JavaScript

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.

JavaScript

var success = false;

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

var pdf = new CkPdf();

// Load a PDF.
success = pdf.LoadFile("c:/someDir/sample.pdf");
if (success == false) {
    console.log(pdf.LastErrorText);
    return;
}

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

ljd.EmitCompact = false;

console.log(ljd.Emit());

// 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

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