I've been having problems with Advanced DDblock (drupal 6)

- I've been getting an error message: crossdomain error. Videos will serve fine from youtube or vimeo, but we need to serve them from a secure university server as per the requirements of our project. I haven't been able to configure the DDBlock to accept the videos from the secure server.

I used a tutorial to create a crossdomain xml file, but I'm not sure where to put it -- or even if thats the answer. So far, no success.

Any insight would be very helpful.