Why I did not license the above image with a Creative Commons License:
On one hand,"Creators may also apply Creative Commons licenses to material they create that are adapted from public domain works, or to remixed material, databases, or collections that include work in the public domain...
...in each of these instances, the license does not affect parts of the work that are unrestricted by copyright or similar rights.
We strongly encourage you to mark the public domain material, so that others know they are also free to use this material without legal restriction."
from https://creativecommons.org/faq/#may-i-apply-a-creative-commons-license-to-a-work-in-the-public-domain accessed 8/8/2018
On the other hand, there are copyrighted pictures in the image. “It may not be possible to release works under one of the CC licenses if you do not control all of the necessary rights” from: https://wiki.creativecommons.org/wiki/CC_Factsheet#When_CC_tools_are_not_appropriate accessed 8/8/2018 with regards to (c) 2018 by Katharine Schwab quoting Mario Klingemann; @quasimondo tweet; (c) 2017 by Autodesk.
The main reason I chose not to add a Creative Common License is that I am thinking of the re-user.
While not required, Creative Commons urges creators to make sure there are no other rights that may prevent reuse of the work as intended. CC licensors do not make any warranties about reuse of the work. That means that unless the licensor is offering a separate warranty, it is incumbent on (the responsibility of) the reuser to determine whether other rights may impact their intended reuse of the work. Learning more can sometimes be as easy as contacting the licensor to inquire about these possible other rights. Read through this complete list of considerations for reusers of CC-licensed works.
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