Sources have revealed that a portion of iOS source code which recently surfaced online was leaked by a former Apple intern. Apparently, the employee stole additional source code from Apple as well.
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According to Apple, there's little reason to worry about the leak of its iBoot source code yesterday, because the software is a part of iOS 9, which is over two years old, and thus, outdated.
The iBoot software from Apple's iOS 9, has been released to the public. The release was leaked, presumably by someone at Apple, and has since been taken down from GitHub, but not before others got it.