Authentic and Authentic 2 are copyrighted by Entr’ouvert and are licensed through the GNU AFFERO GENERAL PUBLIC LICENSE, version 3 or later. A copy of the whole license text is available in the COPYING file.
The OpenID IdP originates in the project django_openid_provider by Roman Barczyski, which is under the Apache 2.0 licence. This imply that you must distribute authentic2 under the AGPL3 licence when distributing this part of the project which is the only AGPL licence version compatible with the Apache 2.0 licence.
The Documentation is under the licence Creative Commons CC BY-SA 2.0.