I did some research and could not answer the question:
Does CC BY-NC ensure that the NC restriction is passed forward?
I would think it should. Otherwise, someone could make a tiny change to the work and release under whatever license they please. Or it this intentonally allowed by the license?
What got me wondering is the following. Derivative work can be released as:
- All rights reserved
- CC BY-NC-ND
- CC BY-NC-SA
- CC BY-NC
- Something else
The first three would solve the issue, number 4 is self-referring. I would expect the last possibility to be somewhat regulated by the CC BY-NC license, but I could not see it.
PS: I personally don't like NC licenses, but I am starting an Open Educational Resource project and would like to have at least a small understanding of each widely-used license in case people ask.