Yeah, that’s the other catch about not streaming video. People can generally save it. In my case, I didn’t care.
Though I have seen non-streaming video that had the save option disabled, or so I think. Apple’s movie trailers sometimes couldn’t be saved, and I think that was due to a QuickTime option. Clever people were able dig through their browser’s cache to find the video, though.
Back to streaming. If you can really get a handle on the format, this may be your only option. If you have QuickTime Pro, you can load up your movie file, then export it to a streaming format.