I just discovered "blackra1n" on my MacBook Pro. It was created in 2009, before I bought the system, which seems to indicate it was installed by Apple as a legit program. Wikipedia says it is a program that jailbreaks version 3.1.2 of Apple's operating system for iDevices, known as iOS. I have no idea what that means. Is blackra1n necessary for MacBook Pro operation integrity? In fact, is it even a safe program?