Has any third party person/group ever made and published a game that revolves around the d20 mechanic but is not derived from open game content? A d20 game that is similar to DnD but is not compatible with any of its editions?
Has anyone done this?
It's theoretically possible since the dice mechanic (roll d20, plus bonuses, vs. a DC) itself is not copyrightable and the opportunity for patenting a game like DnD is long gone back in the early days of Chainmail.
Does anyone know? I've been curious about this since discussion about copyright law popped up in the forums somewhat recently.
I've moved this thread to RPGs General Discussion where it is more on topic.
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