is it possible to take backup & restore of Xperia Z3+ DRM Keys?

Hi, Is it possible to take backup & restore of DRM Keys of Xperia Z3+? After bootloader unlocking, is there is any chance of getting back the warranty? After Unlocking bootloader of Z3+, can I get the official updates? (restoring stock ROM without rooting)

Can anybody help me answer me about these?

Thanks in advance.

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