Sony VPL-CX70 Operating Instructions Manual page 12

Security Functions
Security lock
This function makes it possible to project no
picture on the screen unless the required
password is entered when the projector is
turned on.
Panel key lock
This function locks all the operation keys on
the control panel of the projector, allowing
use of the keys on the Remote Commander.
This prevents the projector from operating
incorrectly.
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Features
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