LC4 — the No-Access lockout vector (4.7a). Setting every system-user role's rule on a field
to No Access one at a time writes no Deny anywhere, yet would end in a lockout — the guard
must refuse at least the LAST edit (judged by the projected aggregate, from the DATABASE,
because metadata lags the writes), and the system user must still read the field.
LC4 — the No-Access lockout vector (4.7a). Setting every system-user role's rule on a field to No Access one at a time writes no Deny anywhere, yet would end in a lockout — the guard must refuse at least the LAST edit (judged by the projected aggregate, from the DATABASE, because metadata lags the writes), and the system user must still read the field.