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…A licence of this kind may be either gratuitous or contained in a contract for valuable consideration: in either case at Common law it was revocable at the will of the licensor and was therefore no justification for any act…

…If, however, the licensee insists, notwithstanding the revocation of his licence (even though it is thus premature and wrongful), in entering or remaining on the land or in otherwise exercising his licence, he becomes at common…