Security classification (Government documents) Government information 10 Official secrets 10 Freedom of information 5 Access control 4 Executive privilege (Government information) 4 National security 4 more ... History 3 Leaks (Disclosure of information) 3 Defense information, Classified 2 Democracy 2 Freedom of the press 2 Government accountability 2 Internal security 2 Law and legislation 2 Secrecy 2 Acces control 1 Amphibians as laboratory animals 1 Animals, Mythical 1 Archives 1 Assassination 1 Cold War 1 Data protection 1 Discovery and exploration 1 Electronic intelligence 1 Electronic surveillance 1 Espionage 1 Ex-convicts 1 Experiments 1 Fairy tales 1 less ...