Declaratory Relief is a legal procedure designed for those seeking "preventive justice. " Specifically, its purpose is to "set controversies at rest.Bring an original action or cross-complaint in the superior court for a declaration of his or her rights and duties in the premises. A declaratory judgment is a court-issued judgment that defines and outlines the rights and obligations of each party in a contract. Declaratory Judgment Packet. A declaratory judgment establishes the rights and other legal actions of the parties without. A declaratory judgment is a judgment of a court in a civil case which declares the rights, duties, or obligations of one or more parties in a dispute. A plaintiff seeking a preliminary injunction must establish that he is (1) likely to succeed on the merits, (2) that he is likely to suffer irreparable harm.