To both onpon4 and lolider, No I did meant Secure Boot. In a Secure Boot
environment the user gets to decide what keys the computer treats as trusted
or not. Restricted Boot describes a different setup where they can't.
The FSF even draws this distinction: "When done correctly, 'Secure Boot' is
designed to protect against malware by preventing computers from loading
unauthorized binary programs when booting. In practice, this means that
computers implementing it won't boot unauthorized operating systems --
including initially authorized systems that have been modified without being
re-approved. This could be a feature deserving of the name, as long as the
user is able to authorize the programs she wants to use, so she can run free
software written and modified by herself or people she trusts."
In that they're describing Secure Boot, not Restricted Boot.
So we can use both terms (Secure Boot and Restricted Boot) depending on the
specifics of the situation. And in this case I was talking of Secure Boot.