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Friday, April 24, 2026

False Advertising: Verifiably False Versus Subjective Opinion - Lexology

In a case originally based on a false advertising claim under § 43(a) of the Lanham Act, the US Court of Appeals for the Ninth Circuit affirmed in part, reversed in part and remanded the district court’s dismissal of the claim. The Ninth Circuit concluded that the defendant’s description of a competitor’s software product was plausibly alleged as an element of false advertising. Enigma Software Group USA, LLC v. Malwarebytes, Inc., Case No. 21-16466 (9th Cir. June 2, 2023) (Clifton, Bumatay, Baker, JJ.) (Baker, J., concurring) (Bumatay, J., dissenting).

Enigma is a security software company whose products detect and remove malicious software such as viruses, spyware, adware and ransomware. Malwarebytes is a direct competitor of Enigma and sells products aimed at detecting and removing malware and other potentially threatening programs on users’ computers. Enigma originally brought this action in the US District Court for the Southern District of New York, but the case was moved to the Northern District of California on a motion to transfer filed by Malwarebytes. The California court ruled that Enigma’s claims were barred by § 230 of the Communications Decency Act, a ruling that the Ninth Circuit reversed, holding that § 230 did not apply to “blocking and filtering decisions that [we]re driven by anticompetitive animus.” The Ninth Circuit remanded the case.

On remand, Enigma asserted four causes of action:

  1. False advertising in violation of the Lanham Act
  2. Violation of New...


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