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diff --git a/generic/proof-tree.el b/generic/proof-tree.el
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--- a/generic/proof-tree.el
+++ b/generic/proof-tree.el
@@ -1,11 +1,18 @@
;;; tree-tree.el --- Proof General prooftree communication.
-;;
-;; Copyright (C) 2012 Hendrik Tews
+
+;; This file is part of Proof General.
+
+;; Portions © Copyright 1994-2012 David Aspinall and University of Edinburgh
+;; Portions © Copyright 2003, 2012, 2014 Free Software Foundation, Inc.
+;; Portions © Copyright 2001-2017 Pierre Courtieu
+;; Portions © Copyright 2010, 2016 Erik Martin-Dorel
+;; Portions © Copyright 2011-2013, 2016-2017 Hendrik Tews
+;; Portions © Copyright 2015-2017 Clément Pit-Claudel
+
;; Authors: Hendrik Tews
+
;; License: GPL (GNU GENERAL PUBLIC LICENSE)
-;;
-;; $Id$
-;;
+
;;; Commentary:
;;
;; Generic code for the communication with prooftree. Prooftree