The sounds included in "ui" dir are owned by Google Inc. and subject to their licenses.
The sounds included in "alarms" "notifications" "ringtones" are intellectual property of Francesco M. (Dil3mm4) as the composer and arranger except the following ones:
Access.ogg
Incoming.ogg
LonelynessIsBetterOfSometOtherThings.ogg
StreamingOverdrive.ogg
YouCantLieAtTheDeads.ogg
which are IP of Massimo Pinzaglia.
Therefore any un-authorized copy pasting of the said audio files listed in those directories, will be subject of legal actions.