chore: apply GPL3

1 files changed, 17 insertions, 0 deletions

diff --git a/README.md b/README.md
index 10c545e..f3c26e6 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,20 @@ files haven't changed, the output is identical.
 
 This is meant for testing that a backup has been restored correctly.
 
+
+# Legalese
+
+Copyright 2020  Lars Wirzenius
+
+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/>.