Use your Registration Key to register your product on the Trend Micro Online Registration Web site. Register your products to ensure you are eligible to receive the latest security updates and other product and maintenance services. After registration is complete, Trend Micro issues an Activation Code you use to activate Trend Micro software and other Trend Micro services.
See also:
Understanding Activation Codes
Understanding product activation
Activate Control Manager
Convert to the full version
Renew product or service maintenance