Yes. The artwork is copyrighted to you. It is often a good idea to register the copyright. These guys may say that you gave permission to use the art, which is their defense. You say you had a deal, which you did, so they should stop using the art or pay you. You can tell them that the art belongs to you and that our permission was terminated when they dissolved the partnership and did not pay you.
This means that you can sue them for copyright infringement. That will cost you some money to do though. How much? Well into the thousands. So you have to decide if it is worth it to sue them, or find a lawyer who will do it on a contingency basis.
There is an interesting article on this that lays out the law and procedures. Let me see if I can find it ...
Read through this for a omplete review of the law and your options. You can register the art and then go after them for infringement.
Hope this helps you Jim. These guys should honor their committment to you. They did not pay as promised and they are stealing your work.
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Thanks Jerry for the helpful information.
Now that I know that I am in the right, I will start with a Demand letter and see where that goes.
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