MicrosoftWindowsWindows 10
Windows stores the product key used to activate Windows inside its registry.
This includes licenses fromMicrosoft Action Packand MSDN subscriptions.
Also checkhow to extract Windows 10 product key from Registry.

Remove Windows 10 Product Key from Registry
slmgr /cpky
Thats it.
Now the product key cannot be seen using any software./cpky only partially removes the product key.
Only the last 4 characters of the product key can be retrieved.

kindly note that this command will not harm your rig or Windows licensing.
Windows will remain activated, and only the product key will be removed from the registry.
slmgr command starts Microsoft software licensing manager, and /cpky switch clears the product key from the registry.

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source: www.itechtics.com