Consider using a Creative Commons (CC) license for your journal (https://creativecommons.org/use-remix/cc-licenses/). The CC website will help you determine the best license. A CC license is required for submission to the Directory of Open Access Journals (DOAJ).
The most common CC license for open access journals:
CC-BY: Articles published in Name of Journal are licensed under a Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by/4.0/.
OR
CC-BY-NA: Articles published in Name of Journal are licensed under a Creative Commons Attribution-NonCommercial 4.0 International License https://creativecommons.org/licenses/by-nc/4.0/.
CC FAQ: https://creativecommons.org/faq/