mPDF is written by Ian Back and is released under the GNU GPL v2 licence.
PHPePub is written by Asbjorn Grandt and is released under the GNU Lesser General Public License v2.1
phpMobi is written by Sander Kromwijk and is released under the Apache license (version 2.0)
Admin Page Framework is written by Michael Uno and is released under the followin licenses:
- Admin Page Framework (Framework Files) MIT license
- Admin Page Framework - Loader (WordPress Plugin) GPL v2