Estoppel in bills, bailment and licences prevents parties from denying the authority underpinning those legal relationships.

Section 117 creates an estoppel preventing an acceptor of a bill of exchange from disputing the drawer's authority to draw or endorse the bill. A bailee or licensee cannot deny the bailor's or licensor's authority at the commencement of the bailment or licence. An acceptor may challenge the purported drawer's genuineness, while a bailee may prove another person's superior right to delivered goods.

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