diff --git a/src/Mod/MeshPart/App/AppMeshPart.cpp b/src/Mod/MeshPart/App/AppMeshPart.cpp
index 3eed116924..0a2a755c9b 100644
--- a/src/Mod/MeshPart/App/AppMeshPart.cpp
+++ b/src/Mod/MeshPart/App/AppMeshPart.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/AppMeshPartPy.cpp b/src/Mod/MeshPart/App/AppMeshPartPy.cpp
index 718df0ba13..37f53ce0e4 100644
--- a/src/Mod/MeshPart/App/AppMeshPartPy.cpp
+++ b/src/Mod/MeshPart/App/AppMeshPartPy.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/CMakeLists.txt b/src/Mod/MeshPart/App/CMakeLists.txt
index 920424fc77..85fd4b24ce 100644
--- a/src/Mod/MeshPart/App/CMakeLists.txt
+++ b/src/Mod/MeshPart/App/CMakeLists.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 add_library(MeshPart SHARED)
 
 if (SMESH_FOUND)
diff --git a/src/Mod/MeshPart/App/CurveProjector.cpp b/src/Mod/MeshPart/App/CurveProjector.cpp
index 4bb476690b..ef86dc1e31 100644
--- a/src/Mod/MeshPart/App/CurveProjector.cpp
+++ b/src/Mod/MeshPart/App/CurveProjector.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Juergen Riegel <juergen.riegel@web.de>             *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/CurveProjector.h b/src/Mod/MeshPart/App/CurveProjector.h
index 0d0a3262e9..c23e165f9a 100644
--- a/src/Mod/MeshPart/App/CurveProjector.h
+++ b/src/Mod/MeshPart/App/CurveProjector.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Juergen Riegel <juergen.riegel@web.de>             *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshAlgos.cpp b/src/Mod/MeshPart/App/MeshAlgos.cpp
index bb52be4a88..d68909579b 100644
--- a/src/Mod/MeshPart/App/MeshAlgos.cpp
+++ b/src/Mod/MeshPart/App/MeshAlgos.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Juergen Riegel <juergen.riegel@web.de>             *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshAlgos.h b/src/Mod/MeshPart/App/MeshAlgos.h
index cca7065c9a..c0b9a6c56c 100644
--- a/src/Mod/MeshPart/App/MeshAlgos.h
+++ b/src/Mod/MeshPart/App/MeshAlgos.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Juergen Riegel <juergen.riegel@web.de>             *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshFlattening.cpp b/src/Mod/MeshPart/App/MeshFlattening.cpp
index d6d2bafe08..6ddd0cf24d 100644
--- a/src/Mod/MeshPart/App/MeshFlattening.cpp
+++ b/src/Mod/MeshPart/App/MeshFlattening.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Lorenz Lechner                                     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshFlattening.h b/src/Mod/MeshPart/App/MeshFlattening.h
index 8b99d467e1..9ac97fdac4 100644
--- a/src/Mod/MeshPart/App/MeshFlattening.h
+++ b/src/Mod/MeshPart/App/MeshFlattening.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Lorenz Lechner                                     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.cpp b/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.cpp
index 5ed70956e4..27655ec375 100644
--- a/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.cpp
+++ b/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Lorenz Lechner                                     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.h b/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.h
index 27d9abbf28..d4efea1344 100644
--- a/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.h
+++ b/src/Mod/MeshPart/App/MeshFlatteningLscmRelax.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Lorenz Lechner                                     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshFlatteningNurbs.cpp b/src/Mod/MeshPart/App/MeshFlatteningNurbs.cpp
index 588d9ebf9d..092360fd6d 100644
--- a/src/Mod/MeshPart/App/MeshFlatteningNurbs.cpp
+++ b/src/Mod/MeshPart/App/MeshFlatteningNurbs.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Lorenz Lechner                                     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshFlatteningNurbs.h b/src/Mod/MeshPart/App/MeshFlatteningNurbs.h
index 7a963a87a5..35013320f0 100644
--- a/src/Mod/MeshPart/App/MeshFlatteningNurbs.h
+++ b/src/Mod/MeshPart/App/MeshFlatteningNurbs.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Lorenz Lechner                                     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/MeshFlatteningPy.cpp b/src/Mod/MeshPart/App/MeshFlatteningPy.cpp
index 37d38a7144..558310a789 100644
--- a/src/Mod/MeshPart/App/MeshFlatteningPy.cpp
+++ b/src/Mod/MeshPart/App/MeshFlatteningPy.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Lorenz Lechner                                     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/Mesher.cpp b/src/Mod/MeshPart/App/Mesher.cpp
index 580d286257..be7d98723f 100644
--- a/src/Mod/MeshPart/App/Mesher.cpp
+++ b/src/Mod/MeshPart/App/Mesher.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2010 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/Mesher.h b/src/Mod/MeshPart/App/Mesher.h
index 7297e92057..0bcd700336 100644
--- a/src/Mod/MeshPart/App/Mesher.h
+++ b/src/Mod/MeshPart/App/Mesher.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2010 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/App/PreCompiled.h b/src/Mod/MeshPart/App/PreCompiled.h
index 64dbeb96c4..fc4d0a8448 100644
--- a/src/Mod/MeshPart/App/PreCompiled.h
+++ b/src/Mod/MeshPart/App/PreCompiled.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/MeshPart/CMakeLists.txt b/src/Mod/MeshPart/CMakeLists.txt
index 60e74bf071..8d67df2120 100644
--- a/src/Mod/MeshPart/CMakeLists.txt
+++ b/src/Mod/MeshPart/CMakeLists.txt
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
 
 add_subdirectory(App)
 if(BUILD_GUI)
diff --git a/src/Mod/MeshPart/Gui/AppMeshPartGui.cpp b/src/Mod/MeshPart/Gui/AppMeshPartGui.cpp
index b7183ba179..83bc4ff72b 100644
--- a/src/Mod/MeshPart/Gui/AppMeshPartGui.cpp
+++ b/src/Mod/MeshPart/Gui/AppMeshPartGui.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/CMakeLists.txt b/src/Mod/MeshPart/Gui/CMakeLists.txt
index ae66abdb1a..11519f927f 100644
--- a/src/Mod/MeshPart/Gui/CMakeLists.txt
+++ b/src/Mod/MeshPart/Gui/CMakeLists.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 if (SMESH_FOUND)
     add_definitions(-DHAVE_SMESH)
     if(SMESH_VERSION_MAJOR LESS_EQUAL 9 AND SMESH_VERSION_MINOR LESS 10 )
diff --git a/src/Mod/MeshPart/Gui/Command.cpp b/src/Mod/MeshPart/Gui/Command.cpp
index d65ff92330..a2dce3fd6e 100644
--- a/src/Mod/MeshPart/Gui/Command.cpp
+++ b/src/Mod/MeshPart/Gui/Command.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/CrossSections.cpp b/src/Mod/MeshPart/Gui/CrossSections.cpp
index e2643fd457..232ab65635 100644
--- a/src/Mod/MeshPart/Gui/CrossSections.cpp
+++ b/src/Mod/MeshPart/Gui/CrossSections.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2019 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/CrossSections.h b/src/Mod/MeshPart/Gui/CrossSections.h
index 502e3304c1..9fe695a8ad 100644
--- a/src/Mod/MeshPart/Gui/CrossSections.h
+++ b/src/Mod/MeshPart/Gui/CrossSections.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2019 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/CurveOnMesh.cpp b/src/Mod/MeshPart/Gui/CurveOnMesh.cpp
index c4f8a1a21d..510e438635 100644
--- a/src/Mod/MeshPart/Gui/CurveOnMesh.cpp
+++ b/src/Mod/MeshPart/Gui/CurveOnMesh.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/CurveOnMesh.h b/src/Mod/MeshPart/Gui/CurveOnMesh.h
index 1daa9a1063..f33d4dcd65 100644
--- a/src/Mod/MeshPart/Gui/CurveOnMesh.h
+++ b/src/Mod/MeshPart/Gui/CurveOnMesh.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/MeshFlatteningCommand.py b/src/Mod/MeshPart/Gui/MeshFlatteningCommand.py
index 0c4c100e2c..46d1e14b2b 100644
--- a/src/Mod/MeshPart/Gui/MeshFlatteningCommand.py
+++ b/src/Mod/MeshPart/Gui/MeshFlatteningCommand.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 # ***************************************************************************
 # *   Copyright (c) 2017 Lorenz Lechner                                     *
 # *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/PreCompiled.h b/src/Mod/MeshPart/Gui/PreCompiled.h
index 725de73281..cfe8193ddc 100644
--- a/src/Mod/MeshPart/Gui/PreCompiled.h
+++ b/src/Mod/MeshPart/Gui/PreCompiled.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/TaskCurveOnMesh.cpp b/src/Mod/MeshPart/Gui/TaskCurveOnMesh.cpp
index f355d66aa0..e63726bb3f 100644
--- a/src/Mod/MeshPart/Gui/TaskCurveOnMesh.cpp
+++ b/src/Mod/MeshPart/Gui/TaskCurveOnMesh.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/TaskCurveOnMesh.h b/src/Mod/MeshPart/Gui/TaskCurveOnMesh.h
index 84e3788594..6fe65675b4 100644
--- a/src/Mod/MeshPart/Gui/TaskCurveOnMesh.h
+++ b/src/Mod/MeshPart/Gui/TaskCurveOnMesh.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2017 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/Tessellation.cpp b/src/Mod/MeshPart/Gui/Tessellation.cpp
index 5e34210412..f59dd67bb3 100644
--- a/src/Mod/MeshPart/Gui/Tessellation.cpp
+++ b/src/Mod/MeshPart/Gui/Tessellation.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2010 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/Tessellation.h b/src/Mod/MeshPart/Gui/Tessellation.h
index 77d17d059d..d4b8f8fe87 100644
--- a/src/Mod/MeshPart/Gui/Tessellation.h
+++ b/src/Mod/MeshPart/Gui/Tessellation.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2010 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/Workbench.cpp b/src/Mod/MeshPart/Gui/Workbench.cpp
index 0fbff9391a..5388e6eca5 100644
--- a/src/Mod/MeshPart/Gui/Workbench.cpp
+++ b/src/Mod/MeshPart/Gui/Workbench.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Gui/Workbench.h b/src/Mod/MeshPart/Gui/Workbench.h
index 7d586719fa..911152b21d 100644
--- a/src/Mod/MeshPart/Gui/Workbench.h
+++ b/src/Mod/MeshPart/Gui/Workbench.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2008 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/MeshPart/Init.py b/src/Mod/MeshPart/Init.py
index d6eb27fe80..e88cb975eb 100644
--- a/src/Mod/MeshPart/Init.py
+++ b/src/Mod/MeshPart/Init.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 # FreeCAD init script of the MeshPart module
 # (c) 2001 Juergen Riegel
 
diff --git a/src/Mod/MeshPart/InitGui.py b/src/Mod/MeshPart/InitGui.py
index 38cee8a100..1f75a2c4c7 100644
--- a/src/Mod/MeshPart/InitGui.py
+++ b/src/Mod/MeshPart/InitGui.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 # MeshPart gui init module
 # (c) 2003 Juergen Riegel
 #
diff --git a/src/Mod/MeshPart/MeshPartGlobal.h b/src/Mod/MeshPart/MeshPartGlobal.h
index 1e4d3b22ca..de27c26890 100644
--- a/src/Mod/MeshPart/MeshPartGlobal.h
+++ b/src/Mod/MeshPart/MeshPartGlobal.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2021 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *