CK-12, one of the biggest free textbook companies with names like Vinod Khosla and Jimmy Wales backing it, recently changed their licenses for their textbooks (or "Flexbooks") from CC-BY-SA to CC-BY-NC-SA.
http://about.ck12.org/terms It's funny because co-founder Neeru Khosla made this comment on the Creative Commons website last year: "The reason we chose to go with CC-BY-SA was because we wanted to make a statement about openness. We believe that the Creative Commons spirit is about openness. However, we are also thinking about donations from teachers and writers who have done a tremendous amount of work in producing or writing lesson plans or textbooks. When we approached these teachers or writers their concern was, how would they protect their work if a publisher takes their work with only attribution? They wanted to see the improvements made to their original contribution “back in the commons”. This is when we realized that we had to respect this genuine perspective and make them feel comfortable. Hence the choice of license! One thing we have continued to advise and educate our Author Donors is to stay out of the Non-Commercial clause. This is in the spirit that the non-commercial clause makes the content stale and obsolete over a period of time." http://creativecommons.org/weblog/entry/14141 So much for that. As far as I can tell, the change occurred recently, and they haven't blogged about it or explained the change. Thoughts? -Adi
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