Regarding the Secure Boot feature introduced in Windows 8:
Windows 10 to make the Secure Boot alt-OS lock out a reality | Ars Technica
First off am I understanding correctly that the Secure Boot option is actually enforced by UEFI and not by the OS? I'm seeing some concerns from people about being unable to upgrade to Windows 10 on older systems (BIOS) that don't support secure boot. That seems unlikely since Microsoft wants to push 10 to the whole Windows 7 base.
On the other hand it seems like folks who buy new systems with UEFI that doesn't include a Secure Boot switch are going to have problems with older or alternative operating systems...?