Beware the Gifts of Dragons: How D&D’s Open Gaming License May Have Become a Trap for Creators
www.eff.org
The company that owns Dungeons and Dragons (D&D) is planning to revoke the open license that has, since the year 2000, applied to a wide range of unofficial, commercial products that build on the mechanics of the game.

One of the more informative posts on the current OGL curfluffle, from the Electronic Frontier Foundation, written by Kit Walsh, both a senior staff attorney at the EFF and designer of Nebula- and Ennie-winning RPGs.