Do you realize I am talking to have root on KitKat 4.4.2 with a locked bootloader and let me know if DRM contents (BE2, MusicID) work on Kitkat 4.4.2 with an unlocked bootloader?you can do this http://forum.xda-developers.com/xperia-z/development/guide-how-to-root-101-firmware-lb-t2656698
and you will have a locked boot loader with root