What this script does:

Queries the product key from UEFI.
Removes the current key (like an KMS key).
Installs the key found in UEFI.
Activates the key.
Presents the user with the licensing status.

Use case:
Removing a large set of KMS keys and replacing them with the OEM keys.

I have had an issue where KMS keys where used while deploying through MDT.
After transporting those systems to the customer, Windows activation issues began to occur.