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Warn you before printing the document

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.PdfAction; import com.lowagie.text.pdf.PdfContentByte; import com.lowagie.text.pdf.PdfDestination; import com.lowagie.text.pdf.PdfWriter; public class MainClass {   public static void main(String[] args) throws Exception {     Document document = new Document();     PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));     document.open();     document.add(new Paragraph("test."));     PdfAction copyrightNotice = PdfAction.javaScript(         "app.alert('Warning: this document is protected by copyright.');\r", writer);     writer.setAdditionalAction(PdfWriter.WILL_PRINT, copyrightNotice);          document.close();   } }