Both generated PDF and 8-acknowledgements.md (not for sure epub, but assuming it's generated from same Markdown file, then this also), states that:
Unless otherwise stated, this work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, see the LICENSE file in the repository, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
But the LICENSE file states this:
Attribution-NonCommercial-ShareAlike 4.0 International
Which brings me to the issue, that currently it seems You have dual licensed this creation under non-compatible licenses, which can cause issues when attributing and building something on top of it. My recommendation is to only use less restrictive CC-BY-SA 4.0 International license instead, since You already have published Your creation under that license and moving from less restrictive to more restrictive license can cause issues and clustering in community/project, like forking out the less restrictive version of the creation and building on top of it, essentially making two or more separate projects instead of contributing to the original one. It's also worth noting that CC NonCommercial license is not considered as truly open source.
Both generated PDF and
8-acknowledgements.md
(not for sure epub, but assuming it's generated from same Markdown file, then this also), states that:But the
LICENSE
file states this:Notice the NonCommercial part.
According to CC license compatibility CC BY-SA and BY-NC-SA are not compatible.
Which brings me to the issue, that currently it seems You have dual licensed this creation under non-compatible licenses, which can cause issues when attributing and building something on top of it. My recommendation is to only use less restrictive CC-BY-SA 4.0 International license instead, since You already have published Your creation under that license and moving from less restrictive to more restrictive license can cause issues and clustering in community/project, like forking out the less restrictive version of the creation and building on top of it, essentially making two or more separate projects instead of contributing to the original one. It's also worth noting that CC NonCommercial license is not considered as truly open source.