Apple failed today, Monday, to convince a U.S. appeals court that the startup security company Corellium violated copyright by simulating its iOS operating system to help researchers find security vulnerabilities in Apple devices. The Eleventh Circuit Court of Appeals stated that "Corellium recreated Apple's system under the fair use principle in U.S. copyright law, which supported scientific progress by assisting important security research." Corellium's program in Florida allows users to run iOS on non-Apple devices, and to inspect and modify the operating system in ways that enable security researchers to discover vulnerabilities more effectively. Apple had filed a lawsuit against Corellium for copyright infringement in a federal court in South Florida in 2019.