Jonathan Lethem has started something he calls the Promiscous Materials Project.
These stories are for filmmakers or dramatists to adapt. They’re available non-exclusively -- meaning other people may be working from the same material -- and the cost is a dollar apiece.
There’s a simple written agreement to sign, which imposes a couple of restrictions, and that's it -- once you've paid your dollar and signed the agreement, you're free to adapt or mutate the story as you please.
Open source philosophy applied to literature. Muy bueno!
I guess it's unnecessary to mention that he's a genius author too? If in doubt, check out Motherless Brooklyn.