Kevin Smith has published "Defining Derivatives" in Scholarly Communications @ Duke in which he discusses the Drauglis V. Kappa Map Group decision. In this case, a photographer sued a publisher who used his CC BY-SA licensed photo on Flickr without permission.
Here's an excerpt:
One thing that is clear, and this is my second point, is that a Share Alike provision does not require that the second work be made available for free, as long as a derivative is not created. The compilation atlas containing Drauglis' photo was sold, of course, and the court said that was OK because there was no non-commercial restriction on the license and the commercial work was not a derivative (which would activate the share alike restriction).
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