diff --git a/documentation/sdk-manual/sdk-appendix-customizing-standard.xml b/documentation/sdk-manual/sdk-appendix-customizing-standard.xml
index f20891c80d..3a6b4c8d82 100644
--- a/documentation/sdk-manual/sdk-appendix-customizing-standard.xml
+++ b/documentation/sdk-manual/sdk-appendix-customizing-standard.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-->
 
 <appendix id='sdk-appendix-customizing-standard'>
 
diff --git a/documentation/sdk-manual/sdk-appendix-customizing.xml b/documentation/sdk-manual/sdk-appendix-customizing.xml
index 911658f914..08054f8b79 100644
--- a/documentation/sdk-manual/sdk-appendix-customizing.xml
+++ b/documentation/sdk-manual/sdk-appendix-customizing.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-->
 
 <appendix id='sdk-appendix-customizing'>
 
diff --git a/documentation/sdk-manual/sdk-appendix-obtain.xml b/documentation/sdk-manual/sdk-appendix-obtain.xml
index 86b6d7dd07..de7f75e2bb 100644
--- a/documentation/sdk-manual/sdk-appendix-obtain.xml
+++ b/documentation/sdk-manual/sdk-appendix-obtain.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-->
 
 <appendix id='sdk-appendix-obtain'>
 
diff --git a/documentation/sdk-manual/sdk-extensible.xml b/documentation/sdk-manual/sdk-extensible.xml
index 94d2a241fe..a73a07a7b9 100644
--- a/documentation/sdk-manual/sdk-extensible.xml
+++ b/documentation/sdk-manual/sdk-extensible.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='sdk-extensible'>
 
diff --git a/documentation/sdk-manual/sdk-intro.xml b/documentation/sdk-manual/sdk-intro.xml
index 9169fe9c05..f42670ea6e 100644
--- a/documentation/sdk-manual/sdk-intro.xml
+++ b/documentation/sdk-manual/sdk-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='sdk-intro'>
 <title>Introduction</title>
diff --git a/documentation/sdk-manual/sdk-manual-customization.xsl b/documentation/sdk-manual/sdk-manual-customization.xsl
index efa8a84bbb..4f8816f950 100644
--- a/documentation/sdk-manual/sdk-manual-customization.xsl
+++ b/documentation/sdk-manual/sdk-manual-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" 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/sdk-manual/sdk-manual.xml b/documentation/sdk-manual/sdk-manual.xml
index 537663dade..6344478fb0 100755
--- a/documentation/sdk-manual/sdk-manual.xml
+++ b/documentation/sdk-manual/sdk-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='sdk-manual' lang='en'
       xmlns:xi="http://www.w3.org/2003/XInclude"
diff --git a/documentation/sdk-manual/sdk-style.css b/documentation/sdk-manual/sdk-style.css
index 52518964ca..e0c4416a15 100644
--- a/documentation/sdk-manual/sdk-style.css
+++ b/documentation/sdk-manual/sdk-style.css
@@ -1,4 +1,7 @@
 /*
+
+   SPDX-License-Identifier: CC-BY-2.0-UK
+
    Generic XHTML / DocBook XHTML CSS Stylesheet.
 
    Browser wrangling and typographic design by
diff --git a/documentation/sdk-manual/sdk-using.xml b/documentation/sdk-manual/sdk-using.xml
index 66b15cd6ce..28ee50d0b7 100644
--- a/documentation/sdk-manual/sdk-using.xml
+++ b/documentation/sdk-manual/sdk-using.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='sdk-using-the-standard-sdk'>
     <title>Using the Standard SDK</title>
diff --git a/documentation/sdk-manual/sdk-working-projects.xml b/documentation/sdk-manual/sdk-working-projects.xml
index 521271d54c..070d903c73 100644
--- a/documentation/sdk-manual/sdk-working-projects.xml
+++ b/documentation/sdk-manual/sdk-working-projects.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='sdk-working-projects'>