One of the dirty secrets of the legal industry is the concept of "exposure." It means how likely you are to be sued by someone, and how likely it will end up costing you loads of money.
In the scenario you described, I'd say your exposure was zero, meaning not to worry about Joe Six. Now, if you were Steven Spielberg then Joe Six (and his lawyer) would probably figure you are loaded and come after you. Conversly, if Joe Six actually turned out to be Joe Pesci, he might come after you (and not just with his lawyer).
So, no responsible person would condone or encourage you to break the law. But you got me instead, the realist. Bottom line: Joe Six CAN "come after you" but it's not likely he will, and if he did, you would get a letter telling you to cease and desist before appearing before any judge.