Asus MeMO Pad HD 7 - Manual (Page 85)

K00B 
Tap to hide selected contents
Tap to show selected contents Tap to delete selected contents
Tap to select all contents
Tap to add files that you want
to lock
Protected files pane
Using File Protection
To use File Protection:
1. Tap
to open File Manager app.
2. Tap to select the files that you want to protect, then tap . The files
that you want to protect appear on the File Protection screen.
File Protection screen