All papers published in 4D Publishing Group are open access and distributed under Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Under this license, the Authors retain the copyright but license exclusive rights of their papers to be retained and used permanently open access to the 4D Publishing Group. The readers can review, copy, distribute, and share the paper on the condition that the original paper and source is properly cited under this license.

在4D出版集团发表的所有论文都是开放获取的，并在知识共享署名(CC BY)许可下分发(http://creativecommons.org/licenses/by/4.0/)。

在此许可下，作者保留其论文的版权，但保留其论文的专有权，并永久开放给4D出版集团使用。读者可以审查、复制、分发和共享论文，前提是原始论文和来源在本许可下被正确引用。