns the content. rfactor 2 dlc unlocker verified