It won't exactly be a copyright, you should get a trademark, they(U.S. Patent and Trademark Office) do a search....there are guidlines for a trademark, like just the name and also the logo...and how it will be used....you submit it and they do a search to see if there is a trademark already registered.....there are two different fees associated....one is like $300 and the other is $600...I did one about a year ago it might be different now.....the one thing is if they find a name that is already registered the money is not refundable I don't think because the fee is for them to do the search and register it....go do a search on google for trademarks and patents...you can find the U.S. Patent and Trademark )Office site it will give you the lowdown on all of that.....but sorry to hear that someone called you because if they did get it trademarked, then you would legally have to stop using it or face a lawsuit....