I have a business and am being told by another business from another state that I need to stop using my name because they have a federal trademark that no one can use their name in any business name. For example (names are being changed for privacy): Smith Photography is the supposedly trademarked business. My business is Susie M. Smith Photography. Smith Photography is claiming I cannot use "Smith Photography" within my name by protection of trademark. Do I need to change my name or is it distinguishable enough to be within my right to use? Note: I have searched the US Patten and Trademark Office database and they are not listed at all. I have also requested they send me documentation of trademark of Smith Photography.