They are either malware, scams, or temporary evaluation keys in disguise. Using them violates laws, voids support contracts, and poses a severe security risk to your network. The only safe, reliable way to license Cisco equipment is through official channels—whether purchased outright, subscribed via Smart Licensing, or using legal evaluation copies for testing.
– Any software claiming to “generate” Cisco licenses is either: Cisco License Generator
The newest generation (IOS-XE 17.3+) uses even stronger cryptographic attestation. The device and Cisco’s servers exchange certificates. There are no "license codes" to type. They are either malware, scams, or temporary evaluation