Open Game License
PUBLIC COPYRIGHT LICENSE FOR TABLETOP ROLE-PLAYING GAMES OF 2000
OGL System; Open Game Licence; Open gaming license; Open Gaming License
The Open Game License (OGL) is a public copyright license by Wizards of the Coast that may be used by tabletop role-playing game developers to grant permission to modify, copy, and redistribute some of the content designed for their games, notably game mechanics. However, they must share-alike copies and derivative works.