Motorola MOTORAZR2 V9m Guia Del Usuario página 73

features
lock touch keys and external buttons
To prevent accidental presses of the touch keys and
external keys when you are not using your phone,
press and hold the smart key to lock or unlock them.
set external key lock
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features
lock application
Lock specific applications so that if you hand your
phone to someone, they can't see your messages,
pictures, music, or other personal files.
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> Settings > Security > Lock Application