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  • I'm pretty sure this has been asked and answered before, but I can't find the previous Q&A. Commented Jan 15, 2019 at 6:08
  • Did you develop all of the software yourself (you own all the copyright) or are you including and redistributing other software or libraries (e.g. GPL software)? Commented Jan 15, 2019 at 6:09
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    If you wrote everything yourself then this should answer your question already: Can I change license of my GPL project? Commented Jan 15, 2019 at 6:11
  • @Brandin Thank you for the link. But that question doesn't fully answer if license A still applies to version 2 in my case. What if license A has a term that says it applies to all the upcoming versions? I haven't fully checked all the popular open source licenses for such terms. Commented Jan 15, 2019 at 6:44
  • It depends whether you wrote everything yourself or whether you included other licensed source code in your distribution. And if you included other open source software in your distribution, it depends on what the license of those open source libraries are (e.g. GPL). Commented Jan 15, 2019 at 6:51