most of the bases on the download section most likely contains someone else's work that probably didn't agree on it being released with out their consent.
these days, everything is either stolen or leeched. unless you're building your framework from scratch. Chances are you're probably using someone else's work and you don't even know it.
OT: It's just how shit is, I'd just recommend making it open-source or releasing it when you're done working with it, since it'll probably benefit someone else and upon releasing it just give credits to anyone who's ever worked on it or has done significant work on it, best way to acknowledge credits to be honest.