This Is Not A Contract

It's up to you whether or not you want to do work with no contract.  I think artists do need to do work with no contract, because what we're motivated by is not money.  We're motivated by a need to express ourselves and to get our ideas out.  That's the motivation.  It turns out that when people like it they frequently will support you if you give them a means, but this is not a contract.

-- Nina Paley (3 May 1968-), American cartoonist, animator, and free culture activist, Youtube video "Copying Is Not Theft: Against Copyright Tyranny", 25 March 2011