diff -ruN typo3_src-4.2.6.orig/t3lib/config_default.php typo3_src-4.2.6/t3lib/config_default.php
--- typo3_src-4.2.6.orig/t3lib/config_default.php	2009-02-10 10:36:25.000000000 +0100
+++ typo3_src-4.2.6/t3lib/config_default.php	2009-05-15 22:46:55.000000000 +0200
@@ -65,6 +65,7 @@
 		'devIPmask' => '127.0.0.1,::1',			// Defines a list of IP addresses which will allow development-output to display. The debug() function will use this as a filter. See the function t3lib_div::cmpIP() for details on syntax. Setting this to blank value will deny all. Setting to "*" will allow all.
 		'sqlDebug' => 0,						// Boolean. If set, then database queries that fails are outputted in browser. For development.
 		'enable_DLOG' => FALSE,					// Whether the developer log is enabled. See constant "TYPO3_DLOG"
+		'disableVersionDisplay' => 1,				// Disable the visibility of version in meta tag
 		'ddmmyy' => 'd-m-y',					// Format of Date-Month-Year - see PHP-function date()
 		'hhmm' => 'H:i',						// Format of Hours-Minutes - see PHP-function date()
 		'USdateFormat' => 0,					// Boolean. If true, dates entered in the TCEforms of the backend will be formatted mm-dd-yyyy
diff -ruN typo3_src-4.2.6.orig/typo3/sysext/cms/tslib/class.tslib_pagegen.php typo3_src-4.2.6/typo3/sysext/cms/tslib/class.tslib_pagegen.php
--- typo3_src-4.2.6.orig/typo3/sysext/cms/tslib/class.tslib_pagegen.php	2009-02-10 10:36:51.000000000 +0100
+++ typo3_src-4.2.6/typo3/sysext/cms/tslib/class.tslib_pagegen.php	2009-05-15 22:40:21.000000000 +0200
@@ -678,8 +678,9 @@
 			$GLOBALS['TSFE']->content.='
 	<title>'.htmlspecialchars($titleTagContent).'</title>';
 		}
+		$version = ($GLOBALS['TYPO3_CONF_VARS']['SYS']['disableVersionDisplay'] == '1') ? '' : TYPO3_branch;
 		$GLOBALS['TSFE']->content.='
-	<meta name="generator" content="TYPO3 '.TYPO3_branch.' CMS" />';
+	<meta name="generator" content="TYPO3 '.$version.' CMS" />';
 
 		$conf=$GLOBALS['TSFE']->pSetup['meta.'];
 		if (is_array($conf))	{
diff -ruN typo3_src-4.2.6.orig/typo3/template.php typo3_src-4.2.6/typo3/template.php
--- typo3_src-4.2.6.orig/typo3/template.php	2009-02-10 10:37:06.000000000 +0100
+++ typo3_src-4.2.6/typo3/template.php	2009-05-15 22:39:52.000000000 +0200
@@ -989,7 +989,8 @@
 	 * @return	string		<meta> tag with name "generator"
 	 */
 	function generator()	{
-		$str = 'TYPO3 '.TYPO3_branch.', http://typo3.com, &#169; Kasper Sk&#229;rh&#248;j 1998-2008, extensions are copyright of their respective owners.';
+		$version = ($GLOBALS['TYPO3_CONF_VARS']['SYS']['disableVersionDisplay'] == '1') ? '' : TYPO3_branch;
+		$str = 'TYPO3 '.$version.', http://typo3.com, &#169; Kasper Sk&#229;rh&#248;j 1998-2008, extensions are copyright of their respective owners.';
 		return '<meta name="generator" content="'.$str .'" />';
 	}