I read this earlier and was literally stewing while preparing dinner thinking about it. Who does ghetto business practices such as that?
I searched for you with respect to legal issues and came up empty. I wish I had an answer for you. Perhaps if you work with your printer on a new theme, a disclosure such as " This Design and Theme is owned by Tango Pizza or _________ Corporation. Any duplications of any part or segment must be authorized. It seems a tad tacky but to put so much work into something only to have it copied (and maybe confused as YOUR business) is sickening.
PD