Can All But One IP Address be Blocked?

I have a website where customers will be paying for purchases
with a credit card via PayPal. After they complete their payment at
PayPal, they are returned to a specific page on my website. On this
page are Word files available for download. Is there a way to keep
anyone from viewing this page except users who have returned to the
site from PayPal? I am trying to prevent unauthorized downloads of
the Word files by non-paying customers. Even hiding part of the
code on the page unless the user comes from PayPal would work. I am
assuming this can be done with an Application.cfc file, but perhaps
I'm wrong. If I'm right, I haven't been able to figure out how.
Thanks in advance for your help.
Gwen H
CF Noob

> <cfif cgi.http_referer contains "paypal">
> display this content
> <cfelse>
> display an error message
> </cfelse>
>
Not all that secure as http_referer and any other header i.e
cgi content
is rather easily spoofed. I.E. it would not be hard for me to
use my
Firefox plugins to add 'paypal' to the referer and I'm in
like Flint.
What type of paypal account do you have?
When we had a membership section of our site, I had the type
where
paypal posted a response to my site from there. The action
page on my
site that received the post processed the results and took
appropiate
action. If the transaction is correct and proper the user
record in our
database was updated allowing that user access to the member
content.

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