What the wider industry refers to as Secure Boot is, for a Mac user, better referred to as UEFI Secure Boot to differentiate from Apple Secure Boot used on Macs.
You see, while Intel Macs are technically UEFI devices, and UEFI Standards are set by an independent group that includes Apple and Microsoft, it was clear to Apple from the start, and accurately so as it transpired, that the big gorilla in the room, Microsoft, would become the de facto specifier of UEFI standards; being gatekeeper and actual determiner of the standards equipment makers must meet.
Today, you basically cannot, one way or another, implement UEFI Secure Boot on the equipment you make without Microsoft's blessing and Apple was never going to go along with this. Hence, Apple has always never fully compiled with UEFI specs ... at least not in an orthodox manner as this invariably meant Microsoft control.
Long story short, any user space app requiring UEFI Secure Boot, basically abusing this feature, excludes Apple Macs where this is not implemented and Apple's version is instead.
I wonder though, whether a third party Boot Manager like RefindPlus might be able to spoof UEFI Secure Boot being switched on.
