Hello Kevin.
yes it is possible to do that you want. The thing you are trying to do is
called authorization by referrer. This will require not a client but server
side programming and is connected with windows media services authorization
plug-ins development. There is a ready made software to do what you want -
see http://voynex.com/wmsbilling for details.

Signature
Regards, Vladimir
http://voynex.com - custom software development, solutions for digital media
(pay per view, billing, protection, access control)
> Hi,
>
[quoted text clipped - 8 lines]
>
> -Kevin