If Lucas can copyright "Droid" why can't Apple copyright "app store"? I mean all tissues are called "Kleenex" informally but that doesn't mean Wal mart can sell equate brand "Kleenex" they sell tissue.... Post it notes and white out are the same thing.
But Apple didn't copywrite or trademark App Store (did they? I could be wrong). They trademarked, copywrited iTunes or iTunes Music Store. That's what it's been until this year. Everywhere I've been I would see iTunes icon to download something. Now it's Apple App store icon.
The term "Droid" is something Lucas came up with, before that it was Android or robot.
I use tissue, copy on a copy machine (actually at work it is an actual Xerox machine), use liquid paper, etc.
Oh here's a fun little article to read
They Own WHAT? Nine Tech Patent and Trademark Oddities -- including about the Droid name