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special compartmented information stresses
data.prot.	информация особой важности (США)
sec.sys.	информация особой важности; информация высшей категории секретности
English thesaurus
Special Compartmented Information
abbr., intell.	SCI (especially sensitive classified information, ‘the dissemination of which is strictly controlled and limited to selected individuals within the military and intelligence community who have special security clearances.")