An important element of open access is that the end user can clearly see how and for what purposes they are permitted to reuse your work. Creative Commons Licenses are free, simple and standardised. They clearly explain what reuse permissions you as the author will allow or not allow for your work. There are 6 different licences that you can choose from. You will need to check if your funder (SHERPA/FACT) or publisher (SHERPA/RoMEO) stipulates a particular licence in order to make your work green or gold open access. Please note that the Library does not give advice on which licences, if any, to use. It is up to the author to decide how they would like their work to be reused. Please visit the Creative Commons site for more information https://creativecommons.org/about/cclicenses/.