open to authorized persons just, as for reasons of nationwide safety: a classified document.
National safety information formally assigned by governing bodies to at least one of several quantities of susceptibility, typically (in English) top-secret, secret, confidential, and, in some countries, restricted; therefore making disclosure to unauthorized individuals illegal.
Any information an individual or company cannot desire to reveal.
arranged into courses or groups.
assigned to a class of documents withheld from basic blood supply; -- of information or papers. Opposite of unclassified.
organized into classes
authoritative classification of data or documents; withheld from basic blood supply