Instead of completely uninstalling suspicious system bloatware (which can cause bootloops), the Pro Key allows you to "Freeze" apps. This completely deactivates the app and hides it from your system resource pool without deleting the underlying files. If your system becomes unstable, you simply "Defrost" it. System App Conversion
The is an add-on application that unlocks the full potential of the free version. Without the key, the app is limited to basic, manual backups. Why is Titanium Backup Pro Better? (Key Features) titanium backup pro key apk better