public function testGetEncryptionData()
 {
     $permissions = array('print');
     $enc = new \Com\Tecnick\Pdf\Encrypt\Encrypt(true, md5('file_id'), 0, $permissions, 'alpha', 'beta');
     $result = $enc->getEncryptionData();
     $this->assertEquals('68bdb9944269edc95d1787eb6337de7a', md5(serialize($result)));
     $this->assertEquals(2147422008, $result['protection']);
     $this->assertEquals(1, $result['V']);
     $this->assertEquals(40, $result['Length']);
     $this->assertEquals('V2', $result['CF']['CFM']);
 }