Historical miniature wargames are typically designed to use generic models. It is generally not possible to copyright the look of a historical soldier. Anyone, for instance, may freely produce miniature models of Napoleonic infantrymen. A player of a Napoleonic-era wargame could thus obtain his models from any manufacturer who produces Napoleonic models at the requisite scale. Consequently, it is difficult if not impossible for a historical wargame designer to oblige players to buy models from a certain manufacturer. By contrast, fantasy wargames feature fictional warriors, and fictional characters can be copyrighted. By incorporating original characters into their wargame, a wargame designer can oblige the player to purchase their models from a specific manufacturer who is licensed to produce the requisite models. An example of this is Warhammer 40,000 which features many original characters who have a distinctive aesthetic, and Games Workshop and its subsidiaries reserve the exclusive right to manufacture models of these characters. Games Workshop models tend to be expensive because competing manufacturers are not allowed to offer cheaper copies of official Warhammer 40,000 models. While there's nothing to stop players using foreign wargaming models (generics or proprietary models from other wargames), doing so could spoil the aesthetic and cause confusion.