license?
                  
                  
                   It is possible to make modified versions of the GPL, but it tends to have practical consequences.
                  
                  
                  
                  
                  
                  https://www.gnu.org/licenses/gpl-faq.en.html#ModifyGPL
                  
                  
                  
                  
                  
                   if you want to be sure, email them to ask about it
                  
                  
                
This does not concern license that someone else is already using
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