You should take a look at taking them to small claims, and ask for the funds back. The company may just crater and pay it. If they answer, you can then go get an attorney, and claim attorney fees too, which can be awarded and go over the usual $10k limit.
I'd write a certified letter to the hospital and demand the funds back, or their justification for their action. If the hospital does not respond, then take it to the small claims court nearest to it. This won't cost much. and you'll at least get an answer.
Sue him for fraud. If someone is attempting to use these documents against you in some way, you'll want to sue for a declaratory action that their claim is not valid. But first let them know that you are claiming that the documents have been forged. That company will be MUCH more likely to let it go if are suing the title company and its vice president. You can even ask that organization to join you as plaintiffs.
Your question suggests that you need to visit with a local attorney about your intellectual property needs. You are looking for a trademark, not a copyright, but you probably have a number of issues that need to be examined.
You're probably okay. Everything sold is composed of other things. Your question stems from the fact that most people don't buy plates to create art, but artists purchase frames and all manner of items to create their art. What you don't want to do is make it look like the plate manufacturer is the source of the artistic work. Probably best to talk to an attorney.