[otterley]

> That is completely not true. There is no way to make such a thing that can only work on one particular phone

The technique that makes this possible is described in Apple's iOS Security White paper, page 6 ("System Software Authorization"): https://www.apple.com/business/docs/iOS_Security_Guide.pdf

This mechanism explains why you can't take an old release of iOS off a different phone and copy it to yours.

[st3v3r]

You've missed the point: By doing this, they've shown that it's possible, and that they already have the tools. Meaning that next time, it's going to be almost impossible to say no.