LICENSE.txt

Stratus is distributed under the GNU General Public License Version 2.0 license:

  Copyright (C) 2019 Planet Labs Inc.

  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 2
  of the License, or (at your option) any later version.

  As an exception to the terms of the GPL, you may copy, modify,
  propagate, and distribute a work formed by combining Stratus with the
  EMF, XSD and OSHI Libraries, or a work derivative of such a combination, even if
  such copying, modification, propagation, or distribution would otherwise
  violate the terms of the GPL. Nothing in this exception exempts you from
  complying with the GPL in all respects for all of the code used other
  than the EMF, XSD and OSHI Libraries. You may include this exception and its grant
  of permissions when you distribute Stratus.  Inclusion of this notice
  with such a distribution constitutes a grant of such permissions.  If
  you do not wish to grant these permissions, remove this paragraph from
  your distribution. "Stratus" means the Stratus software licensed
  under version 2 or any later version of the GPL, or a work based on such
  software and licensed under the GPL. "EMF, XSD and OSHI Libraries" means 
  Eclipse Modeling Framework Project and XML Schema Definition software
  distributed by the Eclipse Foundation and the OSHI library, all licensed 
  under the Eclipse Public License Version 1.0 ("EPL"), or a work based on 
  such software and licensed under the EPL.

  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, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

The full GPL license is available in this directory in the file GPL.txt