Game System License
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.
A System Reference Document (SRD) of the 3rd edition of D&D had been licensed under the Open Game License (OGL). The OGL is a copyright license, allowing the use of copyrighted text created by others in one's products. Also released at the same time was the d20 System Trademark License, allowing third-party publishers to indicate compatibility using a system logo, but not allowing the use of the D&D trademark.
The GSL, however, grants use of the 4th Edition System Reference Document, which lists trademarks, words, and short phrases that could be used to refer to materials in the Dungeons & Dragons 4th edition rules, but contains no rules itself. People wishing to use this license are also granted a logo that must be placed onto their products to state that they are compatible with Dungeon & Dragons 4th Edition. The license also can be updated by Wizards of the Coast and updates affect all licensees; in case of litigation the licensees must pay the legal costs of Wizards of the Coast.
Prior to Gen Con 2008, it was announced that the GSL was undergoing a revision. Shortly after the end of the convention a number of Wizards of the Coast's jobs were eliminated, including the Licensing Manager position that was held by Linae Foster.
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.