Yes, you use stamps to protect your images from getting copied online and at the same time provides you with a sense of security. There are many tools/apps that can do that for you but I personally prefer doing with a free Android app called Auto Add Logo Copyright with Text on Camera Photos. You can easily add a logo, copyright stamps & trademark stickers along with text on photos captured with your built-in camera! That way you don't have to worry about adding stamps one by one to your photos. All you need is a one-time setup, that's it! Download and Start Marking your memories. I find this application extremely useful in day to day life. Hope this solves your query.