A license is not a tenancy and therefore (save for one exception) the Residential Tenancies Act 2004 does not apply to such an arrangement. A license can be best described as a permission to enter onto and/or occupy a dwelling (without which a trespass would occur). The period of occupancy is far shorter for a license than for a tenancy. Examples of a license are a person staying in hotel, hostel or guesthouse or a person sharing a house with the owner.