Remove GNU/GPL Licence?

If you want removing "Joomla! is Free Software released under the GNU/GPL License." at the footer of each page, the steps are :

Reguler Mode
1. Go to Extensions -> Module Manager -> Footer -> Unpublish
* for administrator page, go to administration tab


Syntax Mode
1. Go to the language folder
2. open en-GB.mod_footer.ini file
3. Replace the text as below for footer_line1 and footer_line2
FOOTER_LINE1=Copyright © %date% %sitename%. All Rights Reserved.
FOOTER_LINE2=

note : keep "FOOTER_LINE2=" as blank