Copyright is established when an idea is expressed materially for the first time by a maker. ie if you take an image the copyright is yours. I don't worry about putting makes on my images. If someone wants to steal it and call it theirs they are only fooling themselves. I don't take the images to make money, I take them to get satisfaction of doing the task.
If you post stuff on the web you are asking some person out there in cyberland to lift your image eventually. Many countries do not follow copyright related ideas. China being one. So if you don't want someone to lift your image and use it for themselves, DON'T POST ON THE INTERNET. It will be 100% safe right from the start then. Putting marks on images is just going to invite cropping or use of the heal tool or many other functions to remove your mark.
You can if you like put something in the data file to signify it is yours. You can always prove something is yours anyway, you should always keep all your subs or originals out of the camera. That is proof positive that something is yours. Good luck.
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