A software license key is essentially a digital decoder ring. When you purchase Comodo Internet Security Pro, you receive a unique sequence of letters and numbers via email. Entering this key into the software initiates a handshake between your local machine and Comodo’s secure activation servers.
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While a firewall is in the free version, the Pro version is often touted for its "enterprise-class" filtering and hardened defense against tampering. Auto-Containment A software license key is essentially a digital decoder ring