Post SBK??

I was just looking into my system files and came across this folder sys/firmware/fuse. In the folder it has some files that cannot be opened or viewed. one that caught my attention the most is this file by the name secure_boot_key. Now how can be extracted? is that the HTC SBK file? Has anyone ever looked at that file. did a google search and nothing much came on it. A thread for the LG Optimus 4X HD came up, which that phone i believe has the same SoC family as out HOX?
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