Copyright and Permission

• Copyright
  When publishing in Xinjiang Petroleum Geology (XPG) authors have two copyright options. 
  
  Authors can assign copyright to the journal. In this case the journal will publish the article under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) https://creativecommons.org/licenses/by-nc/4.0/. This licence allows: 
     Sharing —the material can be copied and redistributed in any medium or format.
     Adaptation — the material can be remixed, transformed, and built upon.
     Users must give appropriate credit, provide a link to the license, and indicate if changes were made. Users may do so in any reasonable manner, but not in     any  way that suggests the licensor endorses the use of the material.
     NonCommercial — Users may not use the material for commercial purposes.
   
  or 
  
  Authors can retain their copyright. In this case the journal will publish the article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/. This licence allows:
     Sharing —the material can be copied and redistributed in any medium or format. 
     Adaptation — the material can be remixed, transformed, and built upon. 
     Users must give appropriate credit, provide a link to the license, and indicate if changes were made. Users may do so in any reasonable manner, but not in  any  way that suggests the licensor endorses the use of the material.
     Commercial use — Users may use the material for any purpose, even commercially. 
  
  
  
  Permission
  Please be careful to check the Copyright status of an article before reproducing or reusing any of the content. 
  
  Where the Copyright is held by the journal i.e. Copyright © 2018 Xinjiang Petroleum Geology, it is published under the terms of the Creative Commons Attribution-NonCommercial License 4.0. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. Users may not use the material for commercial purposes. 
  
  Where the Copyright is held by the authors (e.g., © 2018 John Brown, Joe Green, Joan White/CC-BY-4.0) it is published under the Creative Commons Attribution 4.0 International (CC BY 4.0 http://creativecommons.org/licenses/by/4.0/). Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. This license also permits commercial and non-commercial re-use of an open access article.
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