Hello. I am about to self-publish a novel. The book will be sold through a publishing service that will sell physical copies of my book via print-on-demand, and also through PDF digital downloads. (I will receive a (small) percentage of the revenue.)
Here's the issue: I am designing my own cover and would like to use an image I found on Wikipedia, posted with the CC-BY-SA-2.0-AT license. I would like to use a part of this image on a part of my cover, and am trying to understand the extent to which I can use this image "commercially." I can certainly put an attribute to the author within the first few pages of the book (or on the back cover). I could also make a digital version of the cover freely available through my own website (and state that fact within the book). But obviously I can't give the entire book away for free (at least not physical copies).
So my question is: From a publishing perspective, what constitutes valid commercial use (if any) with the above license?
Thanks for any feedback on this matter.
