PlayStation Jailbreak was the first Universal Serial Bus chipset that allows unauthorized code execution, such as homebrew, on the PlayStation 3. It bypasses a system security check using a memory exploit which occurs with USB devices that allows the execution of unsigned code. One of the most popular pieces of homebrew software used with the device is Backup Manager, which allows users to copy game titles from the optical media to the hard drive of the PlayStation 3. Backup Manager can also be used to run homebrew applications that are created to run in the console's native mode.