This article is worth reading. An interesting thought piece (two actually) on the move away from the open web to closed systems running across the internet that control the devices we use, the delivery mechanisms and the content we consume (read Apple).
Christina Hendricks ponders the CC-BY conundrum - how open are we comfortable with? Citing the example of Apple making bucks from others CC-BY work and adjusting the text she explores the dilemmas of adding NC, ND & SA to the deed.