Originally Posted by R_a_z_v_a_n
KNOX bootloader verifies signatures of kernels and recoveries. No custom ones possible without voiding the knox warranty
Not sure if a custom recovery with trigger KNOX.
I have a BML1 with KNOX and I have rooted the stock with Kingo, flashed Philz touch recovery with Odin and my KNOX warranty is still 0x0.
I haven't changed the kernel though. Maybe only the kernel change triggers KNOX.