: Most ZKTeco biometric terminals come with a license sticker or a card inside the box containing the activation code for the software.
Getting a free license key for (often referred to by version numbers like 3.3.1.3) typically refers to the initial 3-month trial period provided by ZKTeco. Beyond this trial, the software generally requires a paid license for continued use. ZKTime.Net 3.0 Licensing Overview
Please provide further clarification if needed.