PdfStamper ignores pdfVersion

[wam23]

Hi,

I need to add a signature to an existing PDF document. I am using the
PdfStamper to create the signature.
So far this works. But I have problems with PDF version 1.2.

I tried to set the PDF version in the PdfStamper as following:
PdfStamper stp = PdfStamper.createSignature(reader, fout,
PdfWriter.VERSION_1_4, new File(
        "/temp"), true);

But the resulting PDF with the signature has always the same version
than the original file (version 1.2 in my case). It ignores the version
I specify in the method (PdfWriter.VERSION_1_4).

Full code:
    KeyStore ks = KeyStore.getInstance("pkcs12");
    ks.load(new FileInputStream("src/test/resources/thawtetest.p12"),
        "12345678".toCharArray());
    String alias = (String) ks.aliases().nextElement();
    PrivateKey key = (PrivateKey) ks.getKey(alias,
"12345678".toCharArray());
    Certificate[] chain = ks.getCertificateChain(alias);
    PdfReader reader = new PdfReader("src/test/resources/input12.pdf");
    FileOutputStream fout = new FileOutputStream("test.pdf");
    PdfStamper stp = PdfStamper.createSignature(reader, fout,
PdfWriter.VERSION_1_4, new File(
        "/temp"), true);
    PdfSignatureAppearance sap = stp.getSignatureAppearance();
    sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
    sap.setReason("I'm the author");
    sap.setLocation("Lisbon");
    sap.setAcro6Layers(true);
    // comment next line to have an invisible signature
    sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, null);
    stp.close();

Can anyone give me a hint how to set the PDF version of the output PDF?

Kind regards,
Rafael

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