How do I root Sony Xperia Z3 on Android 5.1.1 without unlocking Bootloader

I updated my XPeria Z3 (D6603) to the latest android 5.1.1 (Version 23.4.A.0.546) and now i am unable to root my device. Is there a way of getting root access without unlocking the bootloader? I do not want to lose my DRM keys.