Nikon L30 - Manual (Page 106)

E 54
Re
fe
ren
ce
S
ect
io
n
Protect
The camera protects selected images from accidental deletion.
Select images to protect or cancel protection for previously protected images from the image
selection screen (
E55).
Note that formatting the camera’s internal memory or the memory card permanently deletes
protected files (
E71).
Press the c button (playback mode) M d button M Protect M k button