如何使用 iTextSharp for C# 设置现有 PDF 的版权元数据

Question

如何使用 iTextSharp for C# 设置现有（即从文件或内存流加载的 pdf）pdf 文件的版权元数据？

非常感谢

Answer 1

原生 XMP 结构没有实现版权（或者至少它们没有以 Adob​​e Reader 识别的方式。）为此，您可以对 Adob​​e 踢出的内容进行逆向工程并手动编写：

        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();

                }
            }
        }