Download files outside DocumentRoot Dir

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Hi,
i'm trying to find a good solution to this problem. I want download files 
from a directory outside DocumentRoot.

This files cannot be downloaded through direct url like 
http://site/test.zip. It must be downloaded after user login.

I know i can do that using some functions like fread() + fopen() or 
readfile(), than i would echo file buffer to browser with correct headers. 
But, reading then dumping file to browser is a big problem to server.

I've made one test that shows me i will "eat" 1.8% of RAM (i've used "ps 
aux" at Linux, in a server with 2Gb of RAM) to download a 30Mb file at 
60kb/s speed. So, imagine what a dump-php-script can do with 50 to 100 
concurrently downloads. Probably i will need 1 TeraByte of RAM to provide 
downloads ;)

Theres my question now. Is there other way to protect files against direct 
downloading? (Obligating users to login and denying direct-url's).

I also know i can check referer by using Mod_Rewrite at Apache. But it isn't 
secure, since referer cannot be sent or be fake.

Please, help me ;)

Thank you !
--------
Script i used to test:
<?
$url = "test.tar.gz";

header('Content-Description: File Transfer');
header('Content-Type: application/force-download');
header("Content-Disposition: attachment; filename=\"".basename($url)."\";");
header('Content-Length: ' . filesize($url));
@readfile($url) OR die();
?> 

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