In camera (Latin: "in chamber") is a legal term meaning "in secret".
It applies to court cases (or portions thereof) to which the public are not admitted. Certain cases may be ordered to be heard in in camera when matters to do with national security are concerned. Otherwise, justice in free countries operates under the principle that in order for justice to be done, justice needs to be seen to be done, and the admission of the public to the court is considered a right.
In Camera is also one of the proposed translations of the title of Jean-Paul Sartre's play Huis Clos, a French legal term with the same meaning.
