Welcome. As long as you state that your maps are only for personal use then you should be fine. People from around the world will see them and probably put them in a folder so that they can use them for their own games but there are a few who will try to claim that they made them so always put your name or logo on anything. Even then some will just crop out your name if it is close to an edge. Some folks will work very hard to erase your name rather than make something on their own...nature of the beast.