Linux: View your Windows license number from embedded firmware
April 1, 2014
UEFI/Bios Embedded License Key
Ubuntu:
sudo hd /sys/firmware/acpi/tables/MSDM
Fedora:
sudo cat /sys/firmware/acpi/tables/MSDM
Or
sudo apt-get install acpidump
sudo acpidump > myhiddenkey.txt
You will find the key under MSDM