If I want to use images licensed under the creative commons cc-by-sa license, how do I have to share the derivative work in order to comply with the license of the original image?
In particular, how is sharealike compatible with commercial use?
If I use cc-by-sa images in a design that I want to print on a shirt and sell, it seems like that should be acceptable because the license does not prohibit commercial use -- However, how would I have to share the work? Is my design considered the only derivative work in this case, or would I have to consider that in printing a shirt, a new work is created which also must be licensed under the same license? If so, does this mean that the shirt cannot be sold?