Enable/Disable Secure Boot. On non-ARM systems, it
is required to implement the ability to disable Secure Boot via
firmware setup. A physically present user must be allowed to disable
Secure Boot via firmware setup without possession of PKpriv.
Programmatic disabling of Secure Boot either during Boot Services or
after exiting EFI Boot Services MUST NOT be possible. Disabling Secure
MUST NOT be possible on ARM systems."
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