You know those scary warnings that show up whenever you unlock the bootloader on a phone? “We can’t be held responsible… blah blah… reduced functionality… blah… fiery death… blah blah blah.” Sometimes they aren’t kidding. Users who have unlocked the new Xperia Z3 Compact have found that low-light camera performance drops considerably. It turns out to be because of DRM in Sony’s image signal processing.
When the bootloader is unlocked, the device loses certain DRM security keys.
Unlocking The Bootloader On Sony’s Xperia Z3 And Z3 Compact Causes Poor Low-Light Camera Performance Thanks To DRM [Update: Sony Updates Policy Text] was written by the awesome team at Android Police.