The issue about compatibility of Creative Commons licenses is complicated. The incompatibility among different Creative Commons licenses is decided by creators' preference. It is necessary to respect the authors and reserve the incompatibility. If Creative Commons cancels the Porting Project, the number of versions of the same Creative Commons license will be reduced and the issue of incompatibility will be alleviated greatly. Creative Commons are trying to solve the incompatibility problem between the Creative Commons licenses and other open licenses such as the GNU Free Documentation License, the Free Art License and the GNU General Public License. Creative Commons decides to revise the definition of "Creative Commons Compatible License" in version 4.0.
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[28] 4.0 compatibility[EB/OL].[2013-10-01].http://wiki.creativecommons.org/4.0/Compatibility.
[29] 4.0 treatment of adaptations[EB/OL].[2013-10-01].http://wiki.creativecommons.org/4.0/Treatment_of_adaptations.
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