Very true. What I described was the original meaning of watermark as on quality paper stock. Also, it was not for security. If you want a deterrent for people using your images, you would have to make another layer with your watermark on it. It would be the top layer over your image. You can make it as obvious as you want (changing the opacity). It is just a deterrent to thief of your images as it would take some editing of your image before being able to use it as their own. There are Java Scripts that will disable right clicks on a web page and other security for images being taken. As for digital watermarks, if you have real concerns about copywrite of your images, you would need the search engine that searches out your digital watermark or you would have a rather big job on your hands searching web and reading each image for your watermark (or rely on the honor system). Sorry, i'm not a fan of digital watermarks.