Rightful

a.	1.	Righteous; upright; just; good; - said of persons.
	2.	Consonant to justice; just; as, a rightful cause.
	3.	Having the right or just claim according to established laws; being or holding by right; as, the rightful heir to a throne or an estate; a rightful king.
	4.	Belonging, held, or possessed by right, or by just claim; as, a rightful inheritance; rightful authority.

Adj.	1.	rightful - legally valid; "a rightful inheritance"
	2.	rightful - having a legally established claim; "the legitimate heir"; "the true and lawful king" Synonyms: lawful, true

according to Hoyle, actionable, applicable, appropriate, apt, authentic, authorized, balanced, becoming, befitting, bona fide, candid, card-carrying, competent, condign, constitutional, correct, de jure, decent, decorous, defensible, deserved, dinkum, due, equitable, even, evenhanded, fair, fair and square, fit, fitting, following the letter, genuine, good, honest, honest-to-God, impartial, inartificial, judicial, juridical, just, justiciable, justifiable, justified, kosher, lawful, lawmaking, legal, legislative, legit, legitimate, level, licit, lifelike, literal, meet, meet and right, merited, natural, naturalistic, nice, normal, normative, original, proper, pure, real, realistic, requisite, right, right and proper, righteous, sanctioned, seemly, simon-pure, simple, sincere, square, statutory, sterling, suitable, sure-enough, true, true to life, true to nature, true to reality, unadulterated, unaffected, unassumed, unassuming, uncolored, unconcocted, uncopied, uncounterfeited, undisguised, undisguising, undistorted, unexaggerated, unfabricated, unfanciful, unfeigned, unfeigning, unfictitious, unflattering, unimagined, unimitated, uninvented, unpretended, unpretending, unqualified, unromantic, unsimulated, unspecious, unsynthetic, unvarnished, valid, verbal, verbatim, veridical, verisimilar, warrantable, warranted, within the law, word-for-word