How to choose a suitable license for your extension
From Joomla! Documentation
Revision as of 16:23, 18 April 2020 by M-b-o (JED category removed)
If you want to distribute your extension, you will need to choose a license carefully. Read Extensions and GPL for more information.
If you want to publish your extension on the Joomla Extensions Directory, you will need to make sure your license is compatible. Make sure you've read the JED Entries License Checklist before choosing a license.