protected function getLicenseAttribution( $html ) {
		$meta = [];

		// get license attribution statement if it exists
		preg_match( '/(?:<div class="license-attribution[^>]*>)(.*)(<\/div>)/isU', $html, $matches );

		if ( ! empty( $matches[1] ) ) {
			$html5 = new HtmlParser();
			$dom = $html5->loadHTML( $matches[1] );
			$meta = $this->scrapeAndKneadMeta( $dom );
		}
		return $meta;
	}