RewriteEngine On 

## PREVENT HOTLINKING ###
SetEnvIfNoCase Cookie SESSION=(.*) IS_OK
SetEnvIfNoCase Referer "^http://(www\.)?example\.com(/.*)?$" IS_OK
SetEnvIfNoCase Referer "^http://(www\.)?example\.net(/.*)?$" IS_OK

<FilesMatch "\.(avi|bmp|flv|gif|jpe?g|mov|mp(3|4|e?g)|png|swf|tiff?|wm(a|v))$">
  Order deny,allow
  deny from all
  allow from env=IS_OK
  
  ErrorDocument 403 http://127.0.0.1/
</FilesMatch>