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Hi Matt, thank you for your message, given you have no contract with the client about the intellectual property there is no agreement for them to have exclusive use of the code, therefore, I consider you would need to allow them to use the code as they have paid you for your time and it is clear that the purpose was for you to create the code for them to use they would need to be able to use it. You could however, keep the code for yourself to resell or reuse. I hope this helps, if you can please accept my answer and rate me 5 stars (in the top right of your screen) then Just Answer will credit me for helping you today.
Hi thank you for your message, I would say no you cannot refuse them. My reasoning is this that though there is no written contract there is nevertheless a contract has been formed in that you offered to do the work and they agreed to pay you for the work, you did in fact do the work and in consideration for that they paid you for the work. It was clear from the agreement between you that the work was for the code and the code would be used by the client. Hence in my view you cannot stop them using the code but what we cannot infer in this agreement made by the parties words and actions is a right for the client to have exclusive use of the code or retain the intellectual property hence, my earlier answer. I hope this helps, if you can please accept my answer and rate me 5 stars (in the top right of your screen) then Just Answer will credit me for helping you today.