SimplePie::get_copyright(): string|null

2925    public function get_copyright()2926    {2927        if ($return = $this->get_channel_tags(self::NAMESPACE_ATOM_10, 'rights')) {2928            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_10_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));2929        } elseif ($return = $this->get_channel_tags(self::NAMESPACE_ATOM_03, 'copyright')) {2930            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_03_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));2931        } elseif ($return = $this->get_channel_tags(self::NAMESPACE_RSS_20, 'copyright')) {2932            return $this->sanitize($return[0]['data'], self::CONSTRUCT_TEXT);2933        } elseif ($return = $this->get_channel_tags(self::NAMESPACE_DC_11, 'rights')) {2934            return $this->sanitize($return[0]['data'], self::CONSTRUCT_TEXT);2935        } elseif ($return = $this->get_channel_tags(self::NAMESPACE_DC_10, 'rights')) {2936            return $this->sanitize($return[0]['data'], self::CONSTRUCT_TEXT);2937        }2938 2939        return null;2940    }