It's hard to be sure how to fix the copyright
position without seeing the movie file, but as
you are using the flv player to play an flv, why
not solve the rest of the problem using Flash
too? You could have the flv video playing as the
only thing in the flv_player.swf, and then put a
Flash text field over the lower part of the
stage, on top of the flv.
If this was added to the script in the flv_player.fla:
you would get a text field at the bottom left of
the video. It ought to be possible to pass the
copyright message as html via a Flash variable.
Now, obviously some of this requires a bit of
Flash knowledge, but then you deserve the pain
for using Flash and not QuickTime in the first
place!