title: Download files directly with apache for authenticated users
body: <p>Here is the deal , 
  I'm selling some files and they can be downloaded.</p>
  
  <p>So , only the users that have paid for the files can download them.
  I want to avoid download via PHP script for many reasons
  - The files are large ( some are ~5GB)
  - If the download crush , it must start over again.</p>
  
  <p>Is there any way ? Any strategy at all that can help me identify the users that are allowed to download the files , and let apache do the job ( to provide a direct link for download ) instead of using PHP script to stream the file.</p>
  
  <p>Any Ideas ?</p>