diff --git a/source/blender/blenlib/intern/convexhull_2d.c b/source/blender/blenlib/intern/convexhull_2d.c
index f17b6fd6095..e2e0a35d9bc 100644
--- a/source/blender/blenlib/intern/convexhull_2d.c
+++ b/source/blender/blenlib/intern/convexhull_2d.c
@@ -1,4 +1,5 @@
 /* SPDX-FileCopyrightText: 2023 Blender Foundation
+ * SPDX-FileCopyrightText: 2001 softSurfer (http://www.softsurfer.com)
  *
  * SPDX-License-Identifier: GPL-2.0-or-later */
 
diff --git a/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc b/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc
index 63f3fced07e..ed4df8a33a0 100644
--- a/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc
+++ b/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.cc
@@ -1,11 +1,11 @@
-/* SPDX-FileCopyrightText: (c) 2019 Stefano Quer.
+/* SPDX-FileCopyrightText: 2019 Stefano Quer
+   SPDX-FileCopyrightText: 2022 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-3.0-or-later
- * Additional code, copyright 2022 Blender Foundation
- *  *
+ *
  * Originally 6846114 from https://github.com/stefanoquer/graphISO/blob/master/v3
  * graphISO: Tools to compute the Maximum Common Subgraph between two graphs.
- *  */
+ */
 
 #include "uvedit_clipboard_graph_iso.hh"
 
diff --git a/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.hh b/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.hh
index d6c26402b97..418238afe16 100644
--- a/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.hh
+++ b/source/blender/editors/uvedit/uvedit_clipboard_graph_iso.hh
@@ -1,11 +1,11 @@
-/* SPDX-FileCopyrightText: (c) 2019 Stefano Quer.
+/* SPDX-FileCopyrightText: 2019 Stefano Quer
+   SPDX-FileCopyrightText: 2022 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-3.0-or-later
- * Additional code, copyright 2022 Blender Foundation
- *  *
+ *
  * Originally 6846114 from https://github.com/stefanoquer/graphISO/blob/master/v3
  * graphISO: Tools to compute the Maximum Common Subgraph between two graphs.
- *  */
+ */
 
 /** \file
  * \ingroup eduv
diff --git a/source/blender/io/usd/intern/usd_reader_camera.cc b/source/blender/io/usd/intern/usd_reader_camera.cc
index 75e38c7b877..843256f2275 100644
--- a/source/blender/io/usd/intern/usd_reader_camera.cc
+++ b/source/blender/io/usd/intern/usd_reader_camera.cc
@@ -1,8 +1,9 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
 
 #include "usd_reader_camera.h"
 
diff --git a/source/blender/io/usd/intern/usd_reader_camera.h b/source/blender/io/usd/intern/usd_reader_camera.h
index 30d4723fb85..d790379ce67 100644
--- a/source/blender/io/usd/intern/usd_reader_camera.h
+++ b/source/blender/io/usd/intern/usd_reader_camera.h
@@ -1,8 +1,10 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
+
 #pragma once
 
 #include "usd.h"
diff --git a/source/blender/io/usd/intern/usd_reader_nurbs.cc b/source/blender/io/usd/intern/usd_reader_nurbs.cc
index e1ddb763c7e..697767510e5 100644
--- a/source/blender/io/usd/intern/usd_reader_nurbs.cc
+++ b/source/blender/io/usd/intern/usd_reader_nurbs.cc
@@ -1,8 +1,9 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
 
 #include "usd_reader_nurbs.h"
 
diff --git a/source/blender/io/usd/intern/usd_reader_nurbs.h b/source/blender/io/usd/intern/usd_reader_nurbs.h
index 780076763eb..7bfc12f5902 100644
--- a/source/blender/io/usd/intern/usd_reader_nurbs.h
+++ b/source/blender/io/usd/intern/usd_reader_nurbs.h
@@ -1,8 +1,10 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
+
 #pragma once
 
 #include "usd.h"
diff --git a/source/blender/io/usd/intern/usd_reader_prim.cc b/source/blender/io/usd/intern/usd_reader_prim.cc
index af4b7fbfe73..41edf568083 100644
--- a/source/blender/io/usd/intern/usd_reader_prim.cc
+++ b/source/blender/io/usd/intern/usd_reader_prim.cc
@@ -1,8 +1,9 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
 
 #include "usd_reader_prim.h"
 
diff --git a/source/blender/io/usd/intern/usd_reader_prim.h b/source/blender/io/usd/intern/usd_reader_prim.h
index 22c7d06383a..7df5c4e3ea9 100644
--- a/source/blender/io/usd/intern/usd_reader_prim.h
+++ b/source/blender/io/usd/intern/usd_reader_prim.h
@@ -1,8 +1,10 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
+
 #pragma once
 
 #include "usd.h"
diff --git a/source/blender/io/usd/intern/usd_reader_xform.cc b/source/blender/io/usd/intern/usd_reader_xform.cc
index b3c0a59ca4a..c03458772be 100644
--- a/source/blender/io/usd/intern/usd_reader_xform.cc
+++ b/source/blender/io/usd/intern/usd_reader_xform.cc
@@ -1,8 +1,9 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
 
 #include "usd_reader_xform.h"
 
diff --git a/source/blender/io/usd/intern/usd_reader_xform.h b/source/blender/io/usd/intern/usd_reader_xform.h
index cbf3c26aa8e..851f6906d85 100644
--- a/source/blender/io/usd/intern/usd_reader_xform.h
+++ b/source/blender/io/usd/intern/usd_reader_xform.h
@@ -1,8 +1,10 @@
-/* SPDX-FileCopyrightText: 2023 Blender Foundation
+/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
+ * SPDX-FileCopyrightText: 2023 Blender Foundation
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
- * Adapted from the Blender Alembic importer implementation.
- * Modifications Copyright 2021 Tangent Animation. All rights reserved. */
+ *
+ * Adapted from the Blender Alembic importer implementation. */
+
 #pragma once
 
 #include "usd.h"