The "CertKey" aspect refers to the tool’s ability to apply OEM certificates. This is often used by enthusiasts to match the BIOS SLIC table of a motherboard to the OS, ensuring the "Genuine Windows" status on refurbished hardware.

How to Use Windows 7 OEM Brander v1.9: The Ultimate Branding AIO Tool

Windows 7 OEM Brander (often found as a "hot" ZIP package containing the AIO tool) is a specialized utility designed to edit the information in the Windows registry.