Without licence you cant use source code(you can but its a hard gamble),I am selling my source code games,and giving licence on my behalf!!!
Price is 200$ per single and 400$ per multiple licence!!!
If you want from me to give you info on copyright agency to copyright your game, you can do it even for free,i can provide assistance and you will get your rights,but if someone else did copyrigted game before you,you are screwed then!!!
Message me for details