Like DRM, only sinister-er?

I’ve been having conversations today about a ‘non-DRM solution’ to filesharing. This conversation comes up pretty regularly, actually. I’ve now been approached by no less than three companies that would like me to examine, and perhaps endorse their own system.

Each time, it involves watermarking files. The idea is that it is completely invisible (and inaudible) to the listener, but tracks where t...