I’m not a big fan of the public domain. I think it works just about OK for text, but it’s bad for images and worse for music and moving images. A decade ago I could photograph paintings in state-funded galleries in London, but now I would have to pay for reproductions that come with restrictive licenses attached. It’s good to see serious thought about the limitations and future possibilities of the public domain.
Duke University (home of Parapsychology) have a Center For The Study Of The Public Domain.