you can also go into the includes/version.php and edit the following section of code to include whatever you want.

var $URL     = ‘<a href=”http://www.joomla.org”>Joomla!</a> is Free Software released under the GNU/GPL License.’;

底部版权一般情况都在footer.php 或 version.php里面，有的时候模版文件index.php里面也有.
去掉meta：
修改/includes/frontend.php
找到

$mainframe->addMetaTag( ‘Generator’, $_VERSION->PRODUCT . ‘ – ‘ . $_VERSION->COPYRIGHT);

屏蔽掉就行了

//$mainframe->addMetaTag( ‘Generator’, $_VERSION->PRODUCT . ‘ – ‘ . $_VERSION->COPYRIGHT);

感谢Autoit大大！