Two January 2026 decisions from the US Court of Appeals for the Ninth Circuit confirm that copyright infringement requires substantial similarity in protectable expression, proven through both extrinsic and intrinsic tests. Yonay v. Paramount Pictures Corp. demonstrates strict application of filtration principles and the constraints of selection-and-arrangement theories at summary judgment. Sedlik v. Von Drachenberg, by contrast, underscores the central and increasingly contested role of the intrinsic test at trial, even when extrinsic similarity evidence is substantial. Yonay v. Paramount Pictures Corp., Case No. 24-2897 (9th Cir. Jan. 2, 2026) (Hurwitz, Miller, Sung, JJ.); Sedlik v. Von Drachenberg, et al., Case No. 24-3367 (9th Cir. Jan. 2, 2026) (Wardlaw, Mendoza Jr., Johnstone, JJ.) (per curiam) (Wardlaw, Johnstone, JJ., concurring).

The extrinsic test examines objective similarities in protectable expression after excluding unprotectable elements while the intrinsic test asks whether an ordinary reasonable observer would perceive substantial similarity in expression without expert guidance.

Yonay v. Paramount Pictures – “Top Guns”

Ehud Yonay authored and owns a copyright in “Top Guns,” a 1983 magazine article about the US Navy Fighter Weapons School, popularly known as “Top Gun.” Yonay sued Paramount Pictures, alleging that its 2022 film Top Gun: Maverick infringed that copyright. The district court granted summary judgment for Paramount, and Yonay appealed.

The Ninth Circuit applied the extrinsic test and rigorously filtered out unprotectable elements, including factual material about the Top Gun program, stock scenes, and high-level themes. The Court concluded that the similarities identified by the plaintiffs existed only at an abstract level and did not involve protectable expression. Although “Top Guns” contains vivid prose and an innovative narrative structure that qualify as protectable expression, none of that expression appeared in the film. The Court explained that even under a selection-and-arrangement theory, courts must filter out unprotectable elements and determine whether the works share a protectable “pattern, synthesis, or design.” After doing so, the Court concluded that the similarities identified by the plaintiffs consisted of unprotectable facts and ideas rather than original expression.

Because the intrinsic test is reserved exclusively for the trier of fact, only the extrinsic test was relevant at the summary judgment stage. The Ninth Circuit also determined that the district court did not abuse its discretion in excluding the plaintiffs’ expert, whose analysis failed to adequately filter out unprotectable elements and therefore relied heavily on similarities in facts and abstract ideas, rendering his opinions unhelpful.

The Ninth Circuit affirmed summary judgment for Paramount, holding that Top Gun: Maverick was not substantially similar to the article “Top Guns.”

Sedlik v. Von Drachenberg, et al. – Miles Davis photograph

Jeffrey Sedlik owns a copyright in his photograph of Miles Davis. Sedlik sued Katherine Von Drachenberg and her tattoo parlor, High Voltage Tattoo, alleging copyright infringement based on Von Drachenberg’s use of the photograph as a reference to create a tattoo depicting Davis’s likeness, the creation of a preliminary sketch, and the posting of related images on social media. After a jury trial, the district court entered judgment in favor [...]

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