rightfully hold a private key "rightfully hold a private key" means to be able to utilise a private key- (a) which the holder or the holder's agents have not disclosed to any person in contravention of this Act; and (b) which the holder has not obtained through theft, deceit, eavesdropping or other unlawful means; ACT 562 - DIGITAL SIGNATURE ACT 1997 2. Interpretation.