Clarify licenses

- add license headers to everything
- convert a few files from public domain or LGPL2.1+ to GPL2+
- some archaeology to clarify which files are from which library

1 files changed, 8 insertions, 19 deletions

diff --git a/src/io/registrytool.cpp b/src/io/registrytool.cpp
index 89442bc36..169e49721 100644
--- a/src/io/registrytool.cpp
+++ b/src/io/registrytool.cpp
@@ -1,24 +1,13 @@
-/*
- * Inkscape Registry Tool
- *
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * Inkscape registry tool
+ *//*
  * Authors:
+ *   see git history
  *   Bob Jamison
- *
- * Copyright (C) 2005-2008 Bob Jamison
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Lesser General Public
- *  License as published by the Free Software Foundation; either
- *  version 2.1 of the License, or (at your option) any later version.
- *
- *  This library 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
- *  Lesser General Public License for more details.
- *
- *  You should have received a copy of the GNU Lesser General Public
- *  License along with this library; if not, write to the Free Software
- *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * Copyright (C) 2005-2018 Authors
+ * 
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include "registrytool.h"