Using FreeForm to protect downloads

freeform_downloads.html

// This is the form template, note the return including the form entry id
{exp:freeform:form
  form_name="downloadform"
  return="templategroup/downloadtemplate/%%entry_id%%"
}

  // fields go here..
  
{/exp:freeform:form}  

// This is the download template specified in return
{exp:freeform:entries
  entry_id="{segment_3}"
  dynamic="no"
}
  
  {if freeform:no_results}No downlaods for you!{/if} 
  
  // all the download links go here.
  
  
{/exp:freeform:entries}