diff --git a/README.md b/README.md
index cd1c5db..fc54a71 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Roundcube plugin to use Mailvelope's OpenPGP-support
 
-This plugin makes Roundcube webmail <http://roundcube.net/> use the client-API
-of Mailvelope <https://www.mailvelope.com/> in order to create handle OpenPGP
+This plugin makes [Roundcube webmail](https://roundcube.net/) use the client-API
+of [Mailvelope](https://www.mailvelope.com/) in order to create handle OpenPGP
 emails. It's useful only for users that have Mailvelope
 installed in their browser. Users without Mailvelope won't note any difference.
 
@@ -16,9 +16,11 @@ Confirmed to be working with Roundcube v1.0.x.
 To use the plugin drop the code into Roundcube's plugins-folder and enable it
 in Roundcube's config. E.g.:
 
-    cd $roundcube/plugins
-    git clone git://github.com/posteo/mailvelope_client
-    vim ../config/config.inc.php
+```Shell
+cd $roundcube/plugins
+git clone git://github.com/posteo/mailvelope_client
+vim ../config/config.inc.php
+```
 
 
 ## Contribution
diff --git a/composer.json b/composer.json
index 272ad55..1ac9807 100644
--- a/composer.json
+++ b/composer.json
@@ -3,20 +3,20 @@
     "type": "roundcube-plugin",
     "description": "Hook Mailvelope's OpenPGP-support in Roundcube",
     "keywords": ["mail","openpgp"],
-    "homepage": "http://github.com/posteo/mailvelope_client",
-    "license": "GPL-3.0+",
+    "homepage": "https://github.com/posteo/mailvelope_client",
+    "license": "AGPL-3.0+",
     "authors": [
         {
             "name": "Enoch Root",
             "email": "opensource@posteo.de",
-            "homepage": "http://posteo.de/",
+            "homepage": "https://posteo.de/",
             "role": "Developer"
         }
     ],
     "repositories": [
         {
             "type": "composer",
-            "url": "http://plugins.roundcube.net/"
+            "url": "https://plugins.roundcube.net/"
         }
     ],
     "require": {
diff --git a/mailvelope_client.js b/mailvelope_client.js
index 18c2024..aa1c22c 100644
--- a/mailvelope_client.js
+++ b/mailvelope_client.js
@@ -1,3 +1,20 @@
+/*
+Copyright (c) 2015 The "Mailvelope client plugin for Roundcube" Authors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
 function MailvelopeClient(debug) {
 
   //
diff --git a/mailvelope_client.php b/mailvelope_client.php
index e66713c..ddbd9b4 100644
--- a/mailvelope_client.php
+++ b/mailvelope_client.php
@@ -1,10 +1,26 @@
 <?php
+/*
+Copyright (c) 2015 The "Mailvelope client plugin for Roundcube" Authors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 
 /**
  * A client for mailvelopes client-API.
  *
  * @copyright  Copyright (c) 2015 Posteo e.K <https://posteo.de>
- * @license    GNU GPLv3+
+ * @license    AGPLv3+
  */
 class mailvelope_client extends rcube_plugin {
   public function init() {