: The activation code is typically located on the back of the manual or the inlay of the CD case .
Firstly, it acted as a unique identifier. While activation codes could theoretically be shared or copied, tying a code to a specific email added a layer of identity verification. Secondly, and more practically, it served as a recovery mechanism. If a user lost their activation code or needed to reinstall the game on a new computer, the verified email was the primary method for retrieving the license key.
Successful verification is confirmed when a user links a valid product key to their email address, unlocking the full game.