License – this term details a given legal and voluntary permission to perform an activity or to carry out an act that would otherwise be considered unlawful. A very usual example is when allowing a somebody to pass through your own property which, if it were not for the license, would constitute trespass. Licenses are revocable at will (unless supported by a contract) and, as such, differs from an easement (the latter conveying a legal interest in the land). Licenses which are not based on a contract and which are fully revocable are called “simple” or “bare” licenses.