Keep this in mind folks, it's ok to remove that from the footer, but you can NOT remove the copyright statements from the top of the php pages...that is a direct violation of the copyright.
Here is an example:
*------------------------------------------------------------------------------
$Id$
AbanteCart, Ideal OpenSource Ecommerce Solution
http://www.AbanteCart.com Copyright © 2011-2014 Belavier Commerce LLC
This source file is subject to Open Software License (OSL 3.0)
License details is bundled with this package in the file LICENSE.txt.
It is also available at this URL:
<http://www.opensource.org/licenses/OSL-3.0>
UPGRADE NOTE:
Do not edit or add to this file if you wish to upgrade AbanteCart to newer
versions in the future. If you wish to customize AbanteCart for your
needs please refer to
http://www.AbanteCart.com for more information.
------------------------------------------------------------------------------*/