- In Copyright (2175)
- Creative Commons BY Attribution 4.0 International (1756)
- Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International (564)
- Creative Commons BY-NC Attribution-NonCommercial 4.0 International (227)
- cc-by-3.0 (46)
- http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (22)
- cc-by-nc-3.0 (20)
- https://creativecommons.org/licenses/by-nc/3.0/legalcode (13)
- https://creativecommons.org/licenses/by-nc/3.0/ (10)
- https://creativecommons.org/licenses/by/3.0/ (10)