Paragraph 102 DEFINITIONS OF TERMS IN THIS ANNEX
“Multilevel security” (5) means a class of system containing information with different sensitivities that simultaneously permits access by users with different security clearances and needs-to-know, but prevents users from obtaining access to information for which they lack authorization.
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N.B.: “Multilevel security” is computer security and not computer reliability which deals with equipment fault prevention or human error prevention in general.