Lazarus Pascal 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. Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Pdf,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  pdf: TPdf;
  json: TJsonObject;
  jsonOut: TJsonObject;
  reader: TPdf;
  info: TJsonObject;

begin
  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

  pdf := TPdf.Create;

  //  Removing the encryption needs owner rights: load with the owner password.
  pdf.OwnerPassword := 'owner-secret';
  success := pdf.LoadFile('qa_data/pdf/encrypted_user_password.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  json := TJsonObject.Create;
  jsonOut := TJsonObject.Create;
  success := pdf.Protection('getInfo',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn('encrypted, as loaded: ' + jsonOut.BoolOf('loaded.encrypted'));
  WriteLn('algorithm: ' + jsonOut.StringOf('loaded.algorithm'));

  success := pdf.Protection('removeEncryption',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn('will be saved encrypted: ' + jsonOut.BoolOf('pending.encrypted'));

  success := pdf.WriteFile('qa_output/minutes_unprotected.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  //  The result is an ordinary PDF that opens without a password.
  reader := TPdf.Create;
  info := TJsonObject.Create;
  success := reader.PreLoadCheck('qa_output/minutes_unprotected.pdf',info);
  if (success = False) then
    begin
      WriteLn(reader.LastErrorText);
      Exit;
    end;
  WriteLn('encrypted: ' + info.BoolOf('encrypted'));
  success := reader.LoadFile('qa_output/minutes_unprotected.pdf');
  if (success = False) then
    begin
      WriteLn(reader.LastErrorText);
      Exit;
    end;
  WriteLn('pages: ' + reader.NumPages);

  //  Sample output:

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


  pdf.Free;
  json.Free;
  jsonOut.Free;
  reader.Free;
  info.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.