I was answering parent's claim for refund policy. I haven't really encountered a game with DRM yet. EDIT: Yeah, it seems some multiplayer games need serial key

I was answering parent's claim for refund policy. I haven't really encountered a game with DRM yet. EDIT: Yeah, it seems some multiplayer games need serial keys to play multiplayer on their servers. You can't blame GoG for providing serial to multiplayer mode of a game. Single player should work without serial though. The benefits it brings (no serial typing) compared with faults (overloading servers and allowing bots) and costs (huge to re-implement server from scratch), just make it virtually impossible.