Pentax Optio P70 Operating Manual page 152

3
Use the four-way controller (23)
to select [Protect].
4
Press the 4 button.
All the images and sound files are protected.
Protected images and sound files will be deleted when the SD Memory
Card is formatted (p.184).
4
To cancel the Protect setting on all your images and sound files, select
[Unprotect] in Step 3.
150
Protect all images/sounds Protect all images/sounds
Protect
Unprotect
Cancel
OK OK OK OK