Let's say that I'm using art works protected by the Creative Commons CC BY-SA 4.0 license. I then modify the art works so that they fit my personal requirements and include them in a commercial software which I sell to my customers. So far, this all seems to be in line with what the license mandates.
But the license also states the following:
ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
My mind comes up with two different ways to interpret that statement:
- If I decide that I want to share the modified art works I have to do so under the CC BY-SA license.
- The license forces me to share the modified art works.
Which of these two interpretations actually applies here?
If the first interpretation applies, would I be allowed to reject requests to hand over the modified art works?
If the first or second applies, would I be allowed to charge money for the work that I invested into creating the modified art works?