Voice Override: Epsilon Actual was a spoken order that took precedence over a droid's original instructions. This override was triggered by a spoken passcode, often a single word or a short group of words. Captain Jeremoch Colton installed this command in C-3PO on the Tantive IV so that the droid would not reveal the presence of Princess Leia Organa. This was done after she had obtained the schematics for the first Death Star from Rebel operatives on Toprawa.