which module for this purpose?

["Jen mlists" <suppressed>]

Hello members,

I would config/write a modperl module to do this thing.
When someone access a file which is located on special directory,say it was,
/download/test.flv
we would do some auth check.If his IP or request time were
reasonable,we could let him access this file.Otherwise we would return
a 403 error.

What's the correct module/way for protect this directory?
Thanks!