[Update since Divi 4.0 release: The post below was a method utilised before the release of Divi 4.0 with the Theme Builder. But now, there's no need for any code when you need a custom footer layout. Click here for instructions on how to implement a custom footer...
PHP
How to add a footer.php file to your Divi child theme
Haven't created your Divi child theme yet? Do this first: How to create a Divi child theme in simple steps (stylesheet only) Step 1: Log in to your website’s cpanel and click open the “File Manager”. You could also access your site files via FTP (File Transfer...
Use [copy] and [year] shortcodes in your Divi custom footer text
Want to include shortcodes in your Divi theme custom footer text? Using a shortcode for the year means the year will always be current and up-to-date without requiring manual edits. Click here for instructions to simply rewrite the default Divi footer text into custom...