how to hide links from other websites?

[hamedbia2]

Hell,
how can i hide links from other websites?for example,in vbulletin.org just licensed mebers can download,and no other one can download it,
Another example;If i have a 1Gb file in my host and users of my site can download it,but if the other site try to take the link of this file in his site,his users can download it also,how can i prevent his users to download it?

Best Regards:
Hamed

[BirdOPrey5]

You could look at how to block file leaching with your htaccess file.

Lots of info on google, one such site explains it well here:
http://blamcast.net/articles/block-hotlinks

[hamedbia2]

Thanks a lot Birdoprey5 :x