All published articles starting from Volume 6 Issue 4 2020 will be licensed under a Creative Commons Attribution-NonCommercial CC BY-NC 4.0, which allows others to remix, tweak, and build upon the authors' work non-commercially, and although their new works must also acknowledge the authors and be non-commercial, they don't have to license their derivative works on the same terms.
If the authors of the published articles would like to change the previous Creative Commons license (Creative Commons Attribution 4.0 International License) to the updated one, please contact us for the journal's author agreement.