License question for dungeon dragon like game [closed]

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I want to create a dungeon and dragon based games. Basically, I want to take the rules and some basic aspects of the game. I have some old dungeon dragon handbook notes. I won't be able to recreate the entire system (version 4 of dungeon dragons) but will I be breaking any license if I do that.

I figure that the concept of dungeon and dragons has been used in RPGs for decades.

And this is kind of a general license question? Are ideas such as this copyrighted?

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I know some of WOTC's stuff is part of the OGL, which means anyone can use it, that, I think, includes the d20 system, you'd have to look in the books to see what particular elements are under a private license