Microsoft Activation Scripts: https://massgrave.dev/

What Is MAS?

MAS (Microsoft Activation Scripts) is a fully open-source Windows and Office activation tool distributed as batch scripts. It implements multiple activation methods that operate against Microsoft's software licensing subsystem (SPP / OSPP / CLIP) to activate Windows and Office without a purchased product key.

https://deepwiki.com/massgravel/massgrave.dev/2-microsoft-activation-scripts-(mas)