docs/introduction.rst: Add License Section (AGPL3)

debian/copyright

@@ -1,4 +1,4 @@
-Copyright (C) 2010-2018 Proxmox Server Solutions GmbH
+Copyright (C) 2019 Proxmox Server Solutions GmbH
 
 This software is written by Proxmox Server Solutions GmbH <support@proxmox.com>
 

docs/epilog.rst

@@ -23,3 +23,4 @@
 .. _Client-server model: https://en.wikipedia.org/wiki/Client-server_model
 .. _AE: https://en.wikipedia.org/wiki/Authenticated_encryption
 .. _GCM: https://en.wikipedia.org/wiki/Galois/Counter_Mode
+.. _AGPL3: https://www.gnu.org/licenses/agpl-3.0.en.html

docs/introduction.rst

@@ -90,6 +90,23 @@ Software Stack
 License
 -------
 
+Copyright (C) 2019 Proxmox Server Solutions GmbH
+
+This software is written by Proxmox Server Solutions GmbH <support@proxmox.com>
+
+Proxmox Backup is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+``WITHOUT ANY WARRANTY``; without even the implied warranty of
+``MERCHANTABILITY`` or ``FITNESS FOR A PARTICULAR PURPOSE``.  See the GNU
+Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see AGPL3_.
+
 
 
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