I ran a packet trace and then made a request to the protect.htm page. I looked over my http traffic and manually sent a request for each of the http requests that the browser had automatically made. I noticed there was an example.php. When I got that, it looked like the same page. I was able to use the Media tab of the Page Info dialog to save the image. Of course, none of this was possible on the protect.htm page.
It could just be coincidence. Maybe I got unrelated code that happens to look like the protected page itself. That's why I'm not exactly sure I did it. Admittedly, I got lost in all of the http requests and 308's.