The Certificate of Authenticity is not a license to use the Microsoft software. The COA is a security device that accompanies a legally licensed Microsoft software. It includes the product key for your version of Windows which is hidden under a scratchable silver surface.
The COA assists you to determine whether the Microsoft software and components, such as media and manuals, are genuine. If your Microsoft operating system software (Windows 8, Windows 10 and other versions) were supplied to you preinstalled on a new computer system by an original equipment manufacturer (OEM), look for the Certificate of Authenticity on the exterior side panel of the computer case.
CyberPowerPC, the Original Equipment Manufacturer (OEM), is required to affix the Certificate of Authenticity in this manner. For other Microsoft software, your COA is included with the software components and you should keep them in a safe place.
The COA contains anti-counterfeiting devices, such as the holographic strip, to help prevent the production of counterfeit Microsoft software.