My site lets ppl stream videos online. So I link them to an .asx file which redirects to the .wmv file. Now I don't want anyone to directly download my .wmv file. Is there any script I can install that can protect this file from being downloaded yet ppl can still stream it?

Monokill, unless you are streaming using Windows Media Server (WMS), my understanding that the WMV becomes much like a Quicktime MOV file -- it must be downloaded en masse to the browser. At that point, it ends up in the cache.

yes that's right. But if they find out the url of the wmv file, they can just use a download manager and download the wmv file.