QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 113)

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Click to check the files and view the proof result. If you select ‘Stop when watermark
error is detected’, the checking process will stop if a failed file is detected. Otherwise the
program will check all the files you have selected. If a file has been modified, the proof
result will be shown as ‘Failed’.