[ddingus]

My advice here would be to do some analysis on known watermarked audio, and or go patent, software, firmware hacking.

The first step is to ID marks successfully.

Only then can means and methods to evade the mark be trusted.

I would look really hard at what the radio industry has done. They faced very significant challenges as internet advertising rose up to dominate.

The incentives to get this right and be super robust are all there and are time tested, production proven today.