Nikon d3s User Manual (en)

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I
A
Voice Memos
Changes to the protect status of images also apply to any voice memos 
that may have been recorded with the images. Voice memo overwrite 
status can not be set separately.
A
Removing Protection from All Images
To remove protection from all images in the folder or folders currently 
selected in the Playback folder menu, press the 
L and O buttons 
together for about two seconds.