diff --git a/documentation/adt-manual/adt-command.xml b/documentation/adt-manual/adt-command.xml
index c78d18a16d..b88c0ac682 100644
--- a/documentation/adt-manual/adt-command.xml
+++ b/documentation/adt-manual/adt-command.xml
@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='using-the-command-line'>
 <title>Using the Command Line</title>
diff --git a/documentation/adt-manual/adt-intro.xml b/documentation/adt-manual/adt-intro.xml
index 597c7120ba..eb75763db3 100644
--- a/documentation/adt-manual/adt-intro.xml
+++ b/documentation/adt-manual/adt-intro.xml
@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='adt-intro'>
     <title>The Application Development Toolkit (ADT)</title>
diff --git a/documentation/adt-manual/adt-manual-customization.xsl b/documentation/adt-manual/adt-manual-customization.xsl
index b86be519b9..551f7e9e94 100644
--- a/documentation/adt-manual/adt-manual-customization.xsl
+++ b/documentation/adt-manual/adt-manual-customization.xsl
@@ -1,4 +1,5 @@
 <?xml version='1.0'?>
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0">
 
   <xsl:import href="http://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-xsl-1.76.1/xhtml/docbook.xsl" />
diff --git a/documentation/adt-manual/adt-manual-eclipse-customization.xsl b/documentation/adt-manual/adt-manual-eclipse-customization.xsl
index 77ba5f5719..3d536d5473 100644
--- a/documentation/adt-manual/adt-manual-eclipse-customization.xsl
+++ b/documentation/adt-manual/adt-manual-eclipse-customization.xsl
@@ -1,4 +1,6 @@
 <?xml version='1.0'?>
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
+
 <xsl:stylesheet
 	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 	xmlns="http://www.w3.org/1999/xhtml"
diff --git a/documentation/adt-manual/adt-manual-intro.xml b/documentation/adt-manual/adt-manual-intro.xml
index 034fdff609..b7a25a54bd 100644
--- a/documentation/adt-manual/adt-manual-intro.xml
+++ b/documentation/adt-manual/adt-manual-intro.xml
@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='adt-manual-intro'>
 <title>Introduction</title>
diff --git a/documentation/adt-manual/adt-manual.xml b/documentation/adt-manual/adt-manual.xml
index 972f8bf086..13202cc0de 100644
--- a/documentation/adt-manual/adt-manual.xml
+++ b/documentation/adt-manual/adt-manual.xml
@@ -1,6 +1,7 @@
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <book id='adt-manual' lang='en'
       xmlns:xi="http://www.w3.org/2003/XInclude"
diff --git a/documentation/adt-manual/adt-package.xml b/documentation/adt-manual/adt-package.xml
index 68eee9b389..eaed0447b6 100644
--- a/documentation/adt-manual/adt-package.xml
+++ b/documentation/adt-manual/adt-package.xml
@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='adt-package'>
 <title>Optionally Customizing the Development Packages Installation</title>
diff --git a/documentation/adt-manual/adt-prepare.xml b/documentation/adt-manual/adt-prepare.xml
index 65df1d03e6..684eb75c56 100644
--- a/documentation/adt-manual/adt-prepare.xml
+++ b/documentation/adt-manual/adt-prepare.xml
@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='adt-prepare'>
 
diff --git a/documentation/adt-manual/adt-style.css b/documentation/adt-manual/adt-style.css
index d722ad4b7f..9d6221ae51 100644
--- a/documentation/adt-manual/adt-style.css
+++ b/documentation/adt-manual/adt-style.css
@@ -1,4 +1,6 @@
 /*
+   SPDX-License-Identifier: CC-BY-2.0-UK
+
    Generic XHTML / DocBook XHTML CSS Stylesheet.
 
    Browser wrangling and typographic design by