GNU Affero General Public License

The GNU Affero General Public License (GNU AGPL) is a free copyleft license published by the Free Software Foundation in November 2007, based on the GNU GPL version 3 and the Affero General Public License (non-GNU). It is intended for software designed to be run over a network, adding a provision requiring that the corresponding source code of modified versions of the software be prominently offered to all users who interact with the software over a network.

Source: Wikipedia — GNU Affero General Public License (CC BY-SA 4.0)