I found function _e documented at
http://codex.wordpress.org/Function_Reference/_e
It's a translation function.
I had misread ©, it is the HTML code for (c), so by changing the string 'Copyright' and deleting the (c) symbol, I have what I want. I should probably have replaced the _e function with an echo but I didn't.
I have done this as advised, in a child theme folder.
Thanks to Clayton and YPyogi