Cite as: 505 U. S. 763 (1992)
Opinion of the Court
Marks which are merely descriptive of a product are not inherently distinctive. When used to describe a product, they do not inherently identify a particular source, and hence cannot be protected. However, descriptive marks may acquire the distinctiveness which will allow them to be protected under the Act. Section 2 of the Lanham Act provides that a descriptive mark that otherwise could not be registered under the Act may be registered if it "has become distinctive of the applicant's goods in commerce." §§ 2(e), (f), 15 U. S. C. §§ 1052(e), (f). See Park 'N Fly, supra, at 194, 196. This acquired distinctiveness is generally called "secondary meaning." See ibid.; Inwood Laboratories, supra, at 851, n. 11; Kellogg Co. v. National Biscuit Co., 305 U. S. 111, 118 (1938). The concept of secondary meaning has been applied to actions under § 43(a). See, e. g., University of Georgia Athletic Assn. v. Laite, 756 F. 2d 1535 (CA11 1985); Thompson Medical Co. v. Pfizer Inc., supra.
The general rule regarding distinctiveness is clear: An identifying mark is distinctive and capable of being protected if it either (1) is inherently distinctive or (2) has acquired distinctiveness through secondary meaning. Restatement (Third) of Unfair Competition § 13, pp. 37-38, and Comment a (Tent. Draft No. 2, Mar. 23, 1990). Cf. Park 'N Fly, supra, at 194. It is also clear that eligibility for protection under § 43(a) depends on nonfunctionality. See, e. g., Inwood Laboratories, supra, at 863 (White, J., concurring in result); see also, e. g., Brunswick Corp. v. Spinit Reel Co., 832 F. 2d 513, 517 (CA10 1987); First Brands Corp. v. Fred Meyers, Inc., 809 F. 2d 1378, 1381 (CA9 1987); Stormy Clime Ltd. v. Pro-Group, Inc., 809 F. 2d 971, 974 (CA2 1987); Ambrit, Inc. v. Kraft, Inc., 812 F. 2d 1531, 1535 (CA11 1986); American Greetings Corp. v. Dan-Dee Imports, Inc., 807 F. 2d 1136, 1141 (CA3 1986). It is, of course, also undisputed that liability under § 43(a) requires proof of the likelihood of confusion. See, e. g., Brunswick Corp., supra, at 516-517; AmBrit,
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