Brooks said:

Sorry, don't mean to go off topic, but this is a question that's been bothering me for a while. It's always been apparent that Lucas owns the rights to Empire and Jedi having funded them himself rather than going through the studios, but doesn't Fox have a say in Star Wars itself? Does Lucasfilm have exclusive control of it as well?

Zombie did an informative article on the issue here: http://secrethistoryofstarwars.com/buyingstarwars.html

Lucasfilm (madman) didn't acquire the full rights to the first film until sometime after '97.