A Visual or Spectral-Audio-Watermark is a good thing to have in your audio to prevent others from sampling your audio without your permission. Or the Spectral-Audio-Watermark can contain information such as the artist/producer name/ website and other data. It is like hidden data in your audio that can only be seen with the use of certain computer programs. The Visual-spectral audio watermark often looks like the above picture when not mixed in with too much other audio. Sometimes the watermark can be heard in the audio at certain frequencies.
I will Place a Visual/Spectral-Audio-Watermark of any word or short phrase of your choice into your audio. Then I will send you a spectral-graph image of what it looks like in the computer program.