rounakr94 :
rgd1101 :
https://technet.microsoft.com/en-us/library/ff793435.aspx
So Because of Volume License it shows up as unknown, plus it shows up as BBBBB-BBBBB-BBBBB-BBBBB-BBBBB in serial key finders
Those sets of keys indicate your were running a volume license client copy of WIndows. The volume License copies of Windows 10 are only licensed to larger companies doing large deployments of WIndows.
Okay...if your question is how do I know Windows is genuine....that key shows its a valid corporate copy . And by pressing win key and x /system.........it should have "Windows is Activated" Maybe this is above me as im not sure what your asking if this doesnt provide an answer