geigertube writes: "I'm currently working on crowd sourcing what I believe to be the worlds first Creative Commons world-building art book. (I'm a professional illustrator working for Marvel.) It's currently NC licensed, as I could use the money if a major production house/studio/whatever wanted to do something with it. Individuals or small companies I'd give commercial licensing to for free. I was contacted by a gentleman who wanted me to make the license properly Free Culture, saying that there would be a larger audience for the book, along with a number of good arguments for switching to Free Culture. But, the way that rights are utilized and monetized currently makes retaining the NC aspect into a possible extra revenue stream, whereas I have no proof of any significant gains in sales from going Free Culture. I'm basically wondering if there is actually an audience out there that would buy this book because it became Free Culture, that wouldn't by it otherwise. If I can see some hard evidence of this audience, I'll likely switch to an Attribution-ShareAlike 3.0 Unported license."