Thanks a lot for your scripts. I'm a total newbie, but it only took 5 minutes for me to get them work.
As a sign of gratitude, I'd like to share with you and the community an experiment I just run.
I had noticed that, using Smart file download, once you download a file (a pdf, in my case) you can retrieve the url http://whatever.whatever.xxx/download.php?f=filename.pdf and that, typing this url in the address bar, you can download the file even without entering the site. (In my case, I link to that file from a password_protected page, that requires log-in. However, once you know the above path for the filename.pdf, I could download the file from anywhere).
So, what I did was to add the line:
<?php include("/whatever/whatever/password_protect.php"); ?>
that one uses to password protect a page at the top of the download.php file.
Now, if I try to type http://whatever.whatever.xxx/download.php?f=filename.pdf without having logged-in before, I am asked for my username and password.
For me, this is a way of password-protecting files which I find very convenient for my purposes.
As I said before, I'm a newbie, so do not trust me. It is working perfectly for now, but I do not why - which should induce other readers to be very cautious.
In any case, thanks a lot, and keep up the good work!