diff --git a/COPYING b/COPYING
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--- /dev/null
+++ b/COPYING
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+Copyright (C) 2020 by Thomas Lindner <tom@dl6tom.de>
+Copyright (C) 2020 by Cathy Hu <cathy.hu@fau.de>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+
+--------------------------------------------------------------------------------
+Note:
+Individual files contain the following tag instead of the full license text.
+
+ SPDX-License-Identifier: 0BSD
+
+This enables machine processing of license information based on the SPDX License
+Identifiers that are here available: http://spdx.org/licenses/