I assume you mean "Threema" (secure messaging app) and want a full review of its licensing, key features, extra-quality (audio/video?), free/updating—I'll cover app overview, license/key model, security/privacy, features (quality), updates/pricing, pros/cons, and verdict.
A Threema license key is a unique code that unlocks premium features and provides access to exclusive content. By entering a valid license key, users can enjoy additional functionality, such as custom themes, advanced security settings, and enhanced file sharing capabilities. threema license key extra quality free upd
If you have already purchased a key and lost it, you can use the Retrieve License Keys I assume you mean "Threema" (secure messaging app)