coolgearguy on "Twenty Thirteen Footer Theme Edit in Error"

Tried to write my Copyright Info with a link to my Terms Of Use in the Footer section of the Twenty Thirteen Theme by replacing the "Powered by WordPress". Worked fine in the Twenty Twelve Theme but has thrown up an error in this which has also lost a widget I had in the footer section (i.e. main widget area for the Twenty Thirteen Theme). I have now tried to edit it back to the original "Powered by WordPress" script but must be missing something because it's still in error. Here's the script where I made the changes. Please check your Twenty Thirteen Theme and let me know where it's in error. Thanks!
<!-- Edited Here -->
" title="<?php esc_attr_e( 'Semantic Personal Publishing Platform', 'twentythirteen' ); ?>"><?php printf( __( 'Proudly Powered by %s', 'twentythirteen' ), 'WordPress' ); ?>
</div><!-- .site-info -->