Starting with macOS 10.11 (El Capitan) Apple has introduced System Integrity Protection (SIP). The steps shows you how to configure your machine by partially disabling the new setting, so that you can use DRM Removal for Mac normally under iTunes 12.6.
Before you do this, it is important to get informed about what System Integrity Protection is, and what it means to turn it off. If you decide to partially disable SIP, you will be able to use DRM Removal for iTunes media conversion as before.
Note: Your machine may be less secure if you do. We strongly suggest you enable SIP again after finish the converting with DRM Removal for Mac.
1. You must boot into the Recovery OS. You do this by restarting your machine, and holding COMMAND + R until the Apple logo appears. Then select Terminal from the Utilities menu.
2. In the window that opens, type csrutil enable --without debug and press return.
3. This turns off the part of SIP that DRM Removal program needs to run. Now type reboot and press return to restart your machine. After restart, please install the latest version of DRM Removal for Mac on your computer. By doing so, you will be able to start conversion as before.
How to enable System Integrity Protection (SIP) again?
To secure your computer, we suggest you enable SIP again if you don't use DRM Removal any more. Please quite DRM Removal, then boot into the Recovery OS.
In the window that opens, type csrutil clear and press return. Now type reboot and press return to restart your machine.