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Rules can definitely be protected, it is Mechanics that can't be. Hasbro definitely could protect the rules of D&D but they couldn't stop you from making a game that used the same six attributes (Strength, Dexterity, etc). They could prevent you from calling it anything to do with Dungeons and Dragons, or even from probably naming it Dungeons and Demons, as an obvious derivative, but the basic mechanics such as spellcasting and attacking cannot be prevented
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