It belongs to the footer module of template, you can change these text via language file of this footer module: root/language/en-GB/en-GB.mod_footer.ini
Look for this line:
MOD_FOOTER_LINE2="<a href="_QQ_"https://www.joomla.org"_QQ_">Joomla!</a> is Free Software released under the <a href="_QQ_"https://www.gnu.org/licenses/gpl-2.0.html"_QQ_">GNU General Public License.</a>"
If you don’t want to use this, just change it to: MOD_FOOTER_LINE2 = " "
1 user says Thank You to Saguaros for this useful post