This is an opinion from the United States Court of Appeals for the Federal Circuit concerning a patent infringement case between Fraunhofer-Gesellschaft and Sirius XM Radio Inc. The core issue revolves around equitable estoppel, a legal defense where a party is prevented from asserting a claim due to their misleading conduct and another party's detrimental reliance on that conduct. The court reversed the district court's summary judgment in favor of Sirius XM, finding that while Fraunhofer's five-year silence constituted misleading conduct, there was a dispute of material fact regarding Sirius XM's reliance on that silence when making business decisions about its satellite radio systems. The case will return to the district court for further proceedings to resolve this factual dispute.

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