One Copy

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => '_wp_attachment_copyright',
		'compare' => '!=',
	),
	array(
		'key'     => '_wp_attachment_copyright_url',
		'compare' => '!=',
	),
	array(
		'key'     => '_wp_attachment_source_name',
		'compare' => '!=',
	),
	array(
		'key'     => '_wp_attachment_source_url',
		'compare' => '!=',
	),
	array(
		'key'     => '_wp_attachment_source_reference',
		'compare' => '!=',
	),
);