Why would a scientist or mathematician want to publish a paper under the Creative Commons CC BY licence? This licence allows the work to be modified. Why would you want to allow a scientific paper to be altered?
Yet Arxiv at https://arxiv.org/help/license seems to offer only licences that allow changes.
Similary Nature Communications at http://www.nature.com/ncomms/about/open-access:
“Nature Communications articles are published open access under a CC BY license”.
The CC licences that do not allow change are the ones with ND (no derive). So the natural choice would seem to be either BY-ND or BY-NC-ND. Can anyone shed light?