I'm an illustrator and I've created an original work for commercial publication/sale that incorporates part of a photograph I sourced from Wikicommons. The photo in question has a “Creative Commons Attribution-Share Alike 4.0 International” license.
(For context: The image is a photograph of a starry night sky, which I’ve composited into my original illustration as a background texture.)
Does the ShareAlike license mean that my new, original work would have to give up its copyrighted status to agree with the CC license of the incorporated image? And that my original work cannot now be copyright because of the rights mismatch?
I'm a bit confused by the terms of ShareAlike: do I understand correctly that it requires subsequent creators/remixers to license those derived/remixed works with a ShareAlike license?
I’m very happy to co-credit the photographer, but if using part of the image means I’d forfeit the copyright of my work, then I’d rather remove/replace the element.