I'm using Mojave and I'm trying to change the permissions for this file


I want to alter the duration that slides appear in my screensaver which I've figured out how to do but I cannot save my edits to the file. I continually get the error Operation not permitted. I have tried editing the file on the desktop that moving the file back but that does not work. That operation is denied. I cannot change permissions through getinfo and I cannot change permissions through the terminal command:

sudo chown myname /System/Library/

And also

sudo chown myname /System/Library/PrivateFrameworks/Slideshows.framework/Versions/A/Resources/Content/EffectDescriptions.plist

This article seems to deal with the problem but I really cannot tell what the guy is saying:



1 Answer 1


I had to turn off the system integrity protection available. The steps for doing that are here


After that I could change the permissions for plist file using getinfo and make the changes I wanted.

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