Nikon D330018-55VR User Manual (en)

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185
Playback and Deletion
A
Removing Protection
To remove protection from individual pictures so that they can be 
deleted, display pictures full-frame or highlight them in the thumbnail 
list and then press the 
A (L) button. To remove protection from all 
images in the folder or folders currently selected in the Playback 
folder
 menu (
0 220), press the A (L) and O buttons together for 
about two seconds during playback.