Going that way, a government official could copyright the idea that a bridge should be built at a certain point on the river and demand royalties when someone else builds the bridge there, which makes no sense.
Thus ideas without implementation cannot be owned because it is not practical. Sure, Rowling may own the Harry Potter franchise but I'd say it'd be impossible to prove or deny that through the entire history of fiction books someone else hadn't come up with the idea before her, threw it in a trash can and moved to something else because he didn't think the idea had merit.
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