And technically you can whitelist other certificates, too, but I have no idea how you might do that.
When you enter the UEFI somewhere there will be a Secure Boot section, there there is usually a way to either disable Secure Boot or to change it into “Setup Mode”. This “Setup Mode” allows enrolling new keys, I don’t know of any programs on Windows that can do it, but sbctl can do it and the systemd-boot bootloader both can enroll your own custom keys.
When you enter the UEFI somewhere there will be a Secure Boot section, there there is usually a way to either disable Secure Boot or to change it into “Setup Mode”. This “Setup Mode” allows enrolling new keys, I don’t know of any programs on Windows that can do it, but
sbctl
can do it and thesystemd-boot
bootloader both can enroll your own custom keys.