746
Opinion of the Court
ested party seeking such declaration, whether or not further relief is or could be sought." 28 U. S. C. § 2201. See also Fed. Rule Civ. Proc. 57. Thus, in Aetna Life Ins., we held that an insurance company could bring a declaratory judgment action to determine the validity of insurance policies. The company and the insured disputed whether the policies had lapsed and how much was currently payable, but the insured had not brought suit to recover benefits. 300 U. S., at 239-240. We observed that the controversy would admit "of specific relief through a decree of a conclusive character, as distinguished from an opinion advising what the law would be upon a hypothetical state of facts." Id., at 241. See also Wallace, supra, at 262. We have thus recognized the potential for declaratory judgment suits to fall outside the constitutional definition of a "case" in Article III: a claim " 'brought before the court(s) for determination by such regular proceedings as are established by law or custom for the protection or enforcement of rights, or the prevention, redress, or punishment of wrongs.' " Fairchild v. Hughes, 258 U. S. 126, 129 (1922).
The underlying "controversy" between petitioners and respondent is whether respondent is entitled to federal habeas relief setting aside his sentence or conviction obtained in the California courts. But no such final or conclusive determination was sought in this action. Instead, respondent carved out of that claim only the question whether, when he sought habeas relief, California would be governed by Chapter 153 or by Chapter 154 in defending the action. Had he brought a habeas action itself, he undoubtedly would have obtained such a determination, but he seeks to have that question determined in anticipation of seeking habeas so that he will be better able to know, for example, the time limits that govern the habeas action.
We think previous decisions of this Court bar the use of the Declaratory Judgment Act for this purpose. In Coffman v. Breeze Corps., 323 U. S. 316 (1945), a patent owner brought suit seeking to have the Royalty Adjustment Act
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