term:

Confidential

confidential adj

1 : known or conveyed only to a limited number of people [a disclosure]
2 : marked by or indicative of intimacy, mutual trust, or willingness to confide esp. between parties one of whom is in a position of superiority [the relationship of doctor and patient]
3 : containing information whose unauthorized disclosure could be prejudicial to the national interest
con·fi·den·ti·al·i·ty [kÄ n-fi-den-chē-a-lə-tē]
n

con·fi·den·tial·ly adv