BMaC
Adventurer
They are a HEAVY HITTER.
IANAL but the tl;dr appears to be: Hasbro can revoke OGL 1.0a, but also that publishers can write D&D compatible material without it but may get sued by Hasbro.
www.eff.org
IANAL but the tl;dr appears to be: Hasbro can revoke OGL 1.0a, but also that publishers can write D&D compatible material without it but may get sued by Hasbro.

Beware the Gifts of Dragons: How D&D’s Open Gaming License May Have Become a Trap for Creators
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.
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