I know that there are non-Lucas authors out there writing about what may have happened in between the episodes 1-6 and after 6. I've also read that Lucas tolerates or condones this but he is not the author of them.
What is authentically from Lucas and what is fan fiction? Is it correct that only the 6 movies (and their corresponding books) is the limit of what Lucas authored?
I'm trying to settle this for my own knowledge and to settle a friendly dispute with someone as well.
Thank you in advance.
-Aaron