On what license to choose, this talk by Adam Jacob is good:

https://www.youtube.com/watch?v=rmhYHzJpkuo

And if you want to read about open source vs source available, this GitHub with the Red Hat lawyer and co-author of GPLv2 provides a TLDR of the sentiment. The reference from Chad gives a deep dive into the discussion and origin of FSL’s language.

https://github.com/liquibase/liquibase/issues/7374