Since I haven't entered into a formal agreement with them, I wanted to make sure that they couldn't copy the image by direct linking to it, when I sent them to the page on the web to view the image or copy the image through the right click menu.
Thanks in advance.
The watermark also is another place to put your company logo so it leaves an impression in there mind of your logo while they are looking over your graphic with a fine tooth comb. They won't know why but the only name they will think of with graphics is yours.
Good luck