Nomen

der Registrierungsschlüssel

registration key, license key, product key, activation code

Bitte geben Sie den Registrierungsschlüssel ein.

Please enter the registration key.

Ich habe meinen Registrierungsschlüssel verloren.

I have lost my registration key.

((sth.)) to enter/have/need ((a registration key)) Bitte geben Sie den Registrierungsschlüssel ein.

der Lizenzschlüssel (license key), der Produktschlüssel (product key), der Aktivierungscode (activation code)

A compound word from 'Registrierung' (registration) and 'Schlüssel' (key).

Literally a 'registration key'. Think of the key you need to unlock a registered product.

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