More information about modifying the licenses
Selected Frequently Asked Questions by Creative Commons. Licensed CC-BY 4.0
Can I change the license terms and conditions?
https://creativecommons.org/faq/#can-i-change-the-license-terms-or-conditions
Can I enter into separate or supplemental agreements with users of my work?
https://creativecommons.org/faq/#can-i-enter-into-separate-or-supplemental-agreements-with-users-of-my-work
Can I Modify the CC Licenses?
https://wiki.creativecommons.org/wiki/Modifying_the_CC_licenses
More information about marking licensed works
Marking/Creators/Marking Third Party Content by Creative Commons. Licensed CC-BY 4.0
Wiki with best practices and nuanced information on marking
https://wiki.creativecommons.org/wiki/Marking/Creators/Marking_third_party_content#Additional_explanation_and_tips
More information about license compatibility
Compatible Licenses by Creative Commons. Licensed CC-BY 4.0
A page with information on which licenses are compatible, how compatibility works,
and where there may not necessarily be compatibility between licenses
https://creativecommons.org/share-your-work/licensing-considerations/compatible-licenses
Wiki/CC License Compatibility by Creative Commons. Licensed CC-BY 4.0
More information on the CC license compatibility chart
https://wiki.creativecommons.org/wiki/Wiki/cc_license_compatibility
License Compatibility. Licensed CC-BY-SA 3.0
Wikipedia article on license compatibility including open licenses that are not CC licenses
https://en.wikipedia.org/wiki/License_compatibility
More scholarship about CC licenses
Creative Commons Licenses Legal Pitfalls: Incompatibilities and Solutions by Melanie Dulong de Rosnay at the Institute for Information Law at the University of Amsterdam & Creative Commons Netherland. Licensed CC-BY 3.0 NL
A detailed report on more nuanced and legal aspects of incompatibilities that applies in a variety of international applications
https://www.creativecommons.nl/downloads/101220cc_incompatibilityfinal.pdf
User Related Drawbacks of Open Content Licensing by Till Kreutzer in Open Content Licensing: From Theory to Practice, edited by Lucie Guibault and Christina Angelopoulos. Licensed CC-BY NC 3.0
Book chapter about some complicated issues that pertain to users of openly licensed materials (including CC licenses)
https://books.google.ca/books?id=RW1P5XOp_NoC&lpg=PA127&dq&pg=PP1#v=onepage&q&f=false
