I think it is absolutely ok if developers want to protect their software, but adding anything but the sound to the audio seems way too intrusive in my view. The protection should kick in at an earlier stage, i.e. regarding the download and installation of software, not the music I make with that software.
What kind of data do such watermarks include, who "reads" them and how?
I know there are plugins whose purpose it is to add musicians' own watermarks to songs in order to protect them, but that is a completely different story and not what this thread is about.
The more we learn of the NSA etc., the more allergic I become to tracking, spying, and all that secrecy and control crap...

