"This is an emergency communiqué. It is not to be discussed with fellow officers unless deemed absolutely necessary. There will be no computer record of said transmission."
– Code 47 transmission preamble, 2364 ("Conspiracy")

In Starfleet signal protocol, a Code 47 was an encrypted communication intended for receipt only by officers holding the rank of captain or higher. Voiceprint authorization by such an officer was required to open the channel, and no computer records of the transmission were maintained.

In 2364, Captain Walker Keel of the USS Horatio used a Code 47 to contact Jean-Luc Picard of the USS Enterprise-D in order to request his presence at Dytallix B. (TNG: "Conspiracy")

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