Android™ Requires Chilkat v11.7.0+

Remove the Password and Encryption from a PDF

See more PDF Protection Examples

Demonstrates the removeEncryption operation, which saves the PDF with no encryption at all: no password, no restrictions. It needs owner rights, so the PDF is loaded with its owner password. As with every Protection operation, the change is applied when the file is written. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

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

    //  The PDF used in this example is available at encrypted_user_password.pdf

    CkPdf pdf = new CkPdf();

    //  Removing the encryption needs owner rights: load with the owner password.
    pdf.put_OwnerPassword("owner-secret");
    success = pdf.LoadFile("qa_data/pdf/encrypted_user_password.pdf");
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    CkJsonObject json = new CkJsonObject();
    CkJsonObject jsonOut = new CkJsonObject();
    success = pdf.Protection("getInfo",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "encrypted, as loaded: " + String.valueOf(jsonOut.BoolOf("loaded.encrypted")));
    Log.i(TAG, "algorithm: " + jsonOut.stringOf("loaded.algorithm"));

    success = pdf.Protection("removeEncryption",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "will be saved encrypted: " + String.valueOf(jsonOut.BoolOf("pending.encrypted")));

    success = pdf.WriteFile("qa_output/minutes_unprotected.pdf");
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    //  The result is an ordinary PDF that opens without a password.
    CkPdf reader = new CkPdf();
    CkJsonObject info = new CkJsonObject();
    success = reader.PreLoadCheck("qa_output/minutes_unprotected.pdf",info);
    if (success == false) {
        Log.i(TAG, reader.lastErrorText());
        return;
        }

    Log.i(TAG, "encrypted: " + String.valueOf(info.BoolOf("encrypted")));
    success = reader.LoadFile("qa_output/minutes_unprotected.pdf");
    if (success == false) {
        Log.i(TAG, reader.lastErrorText());
        return;
        }

    Log.i(TAG, "pages: " + String.valueOf(reader.get_NumPages()));

    //  Sample output:

    //  encrypted, as loaded: True
    //  algorithm: rc4-128
    //  will be saved encrypted: False
    //  encrypted: False
    //  pages: 1

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}