Gary it is a tricky one my friend. Theft of images is rife these days and I totally agree that you should protect your work. To be honest I have no idea how you are going to tackle this one. I really enjoy your images and for me personally its a shame to see the added mark. I know others do not have a problem with it and its a personal thing. The mark will not deter me from looking though mate. Like you say..maybe placement elsewhere in the image of the mark would be better. Ultimately of course it is totally your choice as to what you do. I think people were just casting an honest opinion and not asking you to remove it.