Year, thank you for your answer. I see root is possible for our device, but I hesitate to do it as I don't know exactly which apps would stop working once and for all without drm keys and there are no good custom roms, even cyanogenmod. I wonder, this device was released ten months ago, and so little done.
It make me feel blue, as it kills the hope that something would change in the nearest feature((((((
If you need my help in testing new ways of root, some new roms, feel free to send a word to me, I would try to help as much as I can))))