Nikon D6 Reference Manual page 474

•
Protected pictures are marked with
a P icon.
•
To remove protection, display the
picture or highlight it in the
thumbnail list and press g ( h / Q )
again.
A
Voice Memos
Protecting photos also protects any voice memos recorded with the
pictures. Voice memos cannot be protected separately.
A
Removing Protection from All Images
To remove protection from all images in the folder or folders currently
selected for [Playback folder] in the playback menu, press the g ( h / Q )
and O ( Q ) buttons for about two seconds during playback.
422
Protecting Pictures from Deletion