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Play This Thing! | Game Reviews | Free Games | Independent Games | Game Culture: "Which is why we have Pathfinder. Pathfinder is not D&D 3.5 because it says so, and because it doesn't have the D&D logo on it and because it uses different words in different arrangements to describe a game system that, well, gosh darn, what do you know, perhaps by sheer coincidence, is remarkably, even amazingly similar to D&D 3.5. Thus, it avoids violating both trademark and copyright law; copyright covers 'the tangible expression of an idea' not 'an idea,' so this is perfectly legal, and anyway, it's published under an Open Gaming License for D20 products, so it would be doubly hard for WOTC to *** about it to the law."