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The author retains the copyright. The publisher uses the following licence statement from issue 15 onwards:
All contents of this journal, excluding individual logos, images, sound files, videos and other artistic outputs are licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The authors may, if they wish, license artistic outputs to which they hold the copyright, under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The licence terms includes an exception for image, sound and video material which makes it possible for the author to exclude such material outside the CC 4.0 licence. The author may choose not to use the exception for individual works.
The licence is not applied to already published issues.