diff --git a/src/Mod/Spreadsheet/App/AppSpreadsheet.cpp b/src/Mod/Spreadsheet/App/AppSpreadsheet.cpp
index 0b11145c78..15342362c3 100644
--- a/src/Mod/Spreadsheet/App/AppSpreadsheet.cpp
+++ b/src/Mod/Spreadsheet/App/AppSpreadsheet.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2002 Juergen Riegel <juergen.riegel@web.de>             *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/App/CMakeLists.txt b/src/Mod/Spreadsheet/App/CMakeLists.txt
index f230be3e19..d486a5d1ec 100644
--- a/src/Mod/Spreadsheet/App/CMakeLists.txt
+++ b/src/Mod/Spreadsheet/App/CMakeLists.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 if(WIN32)
     add_definitions(-DFCAppSpreadsheet)
 endif(WIN32)
diff --git a/src/Mod/Spreadsheet/App/Cell.cpp b/src/Mod/Spreadsheet/App/Cell.cpp
index f58fc9ccfe..15f5a325d0 100644
--- a/src/Mod/Spreadsheet/App/Cell.cpp
+++ b/src/Mod/Spreadsheet/App/Cell.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/Cell.h b/src/Mod/Spreadsheet/App/Cell.h
index 5c7710136d..05d082e9d4 100644
--- a/src/Mod/Spreadsheet/App/Cell.h
+++ b/src/Mod/Spreadsheet/App/Cell.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/DisplayUnit.h b/src/Mod/Spreadsheet/App/DisplayUnit.h
index d698f93deb..9440ee7d22 100644
--- a/src/Mod/Spreadsheet/App/DisplayUnit.h
+++ b/src/Mod/Spreadsheet/App/DisplayUnit.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PreCompiled.h b/src/Mod/Spreadsheet/App/PreCompiled.h
index a440f0d594..02547f212b 100644
--- a/src/Mod/Spreadsheet/App/PreCompiled.h
+++ b/src/Mod/Spreadsheet/App/PreCompiled.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2002 Jürgen Riegel <juergen.riegel@web.de>              *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/App/PropertyColumnWidths.cpp b/src/Mod/Spreadsheet/App/PropertyColumnWidths.cpp
index c81e70032c..85e8043efe 100644
--- a/src/Mod/Spreadsheet/App/PropertyColumnWidths.cpp
+++ b/src/Mod/Spreadsheet/App/PropertyColumnWidths.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertyColumnWidths.h b/src/Mod/Spreadsheet/App/PropertyColumnWidths.h
index 33591f4b34..bfc8f96278 100644
--- a/src/Mod/Spreadsheet/App/PropertyColumnWidths.h
+++ b/src/Mod/Spreadsheet/App/PropertyColumnWidths.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertyColumnWidthsPyImp.cpp b/src/Mod/Spreadsheet/App/PropertyColumnWidthsPyImp.cpp
index 99d5ddd734..cdf389b1f0 100644
--- a/src/Mod/Spreadsheet/App/PropertyColumnWidthsPyImp.cpp
+++ b/src/Mod/Spreadsheet/App/PropertyColumnWidthsPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertyRowHeights.cpp b/src/Mod/Spreadsheet/App/PropertyRowHeights.cpp
index 5f7a2962c3..02e3d03a31 100644
--- a/src/Mod/Spreadsheet/App/PropertyRowHeights.cpp
+++ b/src/Mod/Spreadsheet/App/PropertyRowHeights.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertyRowHeights.h b/src/Mod/Spreadsheet/App/PropertyRowHeights.h
index d5eb026006..5d5c8e954e 100644
--- a/src/Mod/Spreadsheet/App/PropertyRowHeights.h
+++ b/src/Mod/Spreadsheet/App/PropertyRowHeights.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertyRowHeightsPyImp.cpp b/src/Mod/Spreadsheet/App/PropertyRowHeightsPyImp.cpp
index ecc2cfccfd..4f167c0d5b 100644
--- a/src/Mod/Spreadsheet/App/PropertyRowHeightsPyImp.cpp
+++ b/src/Mod/Spreadsheet/App/PropertyRowHeightsPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertySheet.cpp b/src/Mod/Spreadsheet/App/PropertySheet.cpp
index 5f386add40..c92ab35ba0 100644
--- a/src/Mod/Spreadsheet/App/PropertySheet.cpp
+++ b/src/Mod/Spreadsheet/App/PropertySheet.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertySheet.h b/src/Mod/Spreadsheet/App/PropertySheet.h
index 5268036eb1..4c7ff198a4 100644
--- a/src/Mod/Spreadsheet/App/PropertySheet.h
+++ b/src/Mod/Spreadsheet/App/PropertySheet.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/PropertySheetPyImp.cpp b/src/Mod/Spreadsheet/App/PropertySheetPyImp.cpp
index b785774fd3..91281b3e5a 100644
--- a/src/Mod/Spreadsheet/App/PropertySheetPyImp.cpp
+++ b/src/Mod/Spreadsheet/App/PropertySheetPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/Sheet.cpp b/src/Mod/Spreadsheet/App/Sheet.cpp
index fb21b12819..8254873b0d 100644
--- a/src/Mod/Spreadsheet/App/Sheet.cpp
+++ b/src/Mod/Spreadsheet/App/Sheet.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/Sheet.h b/src/Mod/Spreadsheet/App/Sheet.h
index 4bfdeb3edc..c4d57a4b48 100644
--- a/src/Mod/Spreadsheet/App/Sheet.h
+++ b/src/Mod/Spreadsheet/App/Sheet.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/SheetObserver.cpp b/src/Mod/Spreadsheet/App/SheetObserver.cpp
index 45ff751cab..b8de033ba4 100644
--- a/src/Mod/Spreadsheet/App/SheetObserver.cpp
+++ b/src/Mod/Spreadsheet/App/SheetObserver.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/SheetObserver.h b/src/Mod/Spreadsheet/App/SheetObserver.h
index c4d4122f18..9dce56aa74 100644
--- a/src/Mod/Spreadsheet/App/SheetObserver.h
+++ b/src/Mod/Spreadsheet/App/SheetObserver.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/SheetPyImp.cpp b/src/Mod/Spreadsheet/App/SheetPyImp.cpp
index 221bd9557a..eb8acb99ee 100644
--- a/src/Mod/Spreadsheet/App/SheetPyImp.cpp
+++ b/src/Mod/Spreadsheet/App/SheetPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2010 Jürgen Riegel <juergen.riegel@web.de>              *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/App/Spreadsheet.FCMacro b/src/Mod/Spreadsheet/App/Spreadsheet.FCMacro
index b545e78026..3bdacde961 100644
--- a/src/Mod/Spreadsheet/App/Spreadsheet.FCMacro
+++ b/src/Mod/Spreadsheet/App/Spreadsheet.FCMacro
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 import string
 
 row = 2
diff --git a/src/Mod/Spreadsheet/App/Utils.cpp b/src/Mod/Spreadsheet/App/Utils.cpp
index 5d0a1d8573..61ee9329bf 100644
--- a/src/Mod/Spreadsheet/App/Utils.cpp
+++ b/src/Mod/Spreadsheet/App/Utils.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/Utils.h b/src/Mod/Spreadsheet/App/Utils.h
index ae5bbfe1af..39d5ba57af 100644
--- a/src/Mod/Spreadsheet/App/Utils.h
+++ b/src/Mod/Spreadsheet/App/Utils.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/App/create_regexps.sh b/src/Mod/Spreadsheet/App/create_regexps.sh
index ca5390852e..1dfee312e4 100755
--- a/src/Mod/Spreadsheet/App/create_regexps.sh
+++ b/src/Mod/Spreadsheet/App/create_regexps.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+# SPDX-License-Identifier: LGPL-2.1-or-later
 
 # DerivedGeneralCategory.txt used below can be downloaded from
 # http://www.unicode.org/Public/UNIDATA/extracted/DerivedGeneralCategory.txt
diff --git a/src/Mod/Spreadsheet/CMakeLists.txt b/src/Mod/Spreadsheet/CMakeLists.txt
index 212b7d316d..999d002997 100644
--- a/src/Mod/Spreadsheet/CMakeLists.txt
+++ b/src/Mod/Spreadsheet/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/Spreadsheet/Gui/AppSpreadsheetGui.cpp b/src/Mod/Spreadsheet/Gui/AppSpreadsheetGui.cpp
index 413b5e0137..f37e7911ad 100644
--- a/src/Mod/Spreadsheet/Gui/AppSpreadsheetGui.cpp
+++ b/src/Mod/Spreadsheet/Gui/AppSpreadsheetGui.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2006 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/Gui/CMakeLists.txt b/src/Mod/Spreadsheet/Gui/CMakeLists.txt
index ecc71341ce..519076097b 100644
--- a/src/Mod/Spreadsheet/Gui/CMakeLists.txt
+++ b/src/Mod/Spreadsheet/Gui/CMakeLists.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 generate_from_py(ViewProviderSpreadsheet)
 
 # The XML files
diff --git a/src/Mod/Spreadsheet/Gui/Command.cpp b/src/Mod/Spreadsheet/Gui/Command.cpp
index db3c291360..332fd64c0e 100644
--- a/src/Mod/Spreadsheet/Gui/Command.cpp
+++ b/src/Mod/Spreadsheet/Gui/Command.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2002 Jürgen Riegel <juergen.riegel@web.de>              *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/Gui/DlgBindSheet.cpp b/src/Mod/Spreadsheet/Gui/DlgBindSheet.cpp
index 3fc3119b79..0b8f1d7d6c 100644
--- a/src/Mod/Spreadsheet/Gui/DlgBindSheet.cpp
+++ b/src/Mod/Spreadsheet/Gui/DlgBindSheet.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /****************************************************************************
  *   Copyright (c) 2019 Zheng, Lei (realthunder) <realthunder.dev@gmail.com>*
  *                                                                          *
diff --git a/src/Mod/Spreadsheet/Gui/DlgBindSheet.h b/src/Mod/Spreadsheet/Gui/DlgBindSheet.h
index c70f3c59cb..043f854a56 100644
--- a/src/Mod/Spreadsheet/Gui/DlgBindSheet.h
+++ b/src/Mod/Spreadsheet/Gui/DlgBindSheet.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /****************************************************************************
  *   Copyright (c) 2019 Zheng, Lei (realthunder) <realthunder.dev@gmail.com>*
  *                                                                          *
diff --git a/src/Mod/Spreadsheet/Gui/DlgSettingsImp.cpp b/src/Mod/Spreadsheet/Gui/DlgSettingsImp.cpp
index ee85189bc9..8572a38ac5 100644
--- a/src/Mod/Spreadsheet/Gui/DlgSettingsImp.cpp
+++ b/src/Mod/Spreadsheet/Gui/DlgSettingsImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2002 Jürgen Riegel <juergen.riegel@web.de>              *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/DlgSettingsImp.h b/src/Mod/Spreadsheet/Gui/DlgSettingsImp.h
index c02cb8e46b..b4c0a47802 100644
--- a/src/Mod/Spreadsheet/Gui/DlgSettingsImp.h
+++ b/src/Mod/Spreadsheet/Gui/DlgSettingsImp.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2021 Mark Ganson <TheMarkster>                          *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/DlgSheetConf.cpp b/src/Mod/Spreadsheet/Gui/DlgSheetConf.cpp
index 6537eb729c..2f1be9f1ad 100644
--- a/src/Mod/Spreadsheet/Gui/DlgSheetConf.cpp
+++ b/src/Mod/Spreadsheet/Gui/DlgSheetConf.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /****************************************************************************
  *   Copyright (c) 2019 Zheng, Lei (realthunder) <realthunder.dev@gmail.com>*
  *                                                                          *
diff --git a/src/Mod/Spreadsheet/Gui/DlgSheetConf.h b/src/Mod/Spreadsheet/Gui/DlgSheetConf.h
index fda5a4f550..f8aa1775d0 100644
--- a/src/Mod/Spreadsheet/Gui/DlgSheetConf.h
+++ b/src/Mod/Spreadsheet/Gui/DlgSheetConf.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /****************************************************************************
  *   Copyright (c) 2019 Zheng, Lei (realthunder) <realthunder.dev@gmail.com>*
  *                                                                          *
diff --git a/src/Mod/Spreadsheet/Gui/LineEdit.cpp b/src/Mod/Spreadsheet/Gui/LineEdit.cpp
index bf06632ce7..ecd1145798 100644
--- a/src/Mod/Spreadsheet/Gui/LineEdit.cpp
+++ b/src/Mod/Spreadsheet/Gui/LineEdit.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/LineEdit.h b/src/Mod/Spreadsheet/Gui/LineEdit.h
index 9255b9334c..c1dcbff04a 100644
--- a/src/Mod/Spreadsheet/Gui/LineEdit.h
+++ b/src/Mod/Spreadsheet/Gui/LineEdit.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/PreCompiled.h b/src/Mod/Spreadsheet/Gui/PreCompiled.h
index 6d08c5ef6a..d2d60e7f67 100644
--- a/src/Mod/Spreadsheet/Gui/PreCompiled.h
+++ b/src/Mod/Spreadsheet/Gui/PreCompiled.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2002 Jürgen Riegel <juergen.riegel@web.de>              *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/Gui/PropertiesDialog.cpp b/src/Mod/Spreadsheet/Gui/PropertiesDialog.cpp
index ae8feab3d7..9c5c32a3c4 100644
--- a/src/Mod/Spreadsheet/Gui/PropertiesDialog.cpp
+++ b/src/Mod/Spreadsheet/Gui/PropertiesDialog.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/PropertiesDialog.h b/src/Mod/Spreadsheet/Gui/PropertiesDialog.h
index e44ab7e61a..cf1f4c877d 100644
--- a/src/Mod/Spreadsheet/Gui/PropertiesDialog.h
+++ b/src/Mod/Spreadsheet/Gui/PropertiesDialog.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SheetModel.cpp b/src/Mod/Spreadsheet/Gui/SheetModel.cpp
index 7f28e345a6..bb51bf4a72 100644
--- a/src/Mod/Spreadsheet/Gui/SheetModel.cpp
+++ b/src/Mod/Spreadsheet/Gui/SheetModel.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SheetModel.h b/src/Mod/Spreadsheet/Gui/SheetModel.h
index c42e254dcf..fae115e69d 100644
--- a/src/Mod/Spreadsheet/Gui/SheetModel.h
+++ b/src/Mod/Spreadsheet/Gui/SheetModel.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SheetTableView.cpp b/src/Mod/Spreadsheet/Gui/SheetTableView.cpp
index 86a7caee02..7fd2ab34b7 100644
--- a/src/Mod/Spreadsheet/Gui/SheetTableView.cpp
+++ b/src/Mod/Spreadsheet/Gui/SheetTableView.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SheetTableView.h b/src/Mod/Spreadsheet/Gui/SheetTableView.h
index 2c5bf81307..913f71c05a 100644
--- a/src/Mod/Spreadsheet/Gui/SheetTableView.h
+++ b/src/Mod/Spreadsheet/Gui/SheetTableView.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.cpp b/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.cpp
index 162edfbd24..86d1e01bee 100644
--- a/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.cpp
+++ b/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2023 Adrian Popescu                                     *
  *   <adrian-constantin.popescu@outlook.com>                               *
diff --git a/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.h b/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.h
index c8eb94c03f..76ffa7ff02 100644
--- a/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.h
+++ b/src/Mod/Spreadsheet/Gui/SheetTableViewAccessibleInterface.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2023 Adrian Popescu                                     *
  *   <adrian-constantin.popescu@outlook.com>                               *
diff --git a/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.cpp b/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.cpp
index 52f47496b9..956963fd70 100644
--- a/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.cpp
+++ b/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen (eivind@kvedalen.name)             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.h b/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.h
index 7ae2fe0338..ac4810c0a7 100644
--- a/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.h
+++ b/src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2015 Eivind Kvedalen (eivind@kvedalen.name)             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SpreadsheetView.cpp b/src/Mod/Spreadsheet/Gui/SpreadsheetView.cpp
index 7e37cf17c3..1bba9f814b 100644
--- a/src/Mod/Spreadsheet/Gui/SpreadsheetView.cpp
+++ b/src/Mod/Spreadsheet/Gui/SpreadsheetView.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) Eivind Kvedalen (eivind@kvedalen.name) 2015-2016        *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/SpreadsheetView.h b/src/Mod/Spreadsheet/Gui/SpreadsheetView.h
index 82b720c103..431b5e0b4d 100644
--- a/src/Mod/Spreadsheet/Gui/SpreadsheetView.h
+++ b/src/Mod/Spreadsheet/Gui/SpreadsheetView.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) Eivind Kvedalen (eivind@kvedalen.name) 2015             *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.cpp b/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.cpp
index 41b44720d6..5608c649a8 100644
--- a/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.cpp
+++ b/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2011 Juergen Riegel <juergen.riegel@web.de>             *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.h b/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.h
index 9bf1459dd1..3b57e04b1b 100644
--- a/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.h
+++ b/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2011 Juergen Riegel <juergen.riegel@web.de>             *
  *   Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheetPyImp.cpp b/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheetPyImp.cpp
index a78451d766..966985f507 100644
--- a/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheetPyImp.cpp
+++ b/src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheetPyImp.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2021 Jose Luis Cercos-Pita                              *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/Gui/Workbench.cpp b/src/Mod/Spreadsheet/Gui/Workbench.cpp
index 36bf4f8e1d..db201148e1 100644
--- a/src/Mod/Spreadsheet/Gui/Workbench.cpp
+++ b/src/Mod/Spreadsheet/Gui/Workbench.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2005 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *   Copyright (c) 2015 Eivind Kvedalen (eivind@kvedalen.name)             *
diff --git a/src/Mod/Spreadsheet/Gui/Workbench.h b/src/Mod/Spreadsheet/Gui/Workbench.h
index b7942ad8e6..c1ac808dd1 100644
--- a/src/Mod/Spreadsheet/Gui/Workbench.h
+++ b/src/Mod/Spreadsheet/Gui/Workbench.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2005 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *   Copyright (c) 2015 Eivind Kvedalen (eivind@kvedalen.name)             *
diff --git a/src/Mod/Spreadsheet/Gui/qtcolorpicker.cpp b/src/Mod/Spreadsheet/Gui/qtcolorpicker.cpp
index 673d43a00c..bff5423135 100644
--- a/src/Mod/Spreadsheet/Gui/qtcolorpicker.cpp
+++ b/src/Mod/Spreadsheet/Gui/qtcolorpicker.cpp
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-only OR GPL-3.0-only
+
 /****************************************************************************
 **
 ** This file is part of a Qt Solutions component.
diff --git a/src/Mod/Spreadsheet/Gui/qtcolorpicker.h b/src/Mod/Spreadsheet/Gui/qtcolorpicker.h
index 34af87ddf6..96aaed0d4f 100644
--- a/src/Mod/Spreadsheet/Gui/qtcolorpicker.h
+++ b/src/Mod/Spreadsheet/Gui/qtcolorpicker.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-only OR GPL-3.0-only
+
 /****************************************************************************
 **
 ** This file is part of a Qt Solutions component.
diff --git a/src/Mod/Spreadsheet/Init.py b/src/Mod/Spreadsheet/Init.py
index ad022e7b86..4d96ee2e5c 100644
--- a/src/Mod/Spreadsheet/Init.py
+++ b/src/Mod/Spreadsheet/Init.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 # ***************************************************************************
 # *   Copyright (c) 2001,2002 Juergen Riegel <juergen.riegel@web.de>        *
 # *   Copyright (c) 2013 Yorik van Havre <yorik@uncreated.net>              *
diff --git a/src/Mod/Spreadsheet/InitGui.py b/src/Mod/Spreadsheet/InitGui.py
index 034d9c2737..d8c7e566b1 100644
--- a/src/Mod/Spreadsheet/InitGui.py
+++ b/src/Mod/Spreadsheet/InitGui.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 # ***************************************************************************
 # *   Copyright (c) 2002,2003 Juergen Riegel <juergen.riegel@web.de>        *
 # *   Copyright (c) 2013 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/SpreadsheetGlobal.h b/src/Mod/Spreadsheet/SpreadsheetGlobal.h
index 0182ac0c48..9ea7cfa3a8 100644
--- a/src/Mod/Spreadsheet/SpreadsheetGlobal.h
+++ b/src/Mod/Spreadsheet/SpreadsheetGlobal.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 /***************************************************************************
  *   Copyright (c) 2021 Werner Mayer <wmayer[at]users.sourceforge.net>     *
  *                                                                         *
diff --git a/src/Mod/Spreadsheet/TestSpreadsheet.py b/src/Mod/Spreadsheet/TestSpreadsheet.py
index cd52dfcb8f..70c468b38f 100644
--- a/src/Mod/Spreadsheet/TestSpreadsheet.py
+++ b/src/Mod/Spreadsheet/TestSpreadsheet.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 # ***************************************************************************
 # *   Copyright (c) 2016 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 # *   Copyright (c) 2016 Eivind Kvedalen <eivind@kvedalen.name>             *
diff --git a/src/Mod/Spreadsheet/TestSpreadsheetGui.py b/src/Mod/Spreadsheet/TestSpreadsheetGui.py
index 156c031205..55d9d96630 100644
--- a/src/Mod/Spreadsheet/TestSpreadsheetGui.py
+++ b/src/Mod/Spreadsheet/TestSpreadsheetGui.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 # ***************************************************************************
 # *   Copyright (c) 2021 Chris Hennes <chennes@pioneerlibrarysystem.org>    *
 # *                                                                         *
diff --git a/src/Mod/Spreadsheet/importXLSX.py b/src/Mod/Spreadsheet/importXLSX.py
index ce3072a5f2..c29d28f668 100644
--- a/src/Mod/Spreadsheet/importXLSX.py
+++ b/src/Mod/Spreadsheet/importXLSX.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 # ***************************************************************************
 # *   Copyright (c) 2016 Ulrich Brammer <ulrich1a@users.sourceforge.net>    *
 # *                                                                         *
diff --git a/src/Mod/Spreadsheet/test_importXLSX.py b/src/Mod/Spreadsheet/test_importXLSX.py
index 2b4d2ac7af..15a53ec708 100644
--- a/src/Mod/Spreadsheet/test_importXLSX.py
+++ b/src/Mod/Spreadsheet/test_importXLSX.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 import unittest
 from unittest.mock import patch, MagicMock