How to set PDF Document Settings
PdfDocumentBuilder builder = new PdfDocumentBuilder();
IPdfDocument doc = builder.CreateDocument();
IPdfPage page = doc.Pages.AddNew();
IPdfFont font = builder.FontFactory.CreateStandardFont(PdfStandardFontFamilies.Courier, 20);
IPdfBrush brush = builder.BrushFactory.CreateSolidBrush(new PdfColor(Color.Blue));
IPdfDocumentInformation info = doc.DocumentInformation;
info.Author = "Yanni";
info.CreationDate = DateTime.Now;
info.Creator = "Secret Garden";
info.Keywords = "Document Settings Demo";
info.Subject = "Document Settings";
info.Title = "Demo";
page.Graphics.DrawString("Press Ctrl+D to see document settings", font, brush, 20, 20);
doc.Save("TestDocumentSettings.pdf");
doc.Close();