I have followed a couple of tutorials for adding rules in ISAPI to stop image hotlinking for a website I own.
I have added this
RewriteCond Referer: (?!http://(?:www\.mydomain\.co\.uk)).+
RewriteRule .*\.(?:gif|jpg|png) /images/block.gif [I,O]
BUT all the images are changed on the actual site to block.gif? No matter what I try it just replaces all the images and not just changing the image for people hotlinking? Any ideas what is wrong with my syntax?