Joomla: delete the copyright portion

How do i remove the bit on the bottom of my website that says "Powered by Joomla!. Valid XHTML and CSS."?

This also comes up when i have the "Footer" published on the website. Then i have an extra copyright that says "Joomla! is Free Software released under the GNU/GPL License."
How do I remove it?

First:

Go to the root fold Of Joomla >> languages >>en-GB/ en-GB.mod_footer.ini || modify it there.

FOOTER=Footer
FOOTER_LINE1=Copyright © %date% %sitename%. All Rights Reserved.
FOOTER_LINE2=Joomla! is Free Software released under the GNU/GPL License.
MOD_FOOTER=mod_footer
THIS MODULE SHOWS THE JOOMLA! COPYRIGHT INFORMATION=This Module shows the Joomla! Copyright information

Second:

Go to yourtemplate/index.php >> bottom of page || change it there.

Joomla!.
XHTML CSS

http://www.wzcreativetechnology.com/joomla/joomla-tips-and-tricks/57-how-to-remove-joomla-15-copyright-info.html