diff --git a/PhpOffice/PhpWord/Writer/PDF/TCPDF.php b/PhpOffice/PhpWord/Writer/PDF/TCPDF.php
index 02853ed..0439a9a 100755
--- a/PhpOffice/PhpWord/Writer/PDF/TCPDF.php
+++ b/PhpOffice/PhpWord/Writer/PDF/TCPDF.php
@@ -33,7 +33,7 @@ class TCPDF extends AbstractRenderer implements WriterInterface
      *
      * @var string
      */
-    protected $includeFile = 'tcpdf.php';
+    protected $includeFile = 'TCPDF.php';
 
     /**
      * Gets the implementation of external PDF library that should be used.
diff --git a/tcpdf/tcpdf.php b/tcpdf/TCPDF.php
old mode 100755
new mode 100644
similarity index 99%
rename from tcpdf/tcpdf.php
rename to tcpdf/TCPDF.php
index 29dfd6d..8ef09e7
--- a/tcpdf/tcpdf.php
+++ b/tcpdf/TCPDF.php
@@ -1,6 +1,6 @@
 <?php declare(strict_types=1);
 //============================================================+
-// File name   : tcpdf.php
+// File name   : TCPDF.php
 // Version     : 6.4.4
 // Begin       : 2002-08-03
 // Last Update : 2021-12-31
@@ -110,15 +110,15 @@
 // TCPDF configuration
 require_once(__DIR__.'/tcpdf_autoconfig.php');
 // TCPDF static font methods and data
-require_once(__DIR__.'/include/tcpdf_font_data.php');
+require_once(__DIR__.'/include/TCPDF_FONT_DATA.php');
 // TCPDF static font methods and data
-require_once(__DIR__.'/include/tcpdf_fonts.php');
+require_once(__DIR__.'/include/TCPDF_FONTS.php');
 // TCPDF static color methods and data
-require_once(__DIR__.'/include/tcpdf_colors.php');
+require_once(__DIR__.'/include/TCPDF_COLORS.php');
 // TCPDF static image methods and data
-require_once(__DIR__.'/include/tcpdf_images.php');
+require_once(__DIR__.'/include/TCPDF_IMAGES.php');
 // TCPDF static methods and data
-require_once(__DIR__.'/include/tcpdf_static.php');
+require_once(__DIR__.'/include/TCPDF_STATIC.php');
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
diff --git a/tcpdf/tcpdf_barcodes_2d.php b/tcpdf/TCPDF2DBarcode.php
old mode 100755
new mode 100644
similarity index 98%
rename from tcpdf/tcpdf_barcodes_2d.php
rename to tcpdf/TCPDF2DBarcode.php
index 608fb48..f08e35e
--- a/tcpdf/tcpdf_barcodes_2d.php
+++ b/tcpdf/TCPDF2DBarcode.php
@@ -252,14 +252,14 @@ class TCPDF2DBarcode {
 		$qrtype = \strtoupper($mode[0]);
 		switch ($qrtype) {
 			case 'DATAMATRIX': { // DATAMATRIX (ISO/IEC 16022)
-				require_once(\dirname(__FILE__).'/include/barcodes/datamatrix.php');
+				require_once(\dirname(__FILE__).'/include/barcodes/Datamatrix.php');
 				$qrcode                      = new Datamatrix($code);
 				$this->barcode_array         = $qrcode->getBarcodeArray();
 				$this->barcode_array['code'] = $code;
 				break;
 			}
 			case 'PDF417': { // PDF417 (ISO/IEC 15438:2006)
-				require_once(\dirname(__FILE__).'/include/barcodes/pdf417.php');
+				require_once(\dirname(__FILE__).'/include/barcodes/PDF417.php');
 				if (!isset($mode[1]) || ($mode[1] === '')) {
 					$aspectratio = 2; // default aspect ratio (width / height)
 				} else {
@@ -290,7 +290,7 @@ class TCPDF2DBarcode {
 				break;
 			}
 			case 'QRCODE': { // QR-CODE
-				require_once(\dirname(__FILE__).'/include/barcodes/qrcode.php');
+				require_once(\dirname(__FILE__).'/include/barcodes/QRcode.php');
 				if (!isset($mode[1]) || (!\in_array($mode[1],['L','M','Q','H']))) {
 					$mode[1] = 'L'; // Ddefault: Low error correction
 				}
diff --git a/tcpdf/tcpdf_barcodes_1d.php b/tcpdf/TCPDFBarcode.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/tcpdf_barcodes_1d.php
rename to tcpdf/TCPDFBarcode.php
diff --git a/tcpdf/tcpdf_import.php b/tcpdf/TCPDF_IMPORT.php
old mode 100755
new mode 100644
similarity index 98%
rename from tcpdf/tcpdf_import.php
rename to tcpdf/TCPDF_IMPORT.php
index 70ec127..77ed0e7
--- a/tcpdf/tcpdf_import.php
+++ b/tcpdf/TCPDF_IMPORT.php
@@ -43,7 +43,7 @@
  */
 
 // include the TCPDF class
-require_once(\dirname(__FILE__).'/tcpdf.php');
+require_once(\dirname(__FILE__).'/TCPDF.php');
 // include PDF parser class
 require_once(\dirname(__FILE__).'/tcpdf_parser.php');
 
diff --git a/tcpdf/tcpdf_parser.php b/tcpdf/TCPDF_PARSER.php
old mode 100755
new mode 100644
similarity index 99%
rename from tcpdf/tcpdf_parser.php
rename to tcpdf/TCPDF_PARSER.php
index 02100cb..19c47e3
--- a/tcpdf/tcpdf_parser.php
+++ b/tcpdf/TCPDF_PARSER.php
@@ -41,7 +41,7 @@
  */
 
 // include class for decoding filters
-require_once(\dirname(__FILE__).'/include/tcpdf_filters.php');
+require_once(\dirname(__FILE__).'/include/TCPDF_FILTERS.php');
 
 /**
  * @class TCPDF_PARSER
diff --git a/tcpdf/examples/tcpdf_include.php b/tcpdf/examples/tcpdf_include.php
index 0ec20a2..08412d8 100755
--- a/tcpdf/examples/tcpdf_include.php
+++ b/tcpdf/examples/tcpdf_include.php
@@ -28,14 +28,14 @@ require_once('config/tcpdf_config_alt.php');
 
 // Include the main TCPDF library (search the library on the following directories).
 $tcpdf_include_dirs = [
-    \realpath(\dirname(__FILE__) . '/../tcpdf.php'),// True source file
-	\realpath('../tcpdf.php'),// Relative from $PWD
-	'/usr/share/php/tcpdf/tcpdf.php',
-	'/usr/share/tcpdf/tcpdf.php',
-	'/usr/share/php-tcpdf/tcpdf.php',
-	'/var/www/tcpdf/tcpdf.php',
-	'/var/www/html/tcpdf/tcpdf.php',
-	'/usr/local/apache2/htdocs/tcpdf/tcpdf.php',
+    \realpath(\dirname(__FILE__) . '/../TCPDF.php'),// True source file
+	\realpath('../TCPDF.php'),// Relative from $PWD
+	'/usr/share/php/tcpdf/TCPDF.php',
+	'/usr/share/tcpdf/TCPDF.php',
+	'/usr/share/php-tcpdf/TCPDF.php',
+	'/var/www/tcpdf/TCPDF.php',
+	'/var/www/html/tcpdf/TCPDF.php',
+	'/usr/local/apache2/htdocs/tcpdf/TCPDF.php',
 ];
 foreach ($tcpdf_include_dirs as $tcpdf_include_path) {
 	if (@\file_exists($tcpdf_include_path)) {
diff --git a/tcpdf/include/tcpdf_colors.php b/tcpdf/include/TCPDF_COLORS.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/tcpdf_colors.php
rename to tcpdf/include/TCPDF_COLORS.php
diff --git a/tcpdf/include/tcpdf_filters.php b/tcpdf/include/TCPDF_FILTERS.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/tcpdf_filters.php
rename to tcpdf/include/TCPDF_FILTERS.php
diff --git a/tcpdf/include/tcpdf_fonts.php b/tcpdf/include/TCPDF_FONTS.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/tcpdf_fonts.php
rename to tcpdf/include/TCPDF_FONTS.php
diff --git a/tcpdf/include/tcpdf_font_data.php b/tcpdf/include/TCPDF_FONT_DATA.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/tcpdf_font_data.php
rename to tcpdf/include/TCPDF_FONT_DATA.php
diff --git a/tcpdf/include/tcpdf_images.php b/tcpdf/include/TCPDF_IMAGES.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/tcpdf_images.php
rename to tcpdf/include/TCPDF_IMAGES.php
diff --git a/tcpdf/include/tcpdf_static.php b/tcpdf/include/TCPDF_STATIC.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/tcpdf_static.php
rename to tcpdf/include/TCPDF_STATIC.php
diff --git a/tcpdf/include/barcodes/datamatrix.php b/tcpdf/include/barcodes/Datamatrix.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/barcodes/datamatrix.php
rename to tcpdf/include/barcodes/Datamatrix.php
diff --git a/tcpdf/include/barcodes/pdf417.php b/tcpdf/include/barcodes/PDF417.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/barcodes/pdf417.php
rename to tcpdf/include/barcodes/PDF417.php
diff --git a/tcpdf/include/barcodes/qrcode.php b/tcpdf/include/barcodes/QRcode.php
old mode 100755
new mode 100644
similarity index 100%
rename from tcpdf/include/barcodes/qrcode.php
rename to tcpdf/include/barcodes/QRcode.php
diff --git a/tcpdf/tools/tcpdf_addfont.php b/tcpdf/tools/tcpdf_addfont.php
index b63f855..a86168f 100755
--- a/tcpdf/tools/tcpdf_addfont.php
+++ b/tcpdf/tools/tcpdf_addfont.php
@@ -46,7 +46,7 @@ if (PHP_SAPI != 'cli') {
   exit(1);
 }
 
-$tcpdf_include_dirs = [\realpath(\dirname(__FILE__).'/../tcpdf.php'), '/usr/share/php/tcpdf/tcpdf.php', '/usr/share/tcpdf/tcpdf.php', '/usr/share/php-tcpdf/tcpdf.php', '/var/www/tcpdf/tcpdf.php', '/var/www/html/tcpdf/tcpdf.php', '/usr/local/apache2/htdocs/tcpdf/tcpdf.php'];
+$tcpdf_include_dirs = [\realpath(\dirname(__FILE__).'/../TCPDF.php'), '/usr/share/php/tcpdf/TCPDF.php', '/usr/share/tcpdf/TCPDF.php', '/usr/share/php-tcpdf/TCPDF.php', '/var/www/tcpdf/TCPDF.php', '/var/www/html/tcpdf/TCPDF.php', '/usr/local/apache2/htdocs/tcpdf/TCPDF.php'];
 foreach ($tcpdf_include_dirs as $tcpdf_include_path) {
 	if (@\file_exists($tcpdf_include_path)) {
 		require_once($tcpdf_include_path);