joschi is right: nginx is driven by a single configuration file you can't edit. Your only possibility is to use a redirector script which says '403 Access Denied' for hotlinks and '301 Moved Permanently' for normal links.
One solution is to generate all your pages & content dynamically, and with different URLs every time, which expire after a while. That makes hotlinking impossible.
If that is not practical, you can also check referrer. If you cannot reconfigure nginx, you'll probably have to do it in a scripting language which generates the pages dynamically.
Without access to the server configuration, you cannot change any settings. There is no equivalent to Apache httpd's .htaccess in nginx.
Just in case you HAVE access to the webserver:
joschi is right: nginx is driven by a single configuration file you can't edit. Your only possibility is to use a redirector script which says '403 Access Denied' for hotlinks and '301 Moved Permanently' for normal links.
One solution is to generate all your pages & content dynamically, and with different URLs every time, which expire after a while. That makes hotlinking impossible.
If that is not practical, you can also check referrer. If you cannot reconfigure nginx, you'll probably have to do it in a scripting language which generates the pages dynamically.