Board Thread:Young Justice News/@comment-1635895-20130520222934/@comment-4928331-20140109013730

Everything counts, but not in the same way. There are various levels of canon, all of which are valid. Except that if there's a conflict between higher-level and lower-level canon, the higher one wins:

Although I'm bummed about the butchery of Barriss Offee's character, her death in Order-66 was always C-canon, and so is malleable. I enjoyed Clone Wars, and look forward to seeing some familiar faces (maybe a battle-scarred Ahsoka!) pop back in Star Wars Rebels.
 * 1) G (George Lucas) canon: All the movies (the latest versions)
 * 2) T (TV) canon: Star Wars: The Clone Wars, and Star Wars: Clone Wars micro-series
 * 3) C (Continuity) canon: All the EU stuff (novels, comics, games)
 * 4) S (Secondary) canon: Stuff that existed before Lucas decided to strive to maintain continuity
 * 5) N (Non) canon: Includes deleted scenes and the Infinities mark (basically a Star Wars Elseworlds series)
 * 6) D (Detour) canon