diff --git a/clearurls.js b/clearurls.js
index 623df8a..1d09125 100644
--- a/clearurls.js
+++ b/clearurls.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /*jshint esversion: 6 */
 /*
 * This script is responsible for the core functionalities.
diff --git a/core_js/log.js b/core_js/log.js
index fc90b10..10cfdbd 100644
--- a/core_js/log.js
+++ b/core_js/log.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /*jshint esversion: 6 */
 /**
 * Get the log and display the data as table.
@@ -41,11 +59,11 @@ function getLog()
         {
             for(var i=0; i<length;i++)
             {
-                row = "<tr>"
-                + "<td>"+log.log[i].before+"</td>"
-                + "<td>"+log.log[i].after+"</td>"
-                + "<td>"+log.log[i].rule+"</td>"
-                + "<td>"+toDate(log.log[i].timestamp)+"</td>";
+                row = "<tr>" +
+                "<td>"+log.log[i].before+"</td>" +
+                "<td>"+log.log[i].after+"</td>" +
+                "<td>"+log.log[i].rule+"</td>" +
+                "<td>"+toDate(log.log[i].timestamp)+"</td>";
                 $('#tbody').append(row);
             }
         }
diff --git a/core_js/message_handler.js b/core_js/message_handler.js
index 032a8d1..cc48d9b 100644
--- a/core_js/message_handler.js
+++ b/core_js/message_handler.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /*jshint esversion: 6 */
 /*
  * This script is responsible for the communication between background and content_scripts.
diff --git a/core_js/popup.js b/core_js/popup.js
index badcc81..d48f21c 100644
--- a/core_js/popup.js
+++ b/core_js/popup.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /*jshint esversion: 6 */
 var element = $("#statistics_value");
 var elGlobalPercentage = $("#statistics_value_global_percentage");
diff --git a/core_js/settings.js b/core_js/settings.js
index a3414af..5c65650 100644
--- a/core_js/settings.js
+++ b/core_js/settings.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 var settings = [];
 
 getData();
diff --git a/core_js/storage.js b/core_js/storage.js
index ca103cc..63c58ff 100644
--- a/core_js/storage.js
+++ b/core_js/storage.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /*jshint esversion: 6 */
 /*
  * This script is responsible for the storage.
diff --git a/core_js/tools.js b/core_js/tools.js
index 1375231..15f83c0 100644
--- a/core_js/tools.js
+++ b/core_js/tools.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /*jshint esversion: 6 */
 /*
  * This script is responsible for some tools.
diff --git a/core_js/write_version.js b/core_js/write_version.js
index a8dabda..10a02a4 100644
--- a/core_js/write_version.js
+++ b/core_js/write_version.js
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /**
  * This file writes only the version into every page.
  * @return version
diff --git a/css/core.css b/css/core.css
index 6c4d16d..0755803 100644
--- a/css/core.css
+++ b/css/core.css
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 body {
     font-size: 13px;
 }
diff --git a/css/switchButtons.css b/css/switchButtons.css
index ac6c5fa..42b6863 100644
--- a/css/switchButtons.css
+++ b/css/switchButtons.css
@@ -1,3 +1,21 @@
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 /*
  * Stylesheet for the switch buttons.
  */
diff --git a/html/log.html b/html/log.html
index 0497b77..c259fac 100644
--- a/html/log.html
+++ b/html/log.html
@@ -1,3 +1,22 @@
+<!--
+ClearURLs
+Copyright (c) 2017-2019 Kevin Röbert
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+-->
+
 <!DOCTYPE html>
 <html lang="en">
 <head>
diff --git a/html/popup.html b/html/popup.html
index 661f88d..4b49153 100644
--- a/html/popup.html
+++ b/html/popup.html
@@ -1,3 +1,22 @@
+<!--
+ClearURLs
+Copyright (c) 2017-2019 Kevin Röbert
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+-->
+
 <!DOCTYPE html>
 <html lang="en">
 <head>
diff --git a/html/settings.html b/html/settings.html
index 61b3870..4b24acf 100644
--- a/html/settings.html
+++ b/html/settings.html
@@ -1,3 +1,22 @@
+<!--
+ClearURLs
+Copyright (c) 2017-2019 Kevin Röbert
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+-->
+
 <!DOCTYPE html>
 <html lang="en">
 <head>
diff --git a/html/siteBlockedAlert.html b/html/siteBlockedAlert.html
index 9eaeb19..4ad2937 100644
--- a/html/siteBlockedAlert.html
+++ b/html/siteBlockedAlert.html
@@ -1,3 +1,22 @@
+<!--
+ClearURLs
+Copyright (c) 2017-2019 Kevin Röbert
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+-->
+
 <!DOCTYPE html>
 <html lang="en">
 <head>
diff --git a/server/report_url.php b/server/report_url.php
index b9516a4..40be365 100644
--- a/server/report_url.php
+++ b/server/report_url.php
@@ -1,4 +1,22 @@
 <?php
+/*
+ * ClearURLs
+ * Copyright (c) 2017-2019 Kevin Röbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 $servername = "...";
 $username = "...";
 $password = "...";