True, 3rd party not trusted by default is a "Secured-Core PC" requirement, but so is the BIOS option for enabling that trust [0]. On my "Secured-Core" ARM ThinkPad T14s it's a simple toggle option.
> Even recently, a Windows updated added a number of Linux distributions to the Secure Boot blacklist, resulting in working dual boot systems being suddenly cripped. Of course, _ancient_ MS OSes are never going to be blacklisted.
Actually they are in the process of blacklisting their currently used 2011 Windows certificate, i.e. the Microsoft cert installed on every pre-~2024 machine, also invalidating all Windows boot media not explicitly created with the new cert. It's a manually initiated process for now, with an automatic rollout coming later [1].
It'll be very interesting to watch how well that's going to work on such a massive scale. :)
[0] https://learn.microsoft.com/en-us/windows-hardware/design/de...
[1] https://support.microsoft.com/en-us/topic/kb5025885-how-to-m...