Possession may be lawful, it may be unlawful. It may be legal or illegal. The acquisition of legal possession would obviously be lawful and would of necessity involve the occurrence of some event recognized by law whereby the subject matter falls under the control of the possessor. But a problem arises where the duration for which possession is recognized is limited by the grantor or the law. Continuance of possession beyond the period specified by the grantor or recognized by law is not treated as a lawful possession. For example, a tenant acquires legal as well as lawful possession of the tenanted premises from the landlord with the express consent of the landlord but limited to the duration of the lease. On expiry of the leaser, if the landlord does not consent to the lease being continued, the possession of such tenant would not be a lawful possession. The nature of possession being not lawful would entitle the landlord to regain possession.
From a common sense point of view, lawful possession must be the state of being a possessor in the eyes of law. The possession must be warranted or authorized by law; having the qualifications prescribed by law and not contrary to nor forbidden by law. Sawwad Ali v. Rajesh Kumar, 2019 (135) ALR 927.