We are developing an application using java,springs and hibernate , we want add an watermark to word,excel and pdf documents before the document being downloaded. please let me know is their any free framework available to do this.
Just about any PDF library (like iText and PDFBox) can do this for PDFs. For Word and Excel it doesn't really make sense, since anyone could open the document and remove it. It would make sense for printing such a document, though.