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Revisit - Retrieve Microsoft Windows Product Key From UEFI Shell

In a February 2015 post, I published the source code for a simple UEFI shell utility which could retrieve a Microsoft Windows product license key from a system running Windows 8 or later. The code was based on the GNU EFI development and runtime libraries. There are a number of freely available EFI development environments. GNU EFI is probably the simplest of these and is what I recommend for beginners. It’s easy to install in a Linux environment such as Fedora 23 as both runtime and development RPMs are available from the Fedora repos. The most sophisticated EFI development environment