I am in the process of funding a developer to program the game I am designing. I was just wondering how does it work in terms of digital rights. I mean, if hypotetically I put the app on the google play store and it starts getting some visibility, what could prevent this person to put it in the google play store as well, or maybe re-sale the game source to somebody else? How does it usually work when you give the commission to an external programmer, to have full ownership of the game? Would I have them to send me a signed contract from their country, or anything complicated?