PHP Extension

PDF Get Encryption and Permissions Information

See more PDF Signatures Examples

Determine if a PDF is encrypted, and the associated user permissions.

Note: Some PDFs are encrypted but not password-protected. In such cases, encryption is used primarily for preventing unauthorized modifications to the document, but it doesn't restrict access. Therefore, you can open and read the document without a password.

PHP Extension

<?php

include("chilkat.php");

$success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$pdf = new CkPdf();

// Load a PDF.
$success = $pdf->LoadFile('c:/someDir/sample.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

// Get information about the PDF that was collected in the call to LoadFile.
$ljd = new CkJsonObject();
$pdf->GetLastJsonData($ljd);

$ljd->put_EmitCompact(false);

print $ljd->emit() . "\n";

// Sample output:

// {
//   "pdfVersion": "1.6",
//   "encrypt": {
//     "filter": "/Standard",
//     "keyLength": 128,
//     "V": 4,
//     "R": 4,
//     "P": -1340,
//     "perm": {
//       "printLowResolution": "allowed",
//       "printHighResolution": "allowed",
//       "modifyOther": "not allowed",
//       "modifyAnnotations": "allowed",
//       "modifyForms": "not allowed",
//       "fillInForms": "allowed",
//       "assembleDoc": "allowed",
//       "extractAnyPurpose": "not allowed",
//       "extractAccessibility": "not allowed"
//     },
//     "method": "AESV2"
//   }
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

$pdfVersion = $ljd->stringOf('pdfVersion');
$Filter = $ljd->stringOf('encrypt.filter');
$KeyLength = $ljd->IntOf('encrypt.keyLength');
$V = $ljd->IntOf('encrypt.V');
$R = $ljd->IntOf('encrypt.R');
$P = $ljd->IntOf('encrypt.P');
$PrintLowResolution = $ljd->stringOf('encrypt.perm.printLowResolution');
$PrintHighResolution = $ljd->stringOf('encrypt.perm.printHighResolution');
$ModifyOther = $ljd->stringOf('encrypt.perm.modifyOther');
$ModifyAnnotations = $ljd->stringOf('encrypt.perm.modifyAnnotations');
$ModifyForms = $ljd->stringOf('encrypt.perm.modifyForms');
$FillInForms = $ljd->stringOf('encrypt.perm.fillInForms');
$AssembleDoc = $ljd->stringOf('encrypt.perm.assembleDoc');
$ExtractAnyPurpose = $ljd->stringOf('encrypt.perm.extractAnyPurpose');
$ExtractAccessibility = $ljd->stringOf('encrypt.perm.extractAccessibility');
$Method = $ljd->stringOf('encrypt.method');

?>