On Mar 19, 2014, at 4:36 PM, Jens Alfke <[email protected]> wrote:

> On Mar 19, 2014, at 1:50 PM, Todd Heberlein <[email protected]> wrote:
> 
>> I presume they add their own signature to it.
> 
> That wouldn’t change the executable, though, just the signature(s) in the 
> _CodeSignature directory.

It does change the executable, as it adds an LC_CODE_SIGNATURE load command to 
the binary. You can verify this yourself with otool -l.

_CodeSignature is so that other files in the app's bundle which aren't in 
formats that can have code signatures embedded in them can be signed as well.

Charles

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