Hi,
Yes, I am well aware that there are several other ways to retrieve the image. But as I said, I just need this particular solution. I don't need the solution to be fool proof. I just need to make it a little difficult.
If I may explain, the person to whom I am sharing the images do not know any of these ways. He just knows how to right-click save picture, and that only if he remembered how. Even that he was taught by me. I haven't taught him print-screen, view source or installed Photoshop. But if he by chance figured how, good luck.
Rashkae, peacewithinPG, I tried Flickr. Not available. Maybe paid account, as you said. I also tried Shutterfly. Looks promising. No "Save Picture As" but there is a "Download this picture" option, so I need to investigate further. Seems like a Shutterfly account is required, which is good enough an obstacle.