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

18 files changed, 98 insertions, 24 deletions

diff --git a/testfiles/src/attributes-test.cpp b/testfiles/src/attributes-test.cpp
index c211fadb5..808760e1e 100644
--- a/testfiles/src/attributes-test.cpp
+++ b/testfiles/src/attributes-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 /*
  * Unit tests for attributes.
@@ -7,7 +8,7 @@
  *
  * Copyright (C) 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 <string>
diff --git a/testfiles/src/color-profile-test.cpp b/testfiles/src/color-profile-test.cpp
index 17b74bba1..dcee8427a 100644
--- a/testfiles/src/color-profile-test.cpp
+++ b/testfiles/src/color-profile-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Unit tests for color profile.
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 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 "gtest/gtest.h"
diff --git a/testfiles/src/cxxtests-to-migrate/extract-uri-test.h b/testfiles/src/cxxtests-to-migrate/extract-uri-test.h
index e795960a9..189318cef 100644
--- a/testfiles/src/cxxtests-to-migrate/extract-uri-test.h
+++ b/testfiles/src/cxxtests-to-migrate/extract-uri-test.h
@@ -1,3 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 
 #ifndef SEEN_EXTRACT_URI_TEST_H
 #define SEEN_EXTRACT_URI_TEST_H
diff --git a/testfiles/src/cxxtests-to-migrate/marker-test.h b/testfiles/src/cxxtests-to-migrate/marker-test.h
index bf7e1040a..1a77aff1d 100644
--- a/testfiles/src/cxxtests-to-migrate/marker-test.h
+++ b/testfiles/src/cxxtests-to-migrate/marker-test.h
@@ -1,10 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /** @file
  * @brief Unit tests for SVG marker handling
- */
-/* Authors:
+ *//*
+ * Authors:
+ * see git history
  *   Johan Engelen <goejendaagh@zonnet.nl>
  *
- * This file is released into the public domain.
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <cxxtest/TestSuite.h>
diff --git a/testfiles/src/cxxtests-to-migrate/mod360-test.h b/testfiles/src/cxxtests-to-migrate/mod360-test.h
index 932361eb3..12ee994ff 100644
--- a/testfiles/src/cxxtests-to-migrate/mod360-test.h
+++ b/testfiles/src/cxxtests-to-migrate/mod360-test.h
@@ -1,3 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 
 #ifndef SEEN_MOD_360_TEST_H
 #define SEEN_MOD_360_TEST_H
diff --git a/testfiles/src/cxxtests-to-migrate/preferences-test.h b/testfiles/src/cxxtests-to-migrate/preferences-test.h
index 92cb14247..0dc04b8ec 100644
--- a/testfiles/src/cxxtests-to-migrate/preferences-test.h
+++ b/testfiles/src/cxxtests-to-migrate/preferences-test.h
@@ -1,10 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /** @file
  * @brief Unit tests for the Preferences object
- */
-/* Authors:
+ *//*
+ * Authors:
+ * see git history
  *   Krzysztof Kosiński <tweenk.pl@gmail.com>
  *
- * This file is released into the public domain.
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 
 #include <cxxtest/TestSuite.h>
diff --git a/testfiles/src/cxxtests-to-migrate/sp-style-elem-test.h b/testfiles/src/cxxtests-to-migrate/sp-style-elem-test.h
index 6f65a48ea..271f319a0 100644
--- a/testfiles/src/cxxtests-to-migrate/sp-style-elem-test.h
+++ b/testfiles/src/cxxtests-to-migrate/sp-style-elem-test.h
@@ -1,3 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 #ifndef SEEN_SP_STYLE_ELEM_TEST_H
 #define SEEN_SP_STYLE_ELEM_TEST_H
 
diff --git a/testfiles/src/cxxtests-to-migrate/test-helpers.h b/testfiles/src/cxxtests-to-migrate/test-helpers.h
index d30449ebb..bae8ab34f 100644
--- a/testfiles/src/cxxtests-to-migrate/test-helpers.h
+++ b/testfiles/src/cxxtests-to-migrate/test-helpers.h
@@ -1,3 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 #ifndef SEEN_TEST_HELPERS_H
 #define SEEN_TEST_HELPERS_H
 
diff --git a/testfiles/src/cxxtests-to-migrate/uri-test.h b/testfiles/src/cxxtests-to-migrate/uri-test.h
index 2a4cdab46..118546b51 100644
--- a/testfiles/src/cxxtests-to-migrate/uri-test.h
+++ b/testfiles/src/cxxtests-to-migrate/uri-test.h
@@ -1,15 +1,20 @@
-
-#ifndef SEEN_URI_TEST_H
-#define SEEN_URI_TEST_H
-/*
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * Test uri.h
  *
  * Written to aid with refactoring the uri handling to support fullPath
  * and data URIs and also cover code which wasn't before tested.
+ *//*
+ * Authors:
+ * 2014 BasisTech Boston
  *
- * Copyright 2014 (c) BasisTech Boston
- *
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
+
+#ifndef SEEN_URI_TEST_H
+#define SEEN_URI_TEST_H
+
 #include <cxxtest/TestSuite.h>
 
 #include "uri.h"
diff --git a/testfiles/src/cxxtests-to-migrate/verbs-test.h b/testfiles/src/cxxtests-to-migrate/verbs-test.h
index 04a0b80c0..b8fd29936 100644
--- a/testfiles/src/cxxtests-to-migrate/verbs-test.h
+++ b/testfiles/src/cxxtests-to-migrate/verbs-test.h
@@ -1,3 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
 
 
 #include <cxxtest/TestSuite.h>
diff --git a/testfiles/src/dir-util-test.cpp b/testfiles/src/dir-util-test.cpp
index d2e888e7d..25081771a 100644
--- a/testfiles/src/dir-util-test.cpp
+++ b/testfiles/src/dir-util-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Unit tests for dir utils.
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 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 "gtest/gtest.h"
diff --git a/testfiles/src/object-set-test.cpp b/testfiles/src/object-set-test.cpp
index 848a599c0..91c1dc5f7 100644
--- a/testfiles/src/object-set-test.cpp
+++ b/testfiles/src/object-set-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Multiindex container for selection
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2016 Adrian Boguszewski
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 #include <gtest/gtest.h>
 #include <doc-per-case-test.h>
diff --git a/testfiles/src/object-style-test.cpp b/testfiles/src/object-style-test.cpp
index 391c5874a..7b73b43c2 100644
--- a/testfiles/src/object-style-test.cpp
+++ b/testfiles/src/object-style-test.cpp
@@ -1,12 +1,14 @@
-/*
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
  * Combination style and object testing for cascading and flags.
+ *//*
  *
  * Authors:
  *   Martin Owens
  *
  * Copyright (C) 2018 Authors
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL version 2 or later, read the file 'COPYING' for more information
  */
 
 #include <gtest/gtest.h>
diff --git a/testfiles/src/object-test.cpp b/testfiles/src/object-test.cpp
index 565fc1b12..56e067ab2 100644
--- a/testfiles/src/object-test.cpp
+++ b/testfiles/src/object-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Unit tests migrated from cxxtest
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2018 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 <gtest/gtest.h>
diff --git a/testfiles/src/sp-gradient-test.cpp b/testfiles/src/sp-gradient-test.cpp
index 96da055cb..b3347b576 100644
--- a/testfiles/src/sp-gradient-test.cpp
+++ b/testfiles/src/sp-gradient-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Unit tests migrated from cxxtest
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2018 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 <gtest/gtest.h>
diff --git a/testfiles/src/sp-object-test.cpp b/testfiles/src/sp-object-test.cpp
index fdd541d1a..a00cdaf24 100644
--- a/testfiles/src/sp-object-test.cpp
+++ b/testfiles/src/sp-object-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Multiindex container for selection
  *
@@ -6,7 +7,7 @@
  *
  * Copyright (C) 2016 Adrian Boguszewski
  *
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
 #include <gtest/gtest.h>
 #include <src/object/sp-object.h>
diff --git a/testfiles/src/style-test.cpp b/testfiles/src/style-test.cpp
index d7246132c..1d34e7bef 100644
--- a/testfiles/src/style-test.cpp
+++ b/testfiles/src/style-test.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 /*
  * Unit test for style properties.
@@ -7,7 +8,7 @@
  *
  * Copyright (C) 2017 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 <string>
diff --git a/testfiles/src/uri-test.cpp b/testfiles/src/uri-test.cpp
index c10012d49..847bc4953 100644
--- a/testfiles/src/uri-test.cpp
+++ b/testfiles/src/uri-test.cpp
@@ -1,9 +1,17 @@
-/*
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
  * Test Inkscape::URI
+ */
+/*
+ * Authors:
+ *   Thomas Holder
  *
- * Copyright 2018 (c) Thomas Holder
+ * Copyright (C) 2018 Authors
  *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
  */
+
 #include "object/uri.h"
 #include "gtest/gtest.h"