The Game System License is a license that allows third-party publishers to create products compatible with and using the intellectual property from the 4th edition of Dungeons & Dragons (D&D). It was released to the public by Wizards of the Coast (WotC) on June 17, 2008. With the release of the 5th edition of D&D in 2014, and the release under the OGL of an SRD for that edition, the GSL fell into disuse, though it remains the only license for 4th edition.