In rem

In rem jurisdiction (Latin, "power about or against 'the thing'") is a legal term describing the power a court may exercise over property (either real or personal) or a "status" against a person over whom the court does not have in personam jurisdiction. Jurisdiction in rem assumes the property or status is the primary object of the action, rather than personal liabilities not necessarily associated with the property (quasi in rem jurisdiction).

Within the U.S. federal court system, jurisdiction in rem typically refers to the power a federal court may exercise over large items of immoveable property, or real property, located within the court's jurisdiction. The most frequent circumstance in which this occurs in the Anglo-American legal system is when a suit is brought in admiralty law against a vessel to satisfy debts arising from the operation or use of that vessel.

Within the American state court systems, jurisdiction in rem may refer to the power the state court may exercise over real property or personal property or a person's marital status. State courts have the power to determine legal ownership of any real or personal property within the state's boundaries.

A right in rem or a judgment in rem binds the world as opposed to rights and judgments inter partes which only bind those involved in their creation.

Originally, the notion of in rem jurisdiction arose in situations in which property was identified but the owner was unknown. Courts fell into the practice of styling a case not as "John Doe, Unknown owner of (Property)", but as just "Ex Parte (property)" or perhaps the awkward "State v. (Property)", usually followed by a notice by publication seeking claimants to title to the property; see examples below. This last style is awkward because in law, only a person may be a party to a judicial proceeding – hence the more common in personam style – and a non-person would at least have to have a guardian appointed to represent its interests, or those of the unknown owner.

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Wikipedia