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Thank you for reviewing!
One question: I have now email contact to the original author and I asked for changing the license to GPL.

My message:
I am interested in working on the SSJ.
I had made some significant changes now so that it is in good flight
conditions.
May I change the license to GPL?
https://github.com/HerbyW
Greetings from Germany,
HerbyW

His answer was:
Good day,
sure go ahead please and good luck..
Cheers

Do you think that I may change it now?