QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 124)

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Click to check the files and view the proof result. When ‘Stop when watermark error
is detected’ is selected, the checking process will stop if a failed file is detected. Otherwise
the program will check all the files selected. If a video file has been modified, or is not
exported with digital watermark, or not an NVR video file, the proof result will be shown as
‘Failed’.