[Q] DRM Keys Question, Bootloader Unlock, Urgent!!

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http://forum.xda-developers.com – I would post in the Flash tools thread but XDA wont let me. I was reading the Xperia Z threads and I saw people talking about loosing their DRM Keys forever if they unlocked the bootloader. So, If I unlock the ZL boot loader using the flashtool method will the DRM keys disappear forever? What will those DRM keys affect? I need to know, before I buy it and I need a replacement phone now. I've only dealt with phones that have unlocked boot loaders. (HowTos)