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Open gaming is a movement within the tabletop role-playing game (RPG) industry with superficial similarities to the open source software movement.[1] The key aspect is that copyright holders license their works under public copyright licenses that permit others to make copies or create derivative works of the game.
A number of role-playing game publishers have joined the open gaming movement, largely as a result of the release of the original System Reference Document (SRD) by Wizards of the Coast, which consisted of the core rules of Dungeons & Dragons 3rd edition. Open gaming has also been popular among small press role-playing game and supplement authors.