diff --git a/.clang-format b/.clang-format
index 1dd679d..234be76 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 ---
 BasedOnStyle: GNU
 AlignConsecutiveDeclarations: true
diff --git a/Makefile.am b/Makefile.am
index f4dbff2..a73df46 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
 SUBDIRS = include src tools tests doc bash-completion
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 headers = config.h
diff --git a/bash-completion/Makefile.am b/bash-completion/Makefile.am
index 004474e..e7027ee 100644
--- a/bash-completion/Makefile.am
+++ b/bash-completion/Makefile.am
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
 #if ENABLE_BASH_COMPLETION
 EXTRA_DIST = \
 abicompat \
diff --git a/bash-completion/abicompat b/bash-completion/abicompat
index a5c87a1..d4ff950 100644
--- a/bash-completion/abicompat
+++ b/bash-completion/abicompat
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _abicompat_module()
 {
 	local cur prev OPTS
diff --git a/bash-completion/abidiff b/bash-completion/abidiff
index edd33c3..3e0ae5b 100644
--- a/bash-completion/abidiff
+++ b/bash-completion/abidiff
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _abidiff_module()
 {
 	local cur prev OPTS
diff --git a/bash-completion/abidw b/bash-completion/abidw
index 53463ae..b83bc62 100644
--- a/bash-completion/abidw
+++ b/bash-completion/abidw
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _abidw_module()
 {
 	local cur prev OPTS
diff --git a/bash-completion/abilint b/bash-completion/abilint
index 7df78d1..d34d243 100644
--- a/bash-completion/abilint
+++ b/bash-completion/abilint
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _abilint_module()
 {
 	local cur prev OPTS
diff --git a/bash-completion/abinilint b/bash-completion/abinilint
index 137b839..0c24079 100644
--- a/bash-completion/abinilint
+++ b/bash-completion/abinilint
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _abinilint_module()
 {
 	local cur prev OPTS
diff --git a/bash-completion/abipkgdiff b/bash-completion/abipkgdiff
index fc4f7cd..894798b 100644
--- a/bash-completion/abipkgdiff
+++ b/bash-completion/abipkgdiff
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _abipkgdiff_module()
 {
 	local cur prev OPTS
diff --git a/bash-completion/abisym b/bash-completion/abisym
index dff4986..25bb075 100644
--- a/bash-completion/abisym
+++ b/bash-completion/abisym
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _abisym_module()
 {
 	local cur prev OPTS
diff --git a/bash-completion/fedabipkgdiff b/bash-completion/fedabipkgdiff
index d074419..2bfa468 100644
--- a/bash-completion/fedabipkgdiff
+++ b/bash-completion/fedabipkgdiff
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 _fedabipkgdiff_module()
 {
 	local cur OPTS
diff --git a/configure.ac b/configure.ac
index 225ac38..73801aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 m4_define([version_major],   [1])
 m4_define([version_minor],   [8])
 
diff --git a/default.abignore b/default.abignore
index 4e320ba..3916f54 100644
--- a/default.abignore
+++ b/default.abignore
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
+#
 # This file contains default system-wide suppression specifications to
 # be used by Abigail tools[1] to filter out specific ABI change
 # reports when comparing the ABI of some core system binaries.
@@ -171,4 +173,4 @@
   soname_regexp = libvirt\\.so.*
 ####################################################
 # End of libvirt default suppression specifications
-####################################################
\ No newline at end of file
+####################################################
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 0794efd..840fc7c 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
 SUBDIRS = manuals
 
 EXTRA_DIST = api/libabigail.doxy website/libabigail-website.doxy
diff --git a/doc/api/libabigail.doxy b/doc/api/libabigail.doxy
index b460d26..a7cb987 100644
--- a/doc/api/libabigail.doxy
+++ b/doc/api/libabigail.doxy
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
+#
 # Doxyfile 1.8.3.1
 
 # This file describes the settings to be used by the documentation system
diff --git a/doc/manuals/Makefile.am b/doc/manuals/Makefile.am
index 5c31fa3..342faf2 100644
--- a/doc/manuals/Makefile.am
+++ b/doc/manuals/Makefile.am
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
+#
 # Makefile for Sphinx documentation
 
 EXTRA_DIST = \
diff --git a/doc/website/libabigail-website.doxy b/doc/website/libabigail-website.doxy
index 2bf9fb4..f86ff02 100644
--- a/doc/website/libabigail-website.doxy
+++ b/doc/website/libabigail-website.doxy
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 # Doxyfile 1.8.3.1
 
 # This file describes the settings to be used by the documentation system
diff --git a/include/Makefile.am b/include/Makefile.am
index b547525..e707c62 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
 pkginclude_HEADERS =	\
 abg-sptr-utils.h	\
 abg-interned-str.h	\
diff --git a/include/abg-version.h.in b/include/abg-version.h.in
index 7d828a0..5c56459 100644
--- a/include/abg-version.h.in
+++ b/include/abg-version.h.in
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
 #ifndef __ABG_VERSION_H__
 #define __ABG_VERSION_H__
 #define ABIGAIL_VERSION_MAJOR "@VERSION_MAJOR@"
diff --git a/scripts/dot_to_png.sh b/scripts/dot_to_png.sh
index 0929bdd..8125d15 100755
--- a/scripts/dot_to_png.sh
+++ b/scripts/dot_to_png.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 for i in *.gv
 do
diff --git a/scripts/dot_to_svg.sh b/scripts/dot_to_svg.sh
index 72d298e..559cc55 100755
--- a/scripts/dot_to_svg.sh
+++ b/scripts/dot_to_svg.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 for i in *.gv
 do
diff --git a/scripts/make-verbose.sh b/scripts/make-verbose.sh
index 2389279..f9bf4c8 100644
--- a/scripts/make-verbose.sh
+++ b/scripts/make-verbose.sh
@@ -1 +1,2 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 make V=1
diff --git a/scripts/svg_to_plain_svg.sh b/scripts/svg_to_plain_svg.sh
index 5ebb7a4..7e7d803 100755
--- a/scripts/svg_to_plain_svg.sh
+++ b/scripts/svg_to_plain_svg.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 for i in *.svg;
   do inkscape "$i" --export-plain-svg="${i//svg/plain.svg}"
diff --git a/scripts/svg_to_png_and_pdf.sh b/scripts/svg_to_png_and_pdf.sh
index b55515b..d9e53d5 100755
--- a/scripts/svg_to_png_and_pdf.sh
+++ b/scripts/svg_to_png_and_pdf.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 for i in *.svg;
   do inkscape "$i" --export-png="${i//svg/png}" --export-pdf="${i//svg/pdf}"
diff --git a/src/Makefile.am b/src/Makefile.am
index 1153a5f..73e63ce 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
 lib_LTLIBRARIES=libabigail.la
 libabigaildir=$(libdir)
 
diff --git a/tests/Makefile.am b/tests/Makefile.am
index c2d4d1d..f614f30 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
 SUBDIRS = data
 
 ZIP_ARCHIVE_TESTS =
diff --git a/tests/data/Makefile.am b/tests/data/Makefile.am
index 5da9ef9..38cbfc3 100644
--- a/tests/data/Makefile.am
+++ b/tests/data/Makefile.am
@@ -1,4 +1,4 @@
-
+## SPDX-License-Identifier: LGPL-3.0-or-later
 EXTRA_DIST = \
 test-read-write/test0.xml	\
 test-read-write/test1.xml	\
diff --git a/tests/runtestcanonicalizetypes.sh.in b/tests/runtestcanonicalizetypes.sh.in
index 1df6fe6..34753c2 100644
--- a/tests/runtestcanonicalizetypes.sh.in
+++ b/tests/runtestcanonicalizetypes.sh.in
@@ -1,4 +1,5 @@
 #!/bin/sh
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 # This program launches "abidiff $binary $binary" on multiple
 # instances of $binary.  The expect result is for the command to show
diff --git a/tests/runtestdefaultsupprs.py.in b/tests/runtestdefaultsupprs.py.in
index 13c3cd5..b8a5714 100644
--- a/tests/runtestdefaultsupprs.py.in
+++ b/tests/runtestdefaultsupprs.py.in
@@ -1,4 +1,5 @@
 #!/usr/bin/env @PYTHON@
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 '''Runs tests for the default suppression specifications of libabigail.
 
diff --git a/tests/runtestdefaultsupprspy3.sh.in b/tests/runtestdefaultsupprspy3.sh.in
index 4985206..5ef5063 100644
--- a/tests/runtestdefaultsupprspy3.sh.in
+++ b/tests/runtestdefaultsupprspy3.sh.in
@@ -1,2 +1,3 @@
 #!/bin/bash
+# SPDX-License-Identifier: LGPL-3.0-or-later
 @PYTHON3_INTERPRETER@ "@abs_top_builddir@/tests/runtestdefaultsupprs.py"
diff --git a/tests/runtestfedabipkgdiffpy3.sh.in b/tests/runtestfedabipkgdiffpy3.sh.in
index 209037c..5a41d50 100644
--- a/tests/runtestfedabipkgdiffpy3.sh.in
+++ b/tests/runtestfedabipkgdiffpy3.sh.in
@@ -1,4 +1,5 @@
 #!/bin/bash -e
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 # Either tests runner script or the tools/fedabipkgdiff has shebang
 # `/usr/bin/env python`, as a result, to run tests in Python 3, we have to
diff --git a/tests/update-test-output.py b/tests/update-test-output.py
index 4017dd0..e582fb8 100755
--- a/tests/update-test-output.py
+++ b/tests/update-test-output.py
@@ -1,4 +1,5 @@
 #!/bin/python
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 # This program generates the copy commands you should use to update
 # the reference data for tests <build-dir>/tests/runtest* that emit an
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 6f949af..937117d 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: LGPL-3.0-or-later
 h=$(abs_srcdir)
 
 if ENABLE_ZIP_ARCHIVE
diff --git a/update-copyright.sh b/update-copyright.sh
index 9192aff..3936cd8 100644
--- a/update-copyright.sh
+++ b/update-copyright.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+# SPDX-License-Identifier: LGPL-3.0-or-later
 
 oldyear=2019
 newyear=2020
