I have an Xperia SP (12.A.1.201, LOCKED bootloader). I want to root my device but rooting requires unlocked bootloader I need to preserve the DRM keys.
According to [Tutorial] Xperia SP Bootloader Unlocking/Relocking (http://forum.xda-developers.com/show....php?t=2354721), I need to ROOT my device first to backup the DRM keys but then as per [RECOVERY] CWM-Based Recovery 220.127.116.11 + ROOT for Xperia SP  (http://forum.xda-developers.com/show...php?p=50272112), I need to UNLOCK bootloader first.
Quite confusing. What needs to be done? I need help.
I cannot lose my DRM keys.