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Re:TDLib – Build Your Own Telegram Client by eitland on Thursday February 01, 2018 @07:35AM (#16281395)
QT was very liberally licensed for a while. Are they back to copyleft or something now?
Re:TDLib – Build Your Own Telegram Client by Aissen on Thursday February 01, 2018 @07:42AM (#16281435)
It started moving from LGPLv2.1 to LGPLv3 in Qt 5.4 with new features, and is now the norm since Qt 5.7 (latest in 5.10):

http://blog.qt.io/blog/2014/08/20/adding-lgpl-v3-to-qt/

https://www1.qt.io/faq/#_Toc_1_2