Emergency Order 7-6-2 Alpha was Starfleet protocol that was executed if Starfleet was ever compromised.
In 2401, Captain Liam Shaw executed Emergency Order 7-6-2 Alpha after imposter Starfleet officers destroyed Commander Ro Laren's shuttlecraft. (PIC: "imposters")
During the emergency transmission issued by Federation President Anton Chekov, "Protocol: 762-Alpha" can be seen. (PIC: "The Last Generation") It is unknown if there is a relation between the Emergency order and the Protocol"