A security bypass module was an electronic device that was used for bypassing a security net and allowing access to restricted areas.
In 2369, Neela was tampering with the net near pad c on aboard the space station Deep Space 9. One of the station's sensors detected an anomalous reading in the net, so Aquino investigated the reading. He interrupted Neela, who murdered him with a phaser shot. She later moved the module to pad A, where she hoped to steal a runabout after the assassination of Vedek Bareil Antos. (DS9: "In the Hands of the Prophets")