IANAL: but with nothing signed, it's you're code I believe, since it's your original work. I suggest looking into copyright law. (This is why contractors must/

IANAL: but with nothing signed, it's you're code I believe, since it's your original work. I suggest looking into copyright law. (This is why contractors must/usually sign "work for hire" clauses, proclaiming that the work is made for the company they're contracting with)