Wizards of the Coast published the Dungeons & Dragons 4th Edition Game System License (GSL) on June 17th, 2008. This page aims to list as many as possible links to online content related to the GSL.
GSL – Official content
17.06.2008 snapshot (local files)
Game Designers on the GSL
18.06.2008: Sean K. Reynolds: So … the GSL is now public (wizards.com/d20). And it’s very sad to see.