Honnestly, i haven't realy think about it.
Not a constraining one, but more something like :
Do what ever you want with it, but if you find a bug, please tell me, and if you use it in a project which has a lot of money, please, share a bit with opensource guys, don't be too greedy ^^
Do what ever you want with it, but if you find a bug, please tell me, and if you use it in a project which has a lot of money, please, share a bit with opensource guys, don't be too greedy ^^