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communicate these keys because they subscribe to the exact same standard. Petra, they use an air interface encryption, so AIE, which is basically, that protects the RF hop between the radio and the terminal and the base station, right? So once the signal hits the infrastructure, it's routed into the clear, unless you have something, the E2EE layer, which is the end-to-end encryption layer. Unless that's configured differently, that's typically the way Tetra works. Let me drop it. And Tetra, it relies on the TEA1 and the TEA4 family for encryption. And TEA2, that's actually restricted to European Emergency and Intelligence Services, and TEA3 is for public safety.