Changes

While not directly related to disc copy protection, some MMO (Massively Multiplayer Online) games distributed on discs (like Aion, Guild Wars, and Overwatch 1) become unplayable once the game servers are shut down. The disc itself is useless. In these cases, the discs retain value only for [[Preservation_projects|historical preservation]] purposes. However some MMOs rendered are unplayable by server shutdown, enthusiasts may create and maintain private game servers to keep the games alive unofficially. See [[Preservation projects#Private Game Servers]] section for revived private game server projects.