Comment Why not ask who are in charge of defining words? (Score 1) 173
If you were going to ask a "someone" how they meant to define "derived work", you would ask Congress, not the author(s) of one out of a million contracts which happen to make use of that term.
You're right that it's upsetting that (mostly) people who don't really work with copyright would end up answering it, but that's the nature of law, or at least until you start electing[/appointing/etc] authors. (Cynic: or until those people start funding election campaigns.)
It's only after you have determined that something is a derived work, that you go study licenses. Until that point, licenses are irrelevant.