How to set metadata metadata of an existing PDF using iTextSharp for C #

Question

How can I set copyright metadata to an existing (i.e. pdf file downloaded from a file or data stream) pdf file using iTextSharp for C #?

thanks a lot

Answer 1

XMP's own structures do not have copyright (or at least they are not recognized by Adobe Reader.) To do this, you can reverse engineer what Adobe will release and write manually:

String inputPDF = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Services.pdf"); String outputPDF = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Services_Out.pdf"); PdfReader reader = new PdfReader(inputPDF); using (FileStream fs = new FileStream(outputPDF, FileMode.Create, FileAccess.Write, FileShare.Read)) { using (PdfStamper stamper = new PdfStamper(reader, fs)) { using (MemoryStream ms = new MemoryStream()) { string CopyrightName = "YOUR NAME HERE"; string CopyrightUrl = "http://www.example.com/"; XmpWriter xmp = new XmpWriter(ms); xmp.AddRdfDescription("xmlns:dc=\"http://purl.org/dc/elements/1.1/\"", String.Format("<dc:rights><rdf:Alt><rdf:li xml:lang=\"x-default\">{0}</rdf:li></rdf:Alt></dc:rights>", CopyrightName)); xmp.AddRdfDescription("xmlns:xmpRights=\"http://ns.adobe.com/xap/1.0/rights/\"", string.Format("<xmpRights:Marked>True</xmpRights:Marked><xmpRights:WebStatement>{0}</xmpRights:WebStatement>", CopyrightUrl)); xmp.Close(); stamper.XmpMetadata = ms.ToArray(); stamper.Close(); } } }