Starting with version 0.6 the Professional version of ProofBuddy has the option to watermark your files during upload. While watermarks are not a 100% method to keep your images from being copied, they do serve as a deterrent.
You have two options for watermarks, three if you count turning them off. First is a graphic watermark. An uploaded PNG or JPG image is placed over the uploaded image. The second option is a text watermark where you enter the text you want to use as your watermark. Either option gives you the ability to set the opacity and position of the watermark. There are 9 options for positioning the watermark - top left, top center, top right, middle left, middle center, middle right, bottom left, bottom center, and bottom right.
The image below is an example of an image processed by ProofBuddy using a graphic watermark set at 25% opacity and positioned at the middle center. The image also has an image label.

