Normally, the entry of an unappealed final judgment ends the case forever, even if later developments undermine faith in the accuracy of the decision or the fairness of its procedural grounds. Litigation must have an end, and a final judgment usually marks that point.
Rule 60(b), however, has long been available to provide relief from judgment to losing litigants where justice so demands. The rule states that a court may relieve a party from final judgment "[o]n motion and just terms" under five enumerated grounds (including mistake, newly discovered evidence, fraud, voidness, and judgment satisfaction) and one catchall provision. The catchall, Rule 60(b)(6), provides that a court can relieve a party from judgment for "any other reason that justifies relief."