Although the US Court of Appeals for the Federal Circuit upheld a damages award for trade secret misappropriation and breach of a confidentiality agreement, it found that the district court erred in its determination of when the trade secret became publicly accessible for the purpose of applying a reverse engineering defense. The Federal Circuit also vacated and remanded the prejudgment interest award, finding that interest should not accrue on future sales. ams-OSRAM USA Inc. v. Renesas Elect. America, Inc., Case No. 22-2185 (Fed. Cir. Apr. 4, 2025) (Taranto, Schall, Chen, JJ.)

In 2008 ams sued Renesas for patent infringement, trade secret misappropriation, and breach of contract for using information that ams revealed in confidence. In 2015 a jury found for ams, and the district court entered judgment for trade secret misappropriation damages, but not for breach of contract. The district court determined that the breach award was duplicative of the misappropriation award. On appeal, in 2018 the Federal Circuit affirmed Renesas’ liability for misappropriation on a more limited basis than had been presented to the jury. The Court vacated the misappropriation award and remanded, instructing that disgorgement of profits damages should be decided by the judge, not the jury.

On remand, ams argued that it was entitled to “re-elect its remedy” and narrowed to the misappropriation and contract claims, which required the case to be retried. The new jury also found in favor of ams. The district judge then determined the monetary award for trade secret misappropriation, consisting of disgorgement of profits for one product and exemplary damages of double that sum. On ams’s breach of contract claim, the jury awarded a reasonable royalty on sales of products, other than the one subject to disgorgement damages. ams was also awarded prejudgment interest on both its misappropriation and contract claims, and attorneys’ fees on its breach of contract claim. Both parties appealed.

Trade Secret Accessibility and Reverse Engineering

The district court ruled that ams’s trade secrets became accessible in January 2006 when Renesas successfully reverse engineered the trade secret embodied in ams’s product. The district court determined that the relevant inquiry for accessibility is what the misappropriator actually did rather than what the misappropriator or other parties could have done. Renesas argued that the trade secret first became accessible when it could have reverse engineered the trade secret in February 2005.

The Federal Circuit agreed with Renesas, explaining that the district court’s ruling was inconsistent with Texas law. Under Texas law, information that is generally known or readily available by independent investigation does not qualify as a trade secret. Citing Fifth Circuit precedent, the Federal Circuit emphasized that the public is free to discover and exploit trade secrets through reverse engineering of products in the public domain. The Court found that Renesas could have accessed ams’s trade secrets through proper and straightforward means by February 2005. While acknowledging that the trade secret may not have been immediately apparent through casual inspection, the Court pointed out that reverse engineering is a common [...]

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