diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2ac7102
--- /dev/null
+++ b/README.md
@@ -0,0 +1,35 @@
+# cookienotice-ojs-plugin
+
+A minimal, vanilla JS (ES6+) cookie notification plugin for [OJS](https://github.com/pkp/ojs)
+for use on [Publicera](https://publicera.kb.se), an OJS portal hosted by the National Library of Sweden.
+
+Installation
+------------
+* Download and extract the latest release from the [releases section](https://github.com/Kungbib/cookienotice-ojs-plugin/releases).
+
+* Place the `cookieNotice` directory in your OJS installation's `plugins/generic` directory, or use "Upload A New Plugin" from within the OJS admin interface, if you don't have direct access to the server.
+
+* Make sure the plugin is enabled under Administration -> Site Settings -> Plugins (under "Generic Plugins").
+
+Note that this is a site-wide plugin. It can only be activated/deactivated on site level.
+
+It simply loads a tiny bit of JS that checks whether the cookie `cookieNotice` has been set. If not,
+it injects some HTML with cookie information and a button. If the button is clicked, the cookie is set
+and the cookie information disappears.
+
+If you find that the cookie notice is only shown on the main site and not on individual journals, `cd`
+to the OJS root directory and run:
+
+  php lib/pkp/tools/installPluginVersion.php plugins/generic/cookieNotice/version.xm
+
+Creating a new release
+----------------------
+Bump the plugin version in `cookieNotice/version.xml`.
+
+Merge develop into master.
+
+In the root directory (cookienotice-ojs-plugin), create a tar file with the latest code:
+```
+tar czf cookieNotice.tar.gz --directory=$(pwd) cookieNotice/
+```
+Create a new GitHub release, tag the new version (`v.<M>.<m>.<p>`) and attach `cookieNotice.tar.gz`. 
diff --git a/cookieNotice/CookieNoticePlugin.inc.php b/cookieNotice/CookieNoticePlugin.inc.php
new file mode 100644
index 0000000..0cd848d
--- /dev/null
+++ b/cookieNotice/CookieNoticePlugin.inc.php
@@ -0,0 +1,47 @@
+<?php
+import('lib.pkp.classes.plugins.GenericPlugin');
+
+class CookieNoticePlugin extends GenericPlugin {
+    public function register($category, $path, $mainContextId = NULL) {
+        $success = parent::register($category, $path);
+
+        if ($success && $this->getEnabled()) {
+            $request = Application::get()->getRequest();
+            $templateMgr = TemplateManager::getManager($request);
+            $templateMgr->addStyleSheet(
+                'cookieNoticeStyles',
+                $request->getBaseUrl() . '/' . $this->getPluginPath() . '/css/cookieNotice.css',
+                ['context' => ['backend', 'frontend']]
+            );
+            $templateMgr->addJavaScript(
+                'cookieNoticeScript',
+                $request->getBaseUrl() . '/' . $this->getPluginPath() . '/js/cookieNotice.js',
+                ['context' => ['backend', 'frontend']]
+            );
+        }
+
+        return $success;
+    }
+
+    public function getDisplayName() {
+        return __('plugins.generic.cookieNotice.displayName');
+    }
+
+    public function getDescription() {
+        return __('plugins.generic.cookieNotice.description');
+    }
+
+    public function isSitePlugin() {
+        return true;
+    }
+
+    // Can only be activated at site level.
+    function getCanEnable() {
+        return !((bool) Application::get()->getRequest()->getContext());
+    }
+
+    // Can only be deactivated at site level.
+    function getCanDisable() {
+        return !((bool) Application::get()->getRequest()->getContext());
+    }
+}
diff --git a/cookieNotice/css/cookieNotice.css b/cookieNotice/css/cookieNotice.css
new file mode 100644
index 0000000..c28ceec
--- /dev/null
+++ b/cookieNotice/css/cookieNotice.css
@@ -0,0 +1,7 @@
+#cookie-notice button {
+  text-transform: none;
+}
+
+.cookie-notice-hidden {
+  display: none;
+}
\ No newline at end of file
diff --git a/cookieNotice/index.php b/cookieNotice/index.php
new file mode 100644
index 0000000..94dd10c
--- /dev/null
+++ b/cookieNotice/index.php
@@ -0,0 +1,4 @@
+<?php
+
+require_once('CookieNoticePlugin.inc.php');
+return new CookieNoticePlugin();
diff --git a/cookieNotice/js/cookieNotice.js b/cookieNotice/js/cookieNotice.js
new file mode 100644
index 0000000..330410c
--- /dev/null
+++ b/cookieNotice/js/cookieNotice.js
@@ -0,0 +1,20 @@
+let cookieInfoUrl = 'https://publicera.kb.se/kakor';
+let cookieDurationDays = 365;
+
+document.addEventListener('DOMContentLoaded', function() {
+  if (!document.cookie.split(';').some((item) => item.trim().startsWith('cookieNotice='))) {
+      const confirmationHtml = `
+        <div id="cookie-notice" class="alert alert-primary" role="alert">
+          <div class="container">
+            Genom att använda Publicera godkänner du de kakor (cookies) som finns på webbplatsen. <a href="${cookieInfoUrl}">Läs mer om hur vi använder kakor</a>.
+            <button id="cookie-notice-confirmation" type="button" class="btn btn-secondary btn-light btn-sm">OK, jag förstår</button>
+          </div>
+        </div>
+      `;
+      document.body.insertAdjacentHTML('afterbegin', confirmationHtml);
+      document.getElementById('cookie-notice-confirmation').addEventListener('click', function() {
+        document.cookie = `cookieNotice=1; max-age=${60*60*24*cookieDurationDays}`;
+        document.getElementById('cookie-notice').classList.add('cookie-notice-hidden');
+      });
+  }
+});
\ No newline at end of file
diff --git a/cookieNotice/locale/en_US/locale.po b/cookieNotice/locale/en_US/locale.po
new file mode 100644
index 0000000..8c0db31
--- /dev/null
+++ b/cookieNotice/locale/en_US/locale.po
@@ -0,0 +1,5 @@
+msgid "plugins.generic.cookieNotice.displayName"
+msgstr "Cookie Notice Plugin"
+
+msgid "plugins.generic.cookieNotice.description"
+msgstr "Turns on a site-wide cookie notice."
diff --git a/cookieNotice/locale/sv_SE/locale.po b/cookieNotice/locale/sv_SE/locale.po
new file mode 100644
index 0000000..d8d68bd
--- /dev/null
+++ b/cookieNotice/locale/sv_SE/locale.po
@@ -0,0 +1,5 @@
+msgid "plugins.generic.cookieNotice.displayName"
+msgstr "Cookie-notifieringsplugin"
+
+msgid "plugins.generic.cookieNotice.description"
+msgstr "Informerar besökare om att cookies används."
diff --git a/cookieNotice/version.xml b/cookieNotice/version.xml
new file mode 100644
index 0000000..c22feea
--- /dev/null
+++ b/cookieNotice/version.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE version SYSTEM "../../../lib/pkp/dtd/pluginVersion.dtd">
+<version>
+  <application>cookieNotice</application>
+  <type>plugins.generic</type>
+  <release>1.0.0</release>
+  <date>2021-05-25</date>
+  <lazy-load>1</lazy-load>
+  <sitewide>1</sitewide>
+  <class>CookieNoticePlugin</class>
+</version>
\ No newline at end of file