Lockdown as a security module

So you are in favor of confusing at least 99.5% of all people in the world about what this feature does? The only people who will understand what is written as you do will be people who have followed this discussion (mostly security geeks and Linux kernel programmers). The alternative wording will be understood by everyone who understand your preferred wording or at least will clue in people who aren't monitoring this discussion that this feature might not do what they want.

And if we are going to be pedantic about it, I would point out that it is likely that >99.5% of the legal "owners" of the systems in question will not in fact be "keyholders"; so your wording is false using the more widely understood legal meaning.