Create a Certification Signature
With certification you can control if additional changes to the document are allowed after the signature was applied.
PHP
<?php
// load and register the autoload function
require_once __DIR__ . '/../../../../../bootstrap.php';
$certificationLevel = (int)displaySelect('Certification Level:', [
\SetaPDF_Signer::CERTIFICATION_LEVEL_NONE =>
'\SetaPDF_Signer::CERTIFICATION_LEVEL_NONE (default)',
\SetaPDF_Signer::CERTIFICATION_LEVEL_NO_CHANGES_ALLOWED =>
'\SetaPDF_Signer::CERTIFICATION_LEVEL_NO_CHANGES_ALLOWED',
\SetaPDF_Signer::CERTIFICATION_LEVEL_FORM_FILLING =>
'\SetaPDF_Signer::CERTIFICATION_LEVEL_FORM_FILLING',
\SetaPDF_Signer::CERTIFICATION_LEVEL_FORM_FILLING_AND_ANNOTATIONS =>
'\SetaPDF_Signer::CERTIFICATION_LEVEL_FORM_FILLING_AND_ANNOTATIONS'
], false);
$writer = new \SetaPDF_Core_Writer_Http('certified.pdf');
$document = \SetaPDF_Core_Document::loadByFilename(
$assetsDirectory . '/pdfs/camtown/Laboratory-Report.pdf',
$writer
);
// create a signer instance
$signer = new \SetaPDF_Signer($document);
// add a signature field
$field = $signer->addSignatureField();
// and define that you want to use this field
$signer->setSignatureFieldName($field->getQualifiedName());
// set the certification level
$signer->setCertificationLevel($certificationLevel);
$certificatePath = $assetsDirectory . '/certificates/setapdf-no-pw.pem';
// now create a signature module
$module = new \SetaPDF_Signer_Signature_Module_Pades();
// pass the path to the certificate
$module->setCertificate('file://' . $certificatePath);
// set the path to the private key (in this demo the key is also saved in the certificate file)
$module->setPrivateKey('file://' . $certificatePath, '');
// sign the document with the module
$signer->sign($module);