如何使用iText仅将用户密码而不将所有者密码添加到PDF

Question

How to add only user password to the pdf file without adding the owner password using iText? As far as I can see, seems only can do this by adding an user password along with an owner password.

Answer 1

Encrypting an existing PDF is done like this:

public void encryptPdf(String src, String dest) throws IOException, DocumentException {
    PdfReader reader = new PdfReader(src);
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
    stamper.setEncryption(USER, OWNER,
    PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128 | PdfWriter.DO_NOT_ENCRYPT_METADATA);
    stamper.close();
    reader.close();
}

See http://itextpdf.com/examples/iia.php?id=219

If OWNER is null , then a random owner password will be generated (one that nobody knows). Maybe that's what your customer means. As mkl already explained, it doesn't really make sense to have a PDF with a USER password, but without an OWNER password.

Answer 2

The following code is what you need to add the owner password.

  JRPdfExporter exporter = new JRPdfExporter();       
  exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperprintobj);
  exporter.setParameter(JRExporterParameter.OUTPUT_FILE,new File(fileName));
  exporter.setParameter(JRPdfExporterParameter.IS_ENCRYPTED, Boolean.TRUE);
  exporter.setParameter(JRPdfExporterParameter.IS_128_BIT_KEY, Boolean.TRUE);
  //exporter.setParameter(JRPdfExporterParameter.USER_PASSWORD, "jasper");
  exporter.setParameter(JRPdfExporterParameter.OWNER_PASSWORD, "reports");
  exporter.setParameter(
    JRPdfExporterParameter.PERMISSIONS, 
    new Integer(PdfWriter.ALLOW_COPY | PdfWriter.ALLOW_PRINTING)
    );
  exporter.exportReport(); // finally export as pdf

Use this code in java where you generate the pdf.