(Node.js) 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.

Note: This example requires Chilkat v9.5.0.96 or later.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var pdf = new chilkat.Pdf();

    // Open a PDF.
    // Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions.
    var success = pdf.LoadFile("c:/someDir/sample.pdf");
    if (success == false) {
        console.log(pdf.LastErrorText);
        return;
    }

    // Examine the LastJsonData
    // ljd: JsonObject
    var ljd = pdf.LastJsonData();
    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");

}

chilkatExample();