- In Copyright (1942)
- Creative Commons BY Attribution 4.0 International (1256)
- Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International (443)
- Creative Commons BY-NC Attribution-NonCommercial 4.0 International (180)
- cc-by-3.0 (27)
- http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (21)
- cc-by-nc-3.0 (14)
- https://creativecommons.org/licenses/by-nc/3.0/legalcode (10)
- https://creativecommons.org/licenses/by/3.0/ (9)
- https://creativecommons.org/licenses/by-nc/3.0/ (8)