QUOTE(LOL50015 @ Nov 4 2017, 14:37)

Yeah but users who are not logged in can't see images and I think hotlinking the image from another site won't work.
So the only way a crawler gets to it is if it follows a direct link.
Correct. But that is just a question of removing the Referer: header. And any decent crawler will try an URL with and without Referer: to cross-check whether there are webserver rules about that. i.e. a crawler is not limited by webbrowser security rules.
P.S. The galleries method to avoid crawlers is much more elaborate (and better). i.e. there is a hash in the URL itself.
This post has been edited by blue penguin: Nov 4 2017, 17:04