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You can set an actionscript to run on the first frame of the movie itself or use it in a preloader to restrict whether or not it loads the actual movie. However all someone must do is download the file and remove this bit of actionscript to be able to host the file on their domain.
You can also set up a apache rewrite rule to do this with the referrer string, but again it only prevents the "hot linking" not the downloading and hosting.