In a push to make their devices more secure for Enterprise use Samsung has built a feature into Knox for AT&T and Verizon devices that will brick your device if rooted. The new feature is called Root of Trust. Once the device has detected root your phone will shut down and will not power back on. You more than likely would not even be able to flash a stock image to restore the device.
The reasoning behind this is to make Samsung devices more Enterprise friendly. The question remains why is this feature only baked in to the Verizon and AT&T variants? Is this done at the carriers request?
This will more than likely be a huge deterrent for would be root devs. Where there is a will there is a way, but you should consider that the Note 4 took 6 months to finally find temp root, and permanent root is only available for the Note 4 on KitKat. If you are looking to buy a Note 5 from Verizon or AT&T buy it with the expectation that it will not be rooted.
via idigitaltimes