Micro Star v. FormGen Inc.

154 F.3d 1107 (9th Cir. 1998)

Duke Nukem 3D was one of the most popular "first-person shooter" games ever developed. Part of its success was based on how easy it was for regular players to create their own maps. Some gamers went so far as to create detailed instructions for others to follow. Even though the game was originally released in 1996, you can still download many of those files today. Micro Star went on to produce other map compilations for Duke Nukem 3D, including Nuke IT 1000, a collection of 1000 third-party maps.