diff --git a/src/Mod/Assembly/App/BomGroupPyImp.cpp b/src/Mod/Assembly/App/BomGroupPyImp.cpp
index 4c22736390..8bb32df084 100644
--- a/src/Mod/Assembly/App/BomGroupPyImp.cpp
+++ b/src/Mod/Assembly/App/BomGroupPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2014 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/Assembly/App/BomObjectPyImp.cpp b/src/Mod/Assembly/App/BomObjectPyImp.cpp
index 4066df238f..9b3efa6066 100644
--- a/src/Mod/Assembly/App/BomObjectPyImp.cpp
+++ b/src/Mod/Assembly/App/BomObjectPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2024 Boyer Pierre-Louis <development@ondsel>            *
  *                                                                         *
diff --git a/src/Mod/Assembly/App/CMakeLists.txt b/src/Mod/Assembly/App/CMakeLists.txt
index 70c8e0f9d3..87053222f0 100644
--- a/src/Mod/Assembly/App/CMakeLists.txt
+++ b/src/Mod/Assembly/App/CMakeLists.txt
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
 
 set(Assembly_LIBS
     Part
diff --git a/src/Mod/Assembly/App/JointGroupPyImp.cpp b/src/Mod/Assembly/App/JointGroupPyImp.cpp
index 2d23645b04..54678fca9f 100644
--- a/src/Mod/Assembly/App/JointGroupPyImp.cpp
+++ b/src/Mod/Assembly/App/JointGroupPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2014 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/Assembly/App/ViewGroupPyImp.cpp b/src/Mod/Assembly/App/ViewGroupPyImp.cpp
index 5fda15ecc4..ed83f04381 100644
--- a/src/Mod/Assembly/App/ViewGroupPyImp.cpp
+++ b/src/Mod/Assembly/App/ViewGroupPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2014 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/Assembly/Assembly/__init__.py b/src/Mod/Assembly/Assembly/__init__.py
index efdb3c261e..5011c626e4 100644
--- a/src/Mod/Assembly/Assembly/__init__.py
+++ b/src/Mod/Assembly/Assembly/__init__.py
@@ -1 +1,3 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 import AssemblyApp
diff --git a/src/Mod/Assembly/AssemblyTests/__init__.py b/src/Mod/Assembly/AssemblyTests/__init__.py
index e69de29bb2..bd4fba4dfe 100644
--- a/src/Mod/Assembly/AssemblyTests/__init__.py
+++ b/src/Mod/Assembly/AssemblyTests/__init__.py
@@ -0,0 +1 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
diff --git a/src/Mod/Assembly/CMakeLists.txt b/src/Mod/Assembly/CMakeLists.txt
index 407e58744f..f79b42cb35 100644
--- a/src/Mod/Assembly/CMakeLists.txt
+++ b/src/Mod/Assembly/CMakeLists.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 if (NOT FREECAD_USE_EXTERNAL_ONDSELSOLVER)
 include_directories(
     ${CMAKE_SOURCE_DIR}/src/3rdParty/OndselSolver
diff --git a/src/Mod/Assembly/Gui/CMakeLists.txt b/src/Mod/Assembly/Gui/CMakeLists.txt
index 541a6959a9..1fd70c01b9 100644
--- a/src/Mod/Assembly/Gui/CMakeLists.txt
+++ b/src/Mod/Assembly/Gui/CMakeLists.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 
 set(AssemblyGui_LIBS
     Assembly
diff --git a/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp b/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp
index 6d3da0ae38..7fd12654ba 100644
--- a/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp
+++ b/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp
@@ -1,4 +1,5 @@
-// SPDX - License - Identifier: LGPL - 2.1 - or -later
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /****************************************************************************
  *                                                                          *
  *   Copyright (c) 2025 Pierre-Louis Boyer                                  *
diff --git a/src/Mod/Assembly/Gui/TaskAssemblyMessages.h b/src/Mod/Assembly/Gui/TaskAssemblyMessages.h
index 2ff1fc3ecf..2a2892b843 100644
--- a/src/Mod/Assembly/Gui/TaskAssemblyMessages.h
+++ b/src/Mod/Assembly/Gui/TaskAssemblyMessages.h
@@ -1,4 +1,5 @@
-// SPDX - License - Identifier: LGPL - 2.1 - or -later
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /****************************************************************************
  *                                                                          *
  *   Copyright (c) 2025 Pierre-Louis Boyer                                  *