Official Secrets Act of 2550
From Halopedia, the Halo wiki
The Official Secrets Act of 2550 prohibits any unauthorized dissemination or distribution of any contents of any messenger satchel. Failure to adhere to the mandated prohibition makes it an offence punishable with a summary execution by a UNSC authorized firing squad. After Tom Muir was taken aboard the ONI prowler Port Stanley, Captain Serin Osman exaggeratedly told Muir that even breathing on such a vessel was a breach of the Official Secrets Act.
In real life, Official Secrets Act is used as a common title for legislation involving the secrecy of information mainly related to national security in several countries.