You can select (
) Creative
Commons when you choose a license for the book (here)
or for images (here).
The symbols that appear correspond to your Yes
or No selections.
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These symbols are described here:
http://creativecommons.org/licenses/
http://creativecommons.org/licenses/by-nc/4.0/legalcode#s1i
appears if you select (
) Anyone can use it however
they want.
https://creativecommons.org/publicdomain/zero/1.0/ describes CC0.
The Book Metadata dialog box can display a URL to the selected book license.
Copyright and License dialog box - Images