Having a charter.
Having membership of the relevant professional body and the necessary qualifications to carry on a particular profession.
Legitimate; legal; allowed by the rules; valid.
Not using cheats.
Cool by virtue of being genuine.
Genuine, actual, literal or honest.
Genuinely good and possessing all the required or expected qualities; the real deal.
Legitimately; within the law.
Honestly; truly; seriously.
A legitimate; a legitimate actor.
A legitimate child.