You missed the point of the demonstration
"I copied it to my desktop without ever seeing a notice. Now one could always direct the prospective thief to ''Click image to see hidden copy protection''"
The point was NOT to see the notice, but to demonstrate what this particular type of invisible watermarking looks like. As a matter of fact, you *aren't* supposed to see the message.
Try this: open the picture you downloaded in a good graphics/photo editor, and replace the RGB 255,255,255 with 255,0,0. The pure white will turn red while the messages embedded in your downloaded picture will remain nearly pure white. *That* is the point of the demonstration. Unless you knew it was there, you (or a pirate) wouldn't never see it.
And, quite frankly, pirates aren't not going to go looking for it. Which means its likely to survive and therefore prove original ownership.
As you see, it is good advice and does deserve to be recognized.
As for my advice to Rita, I'd recommend she add an invisible watermark, do the DigiMarc stuff, put on a faint visible watermark, and *never* display high-resolution photos/graphics. Keep the publicly available images small enough so the quality of the print stinks.
Lastly, don't get carried away, Rita, if someone likes it enough to use as an avatar or other miniscule violation. Concentrate on larger fish to fry.