What are the best practices for setting permissions on a PDF file to prevent future changes using pdflib in PHP?

To prevent future changes to a PDF file, you can set permissions using pdflib in PHP. This can include restricting editing, printing, copying text, and more. By setting these permissions, you can ensure that the PDF file remains secure and cannot be modified without proper authorization. 

$pdf = new PDFlib();

if ($pdf->begin_document("example.pdf", "") == 0) {
    die("Error: " . $pdf->get_errmsg());
}

// Set permissions to prevent changes
$pdf->set_option("permissions=print=no");
$pdf->set_option("permissions=modify=no");
$pdf->set_option("permissions=copy=no");

$pdf->end_document();
$pdf->delete();

Keywords

pdflib PHP permissions PDF file prevent changes

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