The idea for a game is not protected by copyright. The same is true of the name or title given to the game and of the method or methods for playing it.
Copyright protects only the particular manner of an author’s expression in literary, artistic, or musical form. Copyright protection does not extend to any idea, system, method, device, or trademark material involved in the development, merchandising, or playing of a game. Once a game has been made public, nothing in the copyright law prevents others from developing another game based on similar principles.
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В общем, не считая тетриса, механика игры не может быть авторской собственностью. Законом защищены только медиа.