# Scenario -
# Installed linux over windows without noting the key
# Want to re-install windows (to sell computer )
# Can retrieve the windows key thus -

sudo hexdump -s 56 -e '"MSDM key: " /29 "%s\n"' /sys/firmware/acpi/tables/MSDM

# Output - > MSDM key: .....-.....-.....-.....-.....