(Java) PDF Get Encryption and Permissions Information

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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.

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

    CkPdf pdf = new CkPdf();

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

    // Examine the LastJsonData
    CkJsonObject ljd = pdf.LastJsonData();
    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");
  }
}