CC BY  (Creative Commons Attribution License)

Allows others to copy and redistribute the material in any medium or format and remix, transform and build upon the material for any purpose, even commercially. This is often the preferred choice for journal articles, particularly in science, technology and medicine, as it allows other researchers to make full use of the findings in their own work. It is also the licence that is required for journal articles by some funders, including cOAlition S.

CC BY-SA  (Creative Commons Attribution Share-alike License)

Allows others to copy and redistribute the material in any medium or format and remix, transform and build upon the material for any purpose, even commercially, provided it is distributed under the same licence as the original original. This licence is permitted by some funders as an alternative to CC BY.

CC BY-ND  (Creative Commons No-Derivatives License)

Allows others to copy and redistribute the material in any medium or format. However, if you remix, transform or build upon the material these modifications cannot be distributed. This licence is permitted by some funders as an alternative to CC BY.

CC BY-NC  (Creative Commons Non-Commercial License)

Allows others to copy and redistribute the material in any medium or format. However, the material may not be used for commercial purposes. It can be an appropriate license for monographs because it protects print copy sales while still providing scope for users to create derivative works of the online version to the benefit of all academia.

CC BY-NC-SA  (Creative Commons Non-Commercial Share-alike)

Allows others to copy and redistribute the material in any medium or format, remix, transform and build upon the material for any non-commercial purpose, but the material may not be used for any commercial purpose. If the material is remixed, transformed or built upon, it must be distributed under the same licence as the original. While the Share-alike licence might sometimes encourage further uptake of OA by authors wanting to re-use the content, it can also create an unnecessary barrier to the re-use of the OA content.