diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index e5e32a0..b41b3fd 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -1,13 +1,34 @@
 <?php
 
+declare(strict_types=1);
+
 $finder = PhpCsFixer\Finder::create()
     ->in(__DIR__)
 ;
 
+$header = <<<EOF
+Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+
+For the full copyright and license information, please view
+the LICENSE file that was distributed with this source code.
+
+https://www.d3data.de
+
+@copyright (C) D3 Data Development (Inh. Thomas Dartsch)
+@author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+@link      https://www.oxidmodule.com
+EOF;
+
 $config = new PhpCsFixer\Config();
 return $config->setRules([
         '@PHP71Migration' => true,
-        '@PSR12' => true
+        '@PSR12' => true,
+        'header_comment' => [
+            'comment_type' => 'PHPDoc',
+            'header' => $header,
+            'location' => 'after_open',
+            'separate' => 'both',
+        ],
     ])
     ->setFinder($finder)
 ;
\ No newline at end of file
diff --git a/Tests/Unit/Development/CanAccessRestrictedTest.php b/Tests/Unit/Development/CanAccessRestrictedTest.php
index 6071812..288e446 100644
--- a/Tests/Unit/Development/CanAccessRestrictedTest.php
+++ b/Tests/Unit/Development/CanAccessRestrictedTest.php
@@ -1,8 +1,10 @@
 <?php
 
 /**
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
+ * Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
  *
  * https://www.d3data.de
  *
diff --git a/Tests/Unit/Development/HelperClasses/CanAccessRestrictedClass.php b/Tests/Unit/Development/HelperClasses/CanAccessRestrictedClass.php
index 5fc123c..2ad6ce8 100644
--- a/Tests/Unit/Development/HelperClasses/CanAccessRestrictedClass.php
+++ b/Tests/Unit/Development/HelperClasses/CanAccessRestrictedClass.php
@@ -1,8 +1,10 @@
 <?php
 
 /**
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
+ * Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
  *
  * https://www.d3data.de
  *
diff --git a/Tests/Unit/Production/HelperClasses/IsMockableClass.php b/Tests/Unit/Production/HelperClasses/IsMockableClass.php
index 58d8d88..a605679 100644
--- a/Tests/Unit/Production/HelperClasses/IsMockableClass.php
+++ b/Tests/Unit/Production/HelperClasses/IsMockableClass.php
@@ -1,16 +1,16 @@
 <?php
 
 /**
- * This Software is the property of Data Development and is protected
- * by copyright law - it is NOT Freeware.
- * Any unauthorized use of this software without a valid license
- * is a violation of the license agreement and will be prosecuted by
- * civil and criminal law.
- * http://www.shopmodule.com
+ * Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ *
+ * https://www.d3data.de
  *
  * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
- * @author        D3 Data Development - Daniel Seifert <support@shopmodule.com>
- * @link          http://www.oxidmodule.com
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+ * @link      https://www.oxidmodule.com
  */
 
 namespace D3\TestingTools\Tests\Unit\Production\HelperClasses;
diff --git a/Tests/Unit/Production/HelperClasses/IsMockableParent.php b/Tests/Unit/Production/HelperClasses/IsMockableParent.php
index d6b9f88..d13ca9c 100644
--- a/Tests/Unit/Production/HelperClasses/IsMockableParent.php
+++ b/Tests/Unit/Production/HelperClasses/IsMockableParent.php
@@ -1,16 +1,16 @@
 <?php
 
 /**
- * This Software is the property of Data Development and is protected
- * by copyright law - it is NOT Freeware.
- * Any unauthorized use of this software without a valid license
- * is a violation of the license agreement and will be prosecuted by
- * civil and criminal law.
- * http://www.shopmodule.com
+ * Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ *
+ * https://www.d3data.de
  *
  * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
- * @author        D3 Data Development - Daniel Seifert <support@shopmodule.com>
- * @link          http://www.oxidmodule.com
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+ * @link      https://www.oxidmodule.com
  */
 
 namespace D3\TestingTools\Tests\Unit\Production\HelperClasses;
diff --git a/Tests/Unit/Production/IsMockableTest.php b/Tests/Unit/Production/IsMockableTest.php
index e0ad66a..26b10e5 100644
--- a/Tests/Unit/Production/IsMockableTest.php
+++ b/Tests/Unit/Production/IsMockableTest.php
@@ -1,8 +1,10 @@
 <?php
 
 /**
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
+ * Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
  *
  * https://www.d3data.de
  *
diff --git a/src/Development/CanAccessRestricted.php b/src/Development/CanAccessRestricted.php
index 666f59a..c879816 100644
--- a/src/Development/CanAccessRestricted.php
+++ b/src/Development/CanAccessRestricted.php
@@ -1,8 +1,10 @@
 <?php
 
 /**
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
+ * Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
  *
  * https://www.d3data.de
  *
diff --git a/src/Production/IsMockable.php b/src/Production/IsMockable.php
index 4f994a9..d5ee8fc 100644
--- a/src/Production/IsMockable.php
+++ b/src/Production/IsMockable.php
@@ -1,8 +1,10 @@
 <?php
 
 /**
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
+ * Copyright (c) D3 Data Development (Inh. Thomas Dartsch)
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
  *
  * https://www.d3data.de
  *