TYPO3: Hook to remove the generator meta tag (TYPO3 CMS 6.2)

CleanSource.php

<?php
namespace Your\Extension\Namespace\Hooks;

/**
 * Clean up source
 */
class CleanSource extends \TYPO3\CMS\Frontend\Plugin\AbstractPlugin
{

    /**
     * No cache
     *
     * @return void
     */
    public function contentPostProcOutput(&$params, &$that)
    {
        if (!$GLOBALS['TSFE']->isINTincScript()) {
            return;
        }
        $this->_removeGenerator($params['pObj']->content);
    }

    /**
     * Cached
     *
     * @return void
     */
    public function contentPostProcAll(&$params, &$that)
    {
        if ($GLOBALS['TSFE']->isINTincScript()) {
            return;
        }
        $this->_removeGenerator($params['pObj']->content);
    }

    /**
     * Remove generator meta tag
     * <meta name="generator" content="TYPO3 6.2 CMS">
     *
     * @return void
     */
    private function _removeGenerator(&$content)
    {
        $content = preg_replace('/<meta name="?generator"?.+?>/is', '', $content);
    }

}

ext_localconf.php

<?php

// hook is called after caching (for modification of pages with COA_/USER_INT objects)
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['contentPostProc-output'][] = 'Your\\Extension\\Namespace\\Hooks\\CleanSource->contentPostProcOutput';

// hook is called before caching (for modification of pages on their way in the cache)
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['contentPostProc-all'][] = 'Your\\Extension\\Namespace\\Hooks\\CleanSource->contentPostProcAll';