for advanced users !
Watch out ! this might don't work, depends on your apache config!

this plugin creates .htaccess files in your './galleries/' directory to disallow hotlink' to your pics, BUT not for your thumbnails (so rss feed still works !!) :
- 1 at the root of this directory. (looks like)

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^$_SERVER['HTTP_HOST']/.*$ [NC]
RewriteRule .*.*$ http://yoursite.com/piwigo/plugins/hotb … bloked.gif [NC]

- and 1 in each thumbnail directory.

RewriteEngine on
RewriteRule ^.*$ -

You can only activate (so files are created, replaced if already exists) or deactivate (so files are deleted, even if made by your own, not by the plugin)