Nginx movie hotlink protection

[Supaflyz]

Anyone know how to protect flv movies from being hotlinked when using nginx?

[fris]

location ~* ^.+\.(gif|jpg|mpg|mp3|mpeg|avi|flv)$ {
       valid_referers none blocked domain.com [url]www.domain.com;[/url]
       if ($invalid_referer) {
          return   403;
       }
    }