Personal property
Interest in personal property may be either absolute or qualified. The latter case is illustrated by animals "ferae naturae", in which property is only coextensive with detention. Personal property may be acquired by occupancy (including the "accessio", "commixtio", and "confusio" of Roman law), by invention, as patent and copyright, or by transfer, either by the act of the law (as in bankruptcy, judgment and intestacy), or by the act of the party (as in gift, contract and will).