diff --git a/README.md b/README.md
index 36c9e1b..8ffb69c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+<!--
+SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+SPDX-License-Identifier:  CC0-1.0
+-->
 # Nextcloud Calibre2OPDS app
 
 The Calibre2OPDS app provides access to user's [Calibre](https://calibre-ebook.com/) library
diff --git a/generate-icon.sh b/generate-icon.sh
index bfe4f30..ab4a59a 100755
--- a/generate-icon.sh
+++ b/generate-icon.sh
@@ -1,5 +1,8 @@
 #!/bin/sh
 #
+# SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+# SPDX-License-Identifier:  CC0-1.0
+#
 # This requires:
 # - librsvg2-bin (for `rsvg-convert`);
 # - netpbm (for `pngtopam` and `pamtowinicon`).
diff --git a/img/icon.svg b/img/icon.svg
index 1a64385..6e0fcc6 100644
--- a/img/icon.svg
+++ b/img/icon.svg
@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" height="128" width="128">
+<!--
+	SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+	SPDX-License-Identifier:  CC0-1.0
+-->
 	<title>Icon for Calibre2OPDS</title>
 	<style>
 		.book1 {
diff --git a/js/settings.js b/js/settings.js
index 2d02b0b..b261390 100644
--- a/js/settings.js
+++ b/js/settings.js
@@ -1,4 +1,7 @@
 /**
+ * SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
  * Update Calibre2OPDS settings
  */
 (function (window, document, $) {
diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index b4bde09..0bbaf22 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\AppInfo;
 
diff --git a/lib/Calibre/CalibreDB.php b/lib/Calibre/CalibreDB.php
index fc62750..d426704 100644
--- a/lib/Calibre/CalibreDB.php
+++ b/lib/Calibre/CalibreDB.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre;
 
diff --git a/lib/Calibre/CalibreItem.php b/lib/Calibre/CalibreItem.php
index 3f03c5f..6c44b7c 100644
--- a/lib/Calibre/CalibreItem.php
+++ b/lib/Calibre/CalibreItem.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre;
 
diff --git a/lib/Calibre/ICalibreDB.php b/lib/Calibre/ICalibreDB.php
index 327bc4d..293a243 100644
--- a/lib/Calibre/ICalibreDB.php
+++ b/lib/Calibre/ICalibreDB.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre;
 
diff --git a/lib/Calibre/Types/CalibreAuthor.php b/lib/Calibre/Types/CalibreAuthor.php
index c49cc94..49e93cf 100644
--- a/lib/Calibre/Types/CalibreAuthor.php
+++ b/lib/Calibre/Types/CalibreAuthor.php
@@ -1,5 +1,9 @@
 <?php
 
+declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
 use OCA\Calibre2OPDS\Calibre\CalibreItem;
diff --git a/lib/Calibre/Types/CalibreAuthorPrefix.php b/lib/Calibre/Types/CalibreAuthorPrefix.php
index ec5a93a..990758c 100644
--- a/lib/Calibre/Types/CalibreAuthorPrefix.php
+++ b/lib/Calibre/Types/CalibreAuthorPrefix.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibreBook.php b/lib/Calibre/Types/CalibreBook.php
index d38a8f4..2386d51 100644
--- a/lib/Calibre/Types/CalibreBook.php
+++ b/lib/Calibre/Types/CalibreBook.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibreBookCriteria.php b/lib/Calibre/Types/CalibreBookCriteria.php
index faa1fa7..3d8d2d4 100644
--- a/lib/Calibre/Types/CalibreBookCriteria.php
+++ b/lib/Calibre/Types/CalibreBookCriteria.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibreBookFormat.php b/lib/Calibre/Types/CalibreBookFormat.php
index d182416..23ddb42 100644
--- a/lib/Calibre/Types/CalibreBookFormat.php
+++ b/lib/Calibre/Types/CalibreBookFormat.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibreBookId.php b/lib/Calibre/Types/CalibreBookId.php
index 0c71f45..cef1653 100644
--- a/lib/Calibre/Types/CalibreBookId.php
+++ b/lib/Calibre/Types/CalibreBookId.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibreLanguage.php b/lib/Calibre/Types/CalibreLanguage.php
index 221b237..439f251 100644
--- a/lib/Calibre/Types/CalibreLanguage.php
+++ b/lib/Calibre/Types/CalibreLanguage.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibrePublisher.php b/lib/Calibre/Types/CalibrePublisher.php
index a3ff768..dd388d9 100644
--- a/lib/Calibre/Types/CalibrePublisher.php
+++ b/lib/Calibre/Types/CalibrePublisher.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibreSeries.php b/lib/Calibre/Types/CalibreSeries.php
index 199c821..5ab7e4b 100644
--- a/lib/Calibre/Types/CalibreSeries.php
+++ b/lib/Calibre/Types/CalibreSeries.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Calibre/Types/CalibreTag.php b/lib/Calibre/Types/CalibreTag.php
index e3ee821..0dbfb9f 100644
--- a/lib/Calibre/Types/CalibreTag.php
+++ b/lib/Calibre/Types/CalibreTag.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Calibre\Types;
 
diff --git a/lib/Controller/OpdsController.php b/lib/Controller/OpdsController.php
index 25126db..b46cb8e 100644
--- a/lib/Controller/OpdsController.php
+++ b/lib/Controller/OpdsController.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Controller;
 
diff --git a/lib/Controller/SettingsController.php b/lib/Controller/SettingsController.php
index dfffcaf..bd29310 100644
--- a/lib/Controller/SettingsController.php
+++ b/lib/Controller/SettingsController.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Controller;
 
diff --git a/lib/FeedBuilder/IOpdsFeedBuilder.php b/lib/FeedBuilder/IOpdsFeedBuilder.php
index bd1201b..cf5d368 100644
--- a/lib/FeedBuilder/IOpdsFeedBuilder.php
+++ b/lib/FeedBuilder/IOpdsFeedBuilder.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\FeedBuilder;
 
diff --git a/lib/FeedBuilder/OpdsFeedBuilder.php b/lib/FeedBuilder/OpdsFeedBuilder.php
index a32ae16..752bcf1 100644
--- a/lib/FeedBuilder/OpdsFeedBuilder.php
+++ b/lib/FeedBuilder/OpdsFeedBuilder.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\FeedBuilder;
 
diff --git a/lib/Opds/OpdsApp.php b/lib/Opds/OpdsApp.php
index 47ffade..6287d81 100644
--- a/lib/Opds/OpdsApp.php
+++ b/lib/Opds/OpdsApp.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Opds/OpdsAttribute.php b/lib/Opds/OpdsAttribute.php
index 66f0d7d..2a3830a 100644
--- a/lib/Opds/OpdsAttribute.php
+++ b/lib/Opds/OpdsAttribute.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Opds/OpdsAuthor.php b/lib/Opds/OpdsAuthor.php
index c078a1d..8883f87 100644
--- a/lib/Opds/OpdsAuthor.php
+++ b/lib/Opds/OpdsAuthor.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Opds/OpdsCategory.php b/lib/Opds/OpdsCategory.php
index 66d0dc1..72ec613 100644
--- a/lib/Opds/OpdsCategory.php
+++ b/lib/Opds/OpdsCategory.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Opds/OpdsEntry.php b/lib/Opds/OpdsEntry.php
index 4e86ab8..dec4d91 100644
--- a/lib/Opds/OpdsEntry.php
+++ b/lib/Opds/OpdsEntry.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Opds/OpdsLink.php b/lib/Opds/OpdsLink.php
index 1a0efc0..16084d9 100644
--- a/lib/Opds/OpdsLink.php
+++ b/lib/Opds/OpdsLink.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Opds/OpdsResponse.php b/lib/Opds/OpdsResponse.php
index 7333fdc..80465f5 100644
--- a/lib/Opds/OpdsResponse.php
+++ b/lib/Opds/OpdsResponse.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Opds/OpenSearchResponse.php b/lib/Opds/OpenSearchResponse.php
index 5f92cf2..9dfc7a3 100644
--- a/lib/Opds/OpenSearchResponse.php
+++ b/lib/Opds/OpenSearchResponse.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Opds;
 
diff --git a/lib/Service/CalibreService.php b/lib/Service/CalibreService.php
index 1b8dc75..0a08838 100644
--- a/lib/Service/CalibreService.php
+++ b/lib/Service/CalibreService.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Service;
 
diff --git a/lib/Service/ICalibreService.php b/lib/Service/ICalibreService.php
index 160ab78..7f4abcc 100644
--- a/lib/Service/ICalibreService.php
+++ b/lib/Service/ICalibreService.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Service;
 
diff --git a/lib/Service/IOpdsFeedService.php b/lib/Service/IOpdsFeedService.php
index f9d99d4..683383e 100644
--- a/lib/Service/IOpdsFeedService.php
+++ b/lib/Service/IOpdsFeedService.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Service;
 
diff --git a/lib/Service/ISettingsService.php b/lib/Service/ISettingsService.php
index 4e89341..bc8c381 100644
--- a/lib/Service/ISettingsService.php
+++ b/lib/Service/ISettingsService.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Service;
 
diff --git a/lib/Service/OpdsFeedService.php b/lib/Service/OpdsFeedService.php
index 9384742..330440b 100644
--- a/lib/Service/OpdsFeedService.php
+++ b/lib/Service/OpdsFeedService.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Service;
 
diff --git a/lib/Service/SettingsService.php b/lib/Service/SettingsService.php
index 32aa0a1..ef27b60 100644
--- a/lib/Service/SettingsService.php
+++ b/lib/Service/SettingsService.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Service;
 
diff --git a/lib/Settings/PersonalSettings.php b/lib/Settings/PersonalSettings.php
index 5980951..52969e5 100644
--- a/lib/Settings/PersonalSettings.php
+++ b/lib/Settings/PersonalSettings.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Settings;
 
diff --git a/lib/Util/MapIterator.php b/lib/Util/MapIterator.php
index 2a27dc6..bebfb7d 100644
--- a/lib/Util/MapIterator.php
+++ b/lib/Util/MapIterator.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Util;
 
diff --git a/lib/Util/MimeTypes.php b/lib/Util/MimeTypes.php
index a855180..1be8262 100644
--- a/lib/Util/MimeTypes.php
+++ b/lib/Util/MimeTypes.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace OCA\Calibre2OPDS\Util;
 
diff --git a/templates/settings.personal.php b/templates/settings.personal.php
index b25fba5..155ef9b 100644
--- a/templates/settings.personal.php
+++ b/templates/settings.personal.php
@@ -1,4 +1,9 @@
-<?php script('calibre_opds', 'settings'); ?>
+<?php
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+script('calibre_opds', 'settings');
+?>
 <div id="calibre_opds" class="section">
 	<h2><?php p($l->t('Calibre OPDS library')); ?></h2>
 	<form action="personal.php">
diff --git a/tests/stubs/CalibreStub.php b/tests/stubs/CalibreStub.php
index c2bae7f..5ecb4e2 100644
--- a/tests/stubs/CalibreStub.php
+++ b/tests/stubs/CalibreStub.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace Stubs;
 
diff --git a/tests/stubs/L10NStub.php b/tests/stubs/L10NStub.php
index 0841eeb..cd3f743 100644
--- a/tests/stubs/L10NStub.php
+++ b/tests/stubs/L10NStub.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace Stubs;
 
diff --git a/tests/stubs/LoggerInterfaceStub.php b/tests/stubs/LoggerInterfaceStub.php
index 8869394..db49853 100644
--- a/tests/stubs/LoggerInterfaceStub.php
+++ b/tests/stubs/LoggerInterfaceStub.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace Stubs;
 
diff --git a/tests/stubs/SettingsServiceStub.php b/tests/stubs/SettingsServiceStub.php
index 00b9bae..302714c 100644
--- a/tests/stubs/SettingsServiceStub.php
+++ b/tests/stubs/SettingsServiceStub.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace Stubs;
 
diff --git a/tests/stubs/StorageStub.php b/tests/stubs/StorageStub.php
index 8691276..c8473cc 100644
--- a/tests/stubs/StorageStub.php
+++ b/tests/stubs/StorageStub.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace Stubs;
 
diff --git a/tests/stubs/URLGeneratorStub.php b/tests/stubs/URLGeneratorStub.php
index a04fbe7..08d8d72 100644
--- a/tests/stubs/URLGeneratorStub.php
+++ b/tests/stubs/URLGeneratorStub.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 namespace Stubs;
 
diff --git a/tests/unit/CalibreTest.php b/tests/unit/CalibreTest.php
index ab52d25..2b87ffa 100644
--- a/tests/unit/CalibreTest.php
+++ b/tests/unit/CalibreTest.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 use OCA\Calibre2OPDS\Calibre\CalibreDB;
 use OCA\Calibre2OPDS\Calibre\CalibreItem;
diff --git a/tests/unit/OpdsFeedTest.php b/tests/unit/OpdsFeedTest.php
index 10abf86..c45ef90 100644
--- a/tests/unit/OpdsFeedTest.php
+++ b/tests/unit/OpdsFeedTest.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 use OCA\Calibre2OPDS\Calibre\ICalibreDB;
 use OCA\Calibre2OPDS\Calibre\Types\CalibreAuthor;
diff --git a/tests/unit/OpdsSearchTest.php b/tests/unit/OpdsSearchTest.php
index 10ec786..b41c847 100644
--- a/tests/unit/OpdsSearchTest.php
+++ b/tests/unit/OpdsSearchTest.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 use OCA\Calibre2OPDS\Opds\OpenSearchResponse;
 use PHPUnit\Framework\TestCase;
diff --git a/tests/unit/OpdsTest.php b/tests/unit/OpdsTest.php
index 42eacdd..eaabee7 100644
--- a/tests/unit/OpdsTest.php
+++ b/tests/unit/OpdsTest.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 use OCA\Calibre2OPDS\Opds\OpdsApp;
 use OCA\Calibre2OPDS\Opds\OpdsAttribute;
diff --git a/tests/unit/UtilTest.php b/tests/unit/UtilTest.php
index 00c7f30..33f249d 100644
--- a/tests/unit/UtilTest.php
+++ b/tests/unit/UtilTest.php
@@ -1,6 +1,8 @@
 <?php
 
 declare(strict_types=1);
+// SPDX-FileCopyrightText: 2023 Alec Kojaev <alec@kojaev.name>
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 use OCA\Calibre2OPDS\Util\MapIterator;
 use OCA\Calibre2OPDS\Util\MimeTypes;