The answer is Operation of Law. This is a legal term that points out that a right or liability has been formed for a party, irrespective of the intention of that party, because it is ordered by existing legal principles. For example, if an individual dies without a will, his or her heirs are resoluted by operation of law. Similarly, Adverse possession, in which title to land go by because non-owners have engaged it for a definite period of time, is another significant right that vests by operation of law.