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: Organizations and schools often provide licenses to their members for free or at a bulk discount.
. Threema is a paid, high-security messaging service that does not offer "extra quality" free license keys through third-party sites. Why You Should Avoid These "Free" Keys: Security Risks
Go directly to the official Threema website (threema.ch) or your native app store. Pay the small one-time fee. In return, you get peace of mind, "extra quality" security, and the knowledge that you are supporting ethical software developers who don't monetize your private life.
Threema has a fraud detection system. If you input a stolen or generated key, Threema will permanently blacklist your device's hardware ID. You will never be able to use Threema on that phone again, even if you later pay for it.