Definition of cautious. : careful about avoiding danger or risk cautious investors cautious optimism.
37 CFR 5.2 Secrecy order. ( 1 a) When notified by the chief officer of a defense agency that publication or disclosure of the invention by the granting of a patent would be detrimental to the national security, an order that the invention be kept secret will be issued by the Commissioner for Patents.
Created in 1952 by a secret executive order by President Truman, the National Security Agency (NSA) is the largest and most secretive of U.S. intelligence agencies -- so secretive that it is joked that its acronym stands for No Such Agency or Never Say Anything..