Java

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.

Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

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

    CkPdf pdf = new CkPdf();

    //  Load a PDF.
    success = pdf.LoadFile("c:/someDir/sample.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

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

    ljd.put_EmitCompact(false);

    System.out.println(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

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