The Deep Core Security Zone was a restricted area of Imperial space in the Deep Core that included the planet Byss within the Beshqek system. Despite the Imperial Center being the seat of Emperor Palpatine's power, evidence seems to point to the Security Zone having always been an easily defended fallback position for the Galactic Empire.
- (Mentioned only)
- Dark Empire (First appearance)
- The Official Star Wars Fact File 7 (PLA6, Planets of the Core Worlds)
- Scum and Villainy
- The Complete Star Wars Encyclopedia
- The Essential Atlas
- Star Wars: Edge of the Empire Core Rulebook