Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 358)

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By protecting the images, you can prevent the important images from
being accidentally erased.
1
Select the image to be protected.
Press the < 3 > button to play back
images, then turn the < 5 > dial to
select the image.
2
Protect the image.
When you press the < J / K > button,
the image will be protected and the
<
K > icon will appear at the top of
the screen.
To cancel the image protection, press
the <
J / K > button again. The < K >
icon will disappear.
To protect another image, repeat
steps 1 and 2.
J
Protecting Images
Protecting a Single Image with the < J / K > Button
Image protection icon