title: Rails public/system for user files
body: <p>Both Rails gems <strong>DragonFly</strong> and <strong>Paperclip</strong> use public/system folder to store uploaded files.</p>
  
  <p>As far as I know this folder is accessible by everybody - at least the root files, 404.html or others.</p>
  
  <p>How can I protect these uploaded files? Is there any configuration options available?</p>
  
  <p>I need to process transcoded video files which are generated from user uploads and make them available with some permission checks.</p>
  
  <p>Are there any recommendations?</p>