diff --git a/.editorconfig b/.editorconfig
index 961083e..23c17a1 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+#
+# SPDX-License-Identifier: MIT
+
 root = true
 
 [*]
diff --git a/.github/workflows/npm_publish.yml b/.github/workflows/npm_publish.yml
index e180bf4..f20190c 100644
--- a/.github/workflows/npm_publish.yml
+++ b/.github/workflows/npm_publish.yml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+#
+# SPDX-License-Identifier: MIT
+
 name: Publish Package to npmjs
 on:
   release:
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d496ad5..51a7d20 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+#
+# SPDX-License-Identifier: MIT
+
 name: Tests
 
 on:
diff --git a/.hooks/pre-commit b/.hooks/pre-commit
index 587c838..c8623f6 100755
--- a/.hooks/pre-commit
+++ b/.hooks/pre-commit
@@ -1,5 +1,9 @@
 #!/bin/sh
 
+# SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+#
+# SPDX-License-Identifier: MIT
+
 set -eu
 set -o pipefail
 
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index 6b68ea4..b992c1e 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: Coraline Ada Ehmke
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
 # Contributor Covenant Code of Conduct
 
 ## Our Pledge
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c0a1ae6..819803a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
 # Contributing Guidelines
 
 ## Code of Conduct
diff --git a/README.md b/README.md
index 3089521..8f9138e 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
 # @kindspells/astro-sri-scp
 
 [![NPM Version](https://img.shields.io/npm/v/%40kindspells%2Fastro-sri-csp)](https://www.npmjs.com/package/@kindspells/astro-sri-csp)
diff --git a/SECURITY.md b/SECURITY.md
index a425ecf..49f1958 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
 # Security Policy
 
 ## Supported Versions
diff --git a/main.d.ts b/main.d.ts
index 830e0ce..b6b6ba5 100644
--- a/main.d.ts
+++ b/main.d.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 export type SriCspOptions = {
 	/**
 	 * Specifies the path for the auto-generated module that will contain the SRI
diff --git a/main.mjs b/main.mjs
index 95280af..0455fb8 100644
--- a/main.mjs
+++ b/main.mjs
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 import { fileURLToPath } from 'node:url'
 import { generateSRIHashes } from './core.mjs'
 
diff --git a/tests/core.test.mts b/tests/core.test.mts
index 4e76a72..5985859 100644
--- a/tests/core.test.mts
+++ b/tests/core.test.mts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 import { resolve } from 'node:path'
 
 import { describe, expect, it } from 'vitest'
diff --git a/vitest.config.mts b/vitest.config.mts
index d433f7f..8e51f31 100644
--- a/vitest.config.mts
+++ b/vitest.config.mts
@@ -1,4 +1,9 @@
-// eslint-disable-next-line import/no-unresolved
+/*
+ * SPDX-FileCopyrightText: 2024 KindSpells Labs S.L.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 import { defineConfig } from 'vitest/config'
 
 export default defineConfig({