diff --git a/README.qmd b/README.qmd
index 21e08f70b1c2dfb49be444e8df5dad6df30f8a11..b803b0125e85fde9224ee9b9bda879a8c7c944ad 100644
--- a/README.qmd
+++ b/README.qmd
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ![CC-BY-4.0](https://i.creativecommons.org/l/by/4.0/88x31.png)
 The full documentation of this work is lecensed under a
 [Creative Commons Attribution 4.0 International License (CC BY
diff --git a/index.qmd b/index.qmd
index 194c4e400272848aa9c80528f6a9f54efe967520..31118d4a072511bcda24577c2c92abfc9bfd2665 100644
--- a/index.qmd
+++ b/index.qmd
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: "Git Borg Linker"
 ---
diff --git a/license.qmd b/license.qmd
index 507d62ea7b63bd81ff870fea5099fccd912be64e..0f826917ae026d68fa3be9925b3f54c9fd69bc65 100644
--- a/license.qmd
+++ b/license.qmd
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: "AGPL3"
 ---
diff --git a/slides/slides.qmd b/slides/slides.qmd
index a5f3841922717bea6bf475e9fb5b99999165533c..98c813a20cc5c7741ead1d0eba3eab996210a22e 100644
--- a/slides/slides.qmd
+++ b/slides/slides.qmd
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: "Git Borg Linker"
 title-slide-attributes:
diff --git a/slides/style.css b/slides/style.css
index b56dda7fde3cecf7cc81bbe68719798024d6accf..793adf4ccfc9ae6c54abfdf12e3fb11a8de01b4f 100644
--- a/slides/style.css
+++ b/slides/style.css
@@ -1,3 +1,9 @@
+/*
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+*/
+
 .reveal .slide-background.present {
     background-color: rgb(243, 243, 243);
 }