LT Security LTD2508SE - Manual (Page 70)

DVR User Manual
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Fig 7-9 file management interface
Lock: select certain file item in the file list box and then click “Lock” button to lock this file that ca not be deleted or overlaid
Unlock: select a locked file and then click “unlock” button to unlock this file
Delete: select an unlock file and then click “delete” button to delete this file from file list