Some of the CC licenses define ShareAlike term:
ShareAlike — If you remix, transform, or build upon the material, you
must distribute your contributions under the same license as the
original.
http://creativecommons.org/licenses/by-sa/3.0/deed.en
What does it mean to “build upon”? If image licensed under ShareAlike term becomes a part of some software, does it mean that software was built upon the image and it must become CC? Is it just a graphics on screen that is built upon image? Or is image considered a separate part on its own rights, with software being a medium mentioned by Share term:
Share — copy and redistribute the material in any medium or format
So that it can be used without affecting the software license.
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If you build something “from scratch,” this doesn’t apply.
But if you use “Application X” as your starting point, and tweak or “take off” on it, you are likely covered by the same license, even if your end product is rather different.
This is a fine point, to be covered by lawyers, but it could turn on something as simple as whether or not you downloaded Application X to your computer and worked off the copy, or whether you merely “saw” the image on Application X, were “inspired” by it, and developed something from scratch that had a few “coincidental” similarities.