I’m not sure exactly how it works. I haven’t used it in a while now. It has several different options to activate, including hardware id or setting up a local KMS server. I only ever had to use it one time, per windows install, and it would keep windows activated. It also has a tool to switch windows versions, i.e. home to pro. It is fully open source and their wiki goes into more detail. https://massgrave.dev/