warranty (n.)
authorization, permission, sanction
Ham V.i.223 [Priest to Laertes, of Ophelia] Her obsequies have been as far enlarged / As we have warranty [Q2; F warrantis]
MV I.i.132 [Bassanio to Antonio] from your love I have a warranty / To unburden all my plots and purposes
Oth V.ii.60 [Desdemona to Othello] never loved Cassio / But with such general warranty of heaven / As I might love