Having obtained a certain level security clearance does not mean that one automatically has access to or is given access to information cleared for that clearance level in the absence of a demonstrated "need to know".[16] The "need-to-know" determination is made by a 'disclosure officer,' who may work in the office of origin of the information. The specified "need to know" must be germane to the prospective user's mission, or of necessity for the integrity of a specified security apparatus.