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Look for the "Register" or "Enter License Key" option, usually found in the menu bar under the app name or in the settings window. Enter the Key:
At its surface, Radio Silence is a minimalist firewall for macOS. Its primary function is simple: it allows users to block specific apps from accessing the internet. While many use it for privacy—stopping a word processor from sending telemetry data, for instance—the search for a "license key" reveals a more complex narrative about the of the internet. The Paradox of Security Radio Silence License Key