Antonios Papadakis-Pesaresi wrote: > Hello, > > I'm interested in a quick and fast way of watermarking existing pdf files.
That's easy. http://itextdocs.lowagie.com/tutorial/general/copystamp/#pdfstamper > The main thing that I am going to need is to add an invisible watermark That's odd. What's the point of adding an invisible watermark? > (like a transaction ID) to a pdf file, Does every page need this ID or is adding the ID to the PDF file sufficient? > and later I will need a way to retrieve the watermark from the pdf file. That may turn out to be very difficult if you choose to add a watermark. If you want to retrieve the 'hidden' data, why not use an annotation? Or why not add the ID as metadata? I think the question "how to add a watermark?" is irrelevant for the requirement "how to add an invisible ID to a PDF file that can be retrieved afterwards?" Please give it another thought before you start coding. br, Bruno ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
