EchoviewR is licenced under GPL-3.

LICENSE.md

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+This file is part of EchoviewR.
+
+EchoviewR 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.
+
+EchoviewR 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 EchoviewR.  If not, see <http://www.gnu.org/licenses/>.