Modify Software Licensing License Structure

// Prepend/append text to license keys

function custom_edd_license_usernam_date_md5( $key, $license_id, $download_id, $payment_id, $cart_index ) {

	$prepend   = 'prepend';

	$license   = md5( $license_id );

	$append    = 'append';

	$key       = $prepend . '_' . $license . '_' . $append;

	return $key;

}

add_filter( 'edd_sl_generate_license_key', 'custom_edd_license_usernam_date_md5', 10, 5 );