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Re:Use zsh as the default shell on your Mac by michaelmrose on Monday June 03, 2019 @09:07PM (#20090768)
I don't think the prior poster is suggesting that you would have to sign existing software.

I believe that they are suggesting that Apple would be required to let you sign your own software if you do choose and give owners the right to opt to have their os trust software they OR Apple signed.

There is something that was addressed in the gpl community called tivoization.

Tivos dvrs were Linux boxes wherein they shared their source technically complying with the letter of the gpl but in fact locking them down so users couldn't modify the devices violating to many peoples mind the spirit and clearly expressed intent of the license.

This is if I understand correctly dealt with in gpl 3 which is what I think the poster is talking about.

Apple ios devices are non free in the same fashion as Tivos which is incompatible with gpl3

Re:Use zsh as the default shell on your Mac by musicale on Monday June 03, 2019 @09:22PM (#20090849)
This only seems to be an issue for iOS and its derivatives. You can replace /bin/bash on macOS if you turn SIP off.