mod_rewrite issue

Hi everyone,

Perhaps some of you have also noticed that RealPlayer version 11 adds
a "Download this video" button to allows end users to download any
media that is displayed in a given website. Let's skip the discussion
of whether or not this was a jerk thing for RealPlayer to do and focus
on stopping it :)

I have created a .htaccess file in attempts of blocking the RealPlayer
from downloading videos/music from my website.

The .htaccess file looks like this:

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^RealDownload [OR]
RewriteCond %{HTTP_USER_AGENT} ^RMA
RewriteRule ^(.*) - [F,L]

Now, when I click on the button, I see the following logged in the
access log:
255.255.255.0 - - [13/Apr/2009:18:55:28 -0500] "GET testFile.mp3 HTTP/
1.1" 403 505 "-" "RMA/1.0 (compatible; RealMedia)"

Great! They got a 403! Exactly what I wanted! However, the file is
still downloading straight to my computer!?

Anybody know how this is possible? I don't see any other hits in the
logs requesting this file immediately after the 403. How is the rule
being ignored?

Thank you in advance for any assistance!

--
odmoney