Or if you mean Flash in general...
You could try Sothink SWF Catcher, you can download (almost) all flash from a site, and it reverse engineers the .swf to a .fla
You have to know Flash to figure out where the .swf downloads the video from the main site
If you know, you can (almost always) download the vid from the main site...
How do I find the actual url onhow to do it though? doing it thru firefox I can't figure it out. Seems like so much trouble to do it all for just a few chapters of a DVD.