AVer NXU8000 - Manual (Page 82)

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4.6.1 Watermark Verification
Now, DVR supports watermark-checking to identify the authenticity of playback video. DVR program
can only verify one channel at a time in playback mode.
To verify
the playback video doesn’t been modified. Click
to check the video. Watermark
verification window will show up as following:
i
Watermark verification doesn’t support the video that is recorded from MPEG IP camera.