Hello,
The conversion plugin doesn't include options to change those security settings when generating a PDF.
Premium licenses include a CryptoAPI module to encrypt and protect DOCX, PDF, XLSX and PPTX files. For example, you can use protectPDF (https://www.phpdocx.com/api-documentation/cryptophpdocx/protect-pdf-document-with-PHP) to handle PDF security settings:
$pdf->protectPDF($source, $target, array('permissionsBlocked' => array('print', 'modify', 'copy', 'annot-forms', 'fill-forms', 'extract', 'assemble', 'print-high')));
Regards.