Main license file.

LICENSE.txt

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+ZeroTier One - Network Virtualization Everywhere
+Copyright (C) 2011-2017  ZeroTier, Inc.  https://www.zerotier.com/
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+See LICENSE.GPL-3 for the full GNU GPL v3 license.
+
+--
+
+You can be released from the requirements of the license by purchasing
+a commercial license. Buying such a license is mandatory as soon as you
+develop commercial closed-source software that incorporates or links
+directly against ZeroTier software without disclosing the source code
+of your own application.
+
+--
+
+The above license does not apply to third party code included with or
+linked against by ZeroTier software. See the third party code section
+of the AUTHORS.md for an index of third party software included in
+this software repository.
+
+Licenses for third party code are all relatively permissive: MIT,
+BSD, and public domain. The only exception is the tap-windows driver
+which is under the GPLv2, but this is only needed to produce the
+binary tap device driver used by the ZeroTier service on Windows.