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Example 1: Sign a PDF file with an invisible signature (Delphi)  

   uses ComObj;

   procedure TForm1.Button1Click(Sender: TObject);
     NVsign : Variant;
     retVal : Integer;
     NVsign := CreateOleObject('Neevia.PDFsign');
     NVsign.CertificateSubject := 'Test certificate';
     NVsign.CertificatePassword := 'password';

     NVsign.Reason := 'I am the creator of this document';

     NVsign.Invisible := true;
     retVal := NVsign.SignPDF('c:\in.pdf', 'c:\out.pdf');
     if retVal <> 0 then
       Application.MessageBox(PChar('Error code=' + IntToStr(retVal)),'',0)

I was looking for a product that could place watermarks on very large PDF files (some of them over 30 thousand pages) in as less time as possible. After testing many tools I found Neevia PDFstamp. It did the job!

Avi Steinman

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