By special request, I have created a new feature to our images system. You can go to your Profile, then Site Preferences, and you have a new option under the watermark area:
"Let me specify some custom text for a watermark."
If you choose that, then it will pop in a small text field where you can enter your own text. Save your changes.
If you do this, then the watermark will be only exactly what you entered into that field.
You can change it later by editing it again, or revert back to the default options and let the system handle the text for you.
Remember: watermarking an image is permanent. Once a watermark is applied, it cannot be removed from the copy of the image stored at ATP.
Let me go play around with it. 
