Audio Player with watermark

Hi

I’m in the process of setting up a marketplace for vendors to sell audio mp3. i’ve been looking for an audio player plugin that allows an audio watermark to be placed on the demo track so it is protected from piracy.

so –
Admin(me) will place an audio watermark from my admin panel. When the customer player the track the watermark overlays the vendors sample. This will save the vendors having to do it manually

I can’t seem to find such a plugin, does anyone know of a audio plugin that can do this?

I found one that can limit how much of a track is played, e.g 1min track can be played for 30sec. but this is not what i really wanted.

i’m really stumped on this one, all the watermarks seem to be manual.