I'd imagine that most if not all usage of station campaigns and news themes from US networks on Australian TV would've been licenced and above board though, since the graphical elements in Nine's original "Still The One" promo are basically the same as ABC's but with a different logo. Similar deal with Seven's versions of the NBC Idents & Launch Campaigns during the 1980s, etc.
In my personal opinion, the Cool Hand Luke-derived news theme currently used on Nine News here in Australia doesn't really work with their rather flashy graphics or sets. I also have my doubts that Americans would really enjoy listening to the versions of The Mission which Seven News introduced only a few years ago.