Security Risks Around License Keys Surprisingly, license keys can become attack vectors or markers of security issues. Key generators, cracked installers, and “free license” offers found on untrusted sites are common vectors for distributing malware. Users seeking a license key from dubious sources risk downloading trojans, keyloggers, or bundled PUPs (potentially unwanted programs) that defeat the purpose of using an anti-malware tool. Additionally, publicly posted keys may be pre-activated or already revoked, exposing users to stability problems and possible blacklisting.