You need to research the type of trademark registration LA Derby Dolls has, then you will be in a position to decide the best course of action. Are they in the same type of business you're in? Is it a state or federal registration? If they only have a state registration, and you are in a different state, then you are probably ok. If they have a federal P.T.O. registration, that may cause concern if they have locked up "Derby Dolls" and are planning to enter the Florida market. Changing the spelling from Dolls to Dollz won't work. Consult with an intellectual property attorney in your area to get proper advice and facts.
Kevin B. Murphy, B.S., M.B.A., J.D. - Mr. Franchise
Franchise Attorney