All realty is immobile tangible. A tangible thing can either be a realty or be a personalty. Personalty is the property owned by individual persons. Property is the right to use, possess, enjoy and dispose of a thing.
Intellectual property is intangible property.
Property right is the right of the owner to use, possess, enjoy and dispose of this property according to the civil law. A lien is a claim laid on property to secure the payment of a debt. A gift is different from a purchase, because when one makes a gift he generally does not get something in return. The owner who has lost or milaid property is always entitled to possession over any finder. A customer finds a bag on the counter of a bookstore.