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

30 files changed, 159 insertions, 149 deletions

diff --git a/src/helper/CMakeLists.txt b/src/helper/CMakeLists.txt
index 7b6b548b9..f1a2e7105 100644
--- a/src/helper/CMakeLists.txt
+++ b/src/helper/CMakeLists.txt
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 include(${CMAKE_SOURCE_DIR}/CMakeScripts/UseGlibMarshal.cmake)
 
diff --git a/src/helper/action-context.cpp b/src/helper/action-context.cpp
index e9299f7eb..648101540 100644
--- a/src/helper/action-context.cpp
+++ b/src/helper/action-context.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ActionContext implementation.
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2013 Eric Greveson
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include "desktop.h"
diff --git a/src/helper/action-context.h b/src/helper/action-context.h
index bb538f413..2660bc59c 100644
--- a/src/helper/action-context.h
+++ b/src/helper/action-context.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /** \file
  * Inkscape UI action context implementation
  *//*
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2013 Eric Greveson
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #ifndef SEEN_INKSCAPE_ACTION_CONTEXT_H
diff --git a/src/helper/action.cpp b/src/helper/action.cpp
index 6d14037f0..7df15c9c1 100644
--- a/src/helper/action.cpp
+++ b/src/helper/action.cpp
@@ -1,12 +1,13 @@
-/*
- * SPAction implementation.
- *
- * Author:
- *   Lauris Kaplinski <lauris@kaplinski.com>
- *
- * Copyright (C) 2003 Lauris Kaplinski
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Inkscape UI action implementation
+ *//*
+ * Authors:
+ * see git history
+ * Lauris Kaplinski <lauris@kaplinski.com>
  *
- * This code is in public domain
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include "helper/action.h"
diff --git a/src/helper/action.h b/src/helper/action.h
index d731f2884..1f871dbaa 100644
--- a/src/helper/action.h
+++ b/src/helper/action.h
@@ -1,12 +1,13 @@
-/** \file
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * Inkscape UI action implementation
  *//*
- * Author:
- *   Lauris Kaplinski <lauris@kaplinski.com>
+ * Authors:
+ * see git history
+ * Lauris Kaplinski <lauris@kaplinski.com>
  *
- * Copyright (C) 2003 Lauris Kaplinski
- *
- * This code is in public domain
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #ifndef SEEN_INKSCAPE_SP_ACTION_H
diff --git a/src/helper/geom-curves.h b/src/helper/geom-curves.h
index 7357403f7..08403e2ae 100644
--- a/src/helper/geom-curves.h
+++ b/src/helper/geom-curves.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 #ifndef INKSCAPE_HELPER_GEOM_CURVES_H
 #define INKSCAPE_HELPER_GEOM_CURVES_H
 
@@ -11,7 +12,7 @@
  *
  * Copyright (C) 2008-2009 Johan Engelen
  *
- * Released under GNU GPL
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <2geom/line.h>
diff --git a/src/helper/geom-nodetype.cpp b/src/helper/geom-nodetype.cpp
index da620b3fd..e04b08dbd 100644
--- a/src/helper/geom-nodetype.cpp
+++ b/src/helper/geom-nodetype.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Specific nodetype geometry functions for Inkscape, not provided my lib2geom.
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2008 Johan Engelen
  *
- * Released under GNU GPL
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include "helper/geom-nodetype.h"
diff --git a/src/helper/geom-nodetype.h b/src/helper/geom-nodetype.h
index e3953a65d..d7d4d4c02 100644
--- a/src/helper/geom-nodetype.h
+++ b/src/helper/geom-nodetype.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 #ifndef INKSCAPE_HELPER_GEOM_NODETYPE_H
 #define INKSCAPE_HELPER_GEOM_NODETYPE_H
 
@@ -11,7 +12,7 @@
  *
  * Copyright (C) 2008 Johan Engelen
  *
- * Released under GNU GPL
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <2geom/forward.h>
diff --git a/src/helper/geom-pathstroke.cpp b/src/helper/geom-pathstroke.cpp
index 1736f9b16..d1ed7898d 100644
--- a/src/helper/geom-pathstroke.cpp
+++ b/src/helper/geom-pathstroke.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Authors:
  *   Liam P. White
  *   Tavmjong Bah
@@ -5,7 +6,7 @@
  *
  * Copyright (C) 2014-2015 Authors
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <iomanip>
diff --git a/src/helper/geom-pathstroke.h b/src/helper/geom-pathstroke.h
index 4e4b8b91e..73d35b402 100644
--- a/src/helper/geom-pathstroke.h
+++ b/src/helper/geom-pathstroke.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 #ifndef INKSCAPE_HELPER_PATH_STROKE_H
 #define INKSCAPE_HELPER_PATH_STROKE_H
 
@@ -7,7 +8,7 @@
  *
  * Copyright (C) 2014-2015 Authors
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <2geom/path.h>
diff --git a/src/helper/geom-pathvectorsatellites.cpp b/src/helper/geom-pathvectorsatellites.cpp
index 861af0e04..2516181cb 100644
--- a/src/helper/geom-pathvectorsatellites.cpp
+++ b/src/helper/geom-pathvectorsatellites.cpp
@@ -1,18 +1,21 @@
-/**
- * \file
- * \brief PathVectorSatellites a class to manage satellites -per node extra data- in a pathvector
- */ /*
-    * Authors:
-    * Jabiertxof
-    * Nathan Hurst
-    * Johan Engelen
-    * Josh Andler
-    * suv
-    * Mc-
-    * Liam P. White
-    * Krzysztof Kosiński
-    * This code is in public domain
-    */
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * PathVectorSatellites a class to manage satellites -per node extra data- in a pathvector
+ *//*
+ * Authors: see git history
+ * Jabiertxof
+ * Nathan Hurst
+ * Johan Engelen
+ * Josh Andler
+ * suv
+ * Mc-
+ * Liam P. White
+ * Krzysztof Kosiński
+ * This code is in public domain
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 
 #include <helper/geom-pathvectorsatellites.h>
 #include "util/units.h"
diff --git a/src/helper/geom-pathvectorsatellites.h b/src/helper/geom-pathvectorsatellites.h
index e95458a91..3009081bb 100644
--- a/src/helper/geom-pathvectorsatellites.h
+++ b/src/helper/geom-pathvectorsatellites.h
@@ -1,18 +1,21 @@
-/**
- * \file
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * \brief PathVectorSatellites a class to manage satellites -per node extra data- in a pathvector
- */ /*
-    * Authors:
-    * Jabiertxof
-    * Nathan Hurst
-    * Johan Engelen
-    * Josh Andler
-    * suv
-    * Mc-
-    * Liam P. White
-    * Krzysztof Kosiński
-    * This code is in public domain
-    */
+ *//*
+ * Authors: see git history
+ * Jabiertxof
+ * Nathan Hurst
+ * Johan Engelen
+ * Josh Andler
+ * suv
+ * Mc-
+ * Liam P. White
+ * Krzysztof Kosiński
+ *
+ * Copyright (C) 2017 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
 
 #ifndef SEEN_PATHVECTORSATELLITES_H
 #define SEEN_PATHVECTORSATELLITES_H
diff --git a/src/helper/geom-satellite.cpp b/src/helper/geom-satellite.cpp
index 9cd6a3889..8049c861d 100644
--- a/src/helper/geom-satellite.cpp
+++ b/src/helper/geom-satellite.cpp
@@ -1,12 +1,14 @@
-/**
- * \file
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * \brief Satellite a per node holder of data.
- */ /*
-    * Authors:
-    * 2015 Jabier Arraiza Cenoz<jabier.arraiza@marker.es>
-    *
-    * This code is in public domain
-    */
+ *//*
+ * Authors:
+ * see git history
+ * 2015 Jabier Arraiza Cenoz<jabier.arraiza@marker.es>
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 
 #include <helper/geom-satellite.h>
 #include <2geom/curve.h>
@@ -15,7 +17,7 @@
 #include <2geom/sbasis-to-bezier.h>
 #include <2geom/ray.h>
 #include <boost/optional.hpp>
-//log cache
+// log cache
 #ifdef _WIN32
 #include <Windows.h>
 #else
diff --git a/src/helper/geom-satellite.h b/src/helper/geom-satellite.h
index c9cf84308..5fbcae159 100644
--- a/src/helper/geom-satellite.h
+++ b/src/helper/geom-satellite.h
@@ -1,12 +1,14 @@
-/**
- * \file
- * \brief Satellite a per node holder of data.
- */ /*
-    * Authors:
-    * 2015 Jabier Arraiza Cenoz<jabier.arraiza@marker.es>
-    *
-    * This code is in public domain
-    */
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Satellite -- a per node holder of data.
+ *//*
+ * Authors:
+ * see git history
+ * Jabier Arraiza Cenoz<jabier.arraiza@marker.es>
+ *
+ * Copyright (C) 2017 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 
 #ifndef SEEN_SATELLITE_H
 #define SEEN_SATELLITE_H
diff --git a/src/helper/geom.cpp b/src/helper/geom.cpp
index 253188f1d..e1d48580c 100644
--- a/src/helper/geom.cpp
+++ b/src/helper/geom.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Specific geometry functions for Inkscape, not provided my lib2geom.
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2008 Johan Engelen
  *
- * Released under GNU GPL
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <algorithm>
diff --git a/src/helper/geom.h b/src/helper/geom.h
index b3d907e51..b0e3f2b7d 100644
--- a/src/helper/geom.h
+++ b/src/helper/geom.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 #ifndef INKSCAPE_HELPER_GEOM_H
 #define INKSCAPE_HELPER_GEOM_H
 
@@ -11,7 +12,7 @@
  *
  * Copyright (C) 2008 Johan Engelen
  *
- * Released under GNU GPL
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <2geom/forward.h>
diff --git a/src/helper/gettext.cpp b/src/helper/gettext.cpp
index 0bd3da06a..dd27f9f78 100644
--- a/src/helper/gettext.cpp
+++ b/src/helper/gettext.cpp
@@ -1,26 +1,13 @@
-/**
- * \file
- * \brief helper functions for gettext
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * helper functions for gettext
  *//*
  * Authors:
+ * see git history
  *   Eduard Braun <eduard.braun2@gmx.de>
  *
- * Copyright 2017 Authors
- *
- * This file is part of Inkscape.
- *
- * Inkscape 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 2 of the License, or
- * (at your option) any later version.
- *
- * Inkscape 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 Inkscape.  If not, see <http://www.gnu.org/licenses/>.
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/helper/gettext.h b/src/helper/gettext.h
index ecffcdc07..5a3716386 100644
--- a/src/helper/gettext.h
+++ b/src/helper/gettext.h
@@ -1,26 +1,13 @@
-/**
- * \file
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * \brief helper functions for gettext
  *//*
  * Authors:
+ * see git history
  *   Eduard Braun <eduard.braun2@gmx.de>
  *
- * Copyright 2017 Authors
- *
- * This file is part of Inkscape.
- *
- * Inkscape 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 2 of the License, or
- * (at your option) any later version.
- *
- * Inkscape 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 Inkscape.  If not, see <http://www.gnu.org/licenses/>.
+ * Copyright (C) 2017 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #ifndef SEEN_GETTEXT_HELPER_H
@@ -43,4 +30,4 @@ namespace Inkscape {
   fill-column:99
   End:
 */
-// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99:
\ No newline at end of file
+// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99:
diff --git a/src/helper/icon-loader.cpp b/src/helper/icon-loader.cpp
index 25c6eb32b..7116c2eaf 100644
--- a/src/helper/icon-loader.cpp
+++ b/src/helper/icon-loader.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Icon Loader
  *
@@ -6,7 +7,7 @@
  * Authors:
  *  Jabiertxo Arraiza <jabier.arraiza@marker.es>
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include "icon-loader.h"
diff --git a/src/helper/icon-loader.h b/src/helper/icon-loader.h
index 38a41fcfb..1555871c3 100644
--- a/src/helper/icon-loader.h
+++ b/src/helper/icon-loader.h
@@ -1,15 +1,17 @@
-#ifndef SEEN_INK_ICON_LOADER_H
-#define SEEN_INK_ICON_LOADER_H
-
-/*
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * Icon Loader
- *
- *
+ *//*
  * Authors:
- *  Jabiertxo Arraiza <jabier.arraiza@marker.es>
- *
+ * see git history
+ * Jabiertxo Arraiza <jabier.arraiza@marker.es>
  *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
+#ifndef SEEN_INK_ICON_LOADER_H
+#define SEEN_INK_ICON_LOADER_H
+
 #include <gdkmm/pixbuf.h>
 #include <gtkmm/box.h>
 #include <gtkmm/image.h>
diff --git a/src/helper/mathfns.h b/src/helper/mathfns.h
index 8fb88dc26..3fa51a09b 100644
--- a/src/helper/mathfns.h
+++ b/src/helper/mathfns.h
@@ -1,12 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * ... some mathmatical functions 
+ * ... some mathmatical functions
  *
  * Authors:
  *   Johan Engelen <goejendaagh@zonnet.nl>
  *
  * Copyright (C) 2007 Johan Engelen
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #ifndef SEEN_INKSCAPE_UTIL_MATHFNS_H
diff --git a/src/helper/pixbuf-ops.cpp b/src/helper/pixbuf-ops.cpp
index 3a853ed23..cfb6f8836 100644
--- a/src/helper/pixbuf-ops.cpp
+++ b/src/helper/pixbuf-ops.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Helpers for SPItem -> gdk_pixbuf related stuff
  *
@@ -8,7 +9,7 @@
  *
  * Copyright (C) 2008 John Cliff
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <2geom/transforms.h>
diff --git a/src/helper/pixbuf-ops.h b/src/helper/pixbuf-ops.h
index 6f326a286..d56579ef9 100644
--- a/src/helper/pixbuf-ops.h
+++ b/src/helper/pixbuf-ops.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 #ifndef __SP_PIXBUF_OPS_H__
 #define __SP_PIXBUF_OPS_H__
 
@@ -9,7 +10,7 @@
  *
  * Copyright (C) 2008 John Cliff
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <glib.h>
diff --git a/src/helper/png-write.cpp b/src/helper/png-write.cpp
index 0358bc5d7..6af505278 100644
--- a/src/helper/png-write.cpp
+++ b/src/helper/png-write.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PNG file format utilities
  *
@@ -10,7 +11,7 @@
  *
  * Copyright (C) 1999-2002 authors
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <png.h>
diff --git a/src/helper/png-write.h b/src/helper/png-write.h
index b886158c9..8d1aa97e9 100644
--- a/src/helper/png-write.h
+++ b/src/helper/png-write.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 #ifndef SEEN_SP_PNG_WRITE_H
 #define SEEN_SP_PNG_WRITE_H
 
@@ -11,7 +12,7 @@
  *
  * Copyright (C) 1999-2002 Lauris Kaplinski
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <2geom/forward.h>
diff --git a/src/helper/sp-marshal.list b/src/helper/sp-marshal.list
index ba5c3a889..340d2c5c4 100644
--- a/src/helper/sp-marshal.list
+++ b/src/helper/sp-marshal.list
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # marshallers for inkscape
 VOID:POINTER,UINT
 BOOLEAN:POINTER
diff --git a/src/helper/stock-items.cpp b/src/helper/stock-items.cpp
index dbd9e6826..16b90c23f 100644
--- a/src/helper/stock-items.cpp
+++ b/src/helper/stock-items.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Stock-items
  *
@@ -11,7 +12,7 @@
  * Copyright 2004 John Cliff
  *
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #define noSP_SS_VERBOSE
diff --git a/src/helper/stock-items.h b/src/helper/stock-items.h
index a0e5cc2a3..0d1bb20fc 100644
--- a/src/helper/stock-items.h
+++ b/src/helper/stock-items.h
@@ -1,17 +1,16 @@
-#ifndef SEEN_INK_STOCK_ITEMS_H
-#define SEEN_INK_STOCK_ITEMS_H
-
-/*
- * Stock-items
- *
- * Stock Item management code
- *
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
  * Authors:
- *  John Cliff <simarilius@yahoo.com>
- *
- * Copyright 2004 John Cliff
+ * see git history
+ * John Cliff <simarilius@yahoo.com>
  *
+ * Copyright (C) 2012 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
+#ifndef SEEN_INK_STOCK_ITEMS_H
+#define SEEN_INK_STOCK_ITEMS_H
 
 #include <glib.h>
 
diff --git a/src/helper/window.cpp b/src/helper/window.cpp
index 28fc25606..d51e92358 100644
--- a/src/helper/window.cpp
+++ b/src/helper/window.cpp
@@ -1,10 +1,13 @@
-/**
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * Generic window implementation
+ *//*
+ * Authors:
+ * see git history
+ * Lauris Kaplinski <lauris@kaplinski.com>
  *
- * Author:
- *   Lauris Kaplinski <lauris@kaplinski.com>
- *
- * This code is in public domain
+ * Copyright (C) 2017 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <glibmm.h>
diff --git a/src/helper/window.h b/src/helper/window.h
index a0efcd292..cd303d0b9 100644
--- a/src/helper/window.h
+++ b/src/helper/window.h
@@ -1,14 +1,16 @@
-#ifndef SEEN_SP_WINDOW_H
-#define SEEN_SP_WINDOW_H
-
-/**
- * Generic window implementation
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors:
+ * see git history
+ * Lauris Kaplinski <lauris@kaplinski.com>
  *
- * Author:
- *   Lauris Kaplinski <lauris@kaplinski.com>
- *
- * This code is in public domain
+ * Copyright (C) 2014 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
+#ifndef SEEN_SP_WINDOW_H
+#define SEEN_SP_WINDOW_H
 
 struct _GtkWidget;
 typedef _GtkWidget GtkWidget;