• "The State v. Ram Bahadur" — the State (unique) prosecutes; "the plaintiff", "the defendant", "the licensee" — definite because defined by the document.
• Generic drafting: "A licensee must…" (any licensee) vs "The licensee must…" (the specific party to this licence).
• "He is a party to the agreement." / "She acted as an interpreter."
• Institutions: "the Supreme Court", "the High Court Patan", but "Parliament" and "court" in general uses often take zero or the by convention — check a style source and be consistent.