Basicly, as the original creator you explicitly own the copyright to it. Dont let him offer you a royalty fee, tell him how much you want! Assuming he is printing your design on a t-shirt and selling it for $20, he's going to be making at least $10 form each sale. depending on the size of his operation he could be selling upwards of 10 a week so thats $100 a week off your back! if you think $5 is enough for all your hard work then fine but I would but in a demand for closer to $600.
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