“restricted” folder/files in OS X El Capitan

Question

After upgrading from OS X Yosemite to OS X El Capitan Developer Preview, I tried to edit /System/Library/LaunchDaemons/ssh.plist to change the default SSH

Answer 1

You can also leave SIP enabled while disabling the filesystem management. Reboot in recovery mode and run:

csrutil enable --without fs

This will allow you to change permissions as needed.