secure files with asp

Can anybody help me here?
I m having a asp page with some links to some pdf files..
this page is secured with a password and a username.
after logging in, it's possible to view the links and click on them to download the pdf files...
But if someone has the right url to the pdf files they can also download them...
Is there a way to secure these files so they can only be downloaded after the user is logged in? the usernames and passwords are stored in a simple access DB?

tnx

as what i know it can be done,the link page will not display if they are not log in,it will direct them to login page if user just enter url without log in.

I have answered your question in your duplicate thread.

you could use htaccess to limit access to the directory containing the files, but im not sure if this could be linked with an access database. this depends on you using apache and not IIS.