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2007-10-02 - By webtom

Back

Hi,

i try to implement the following steps:
1) reading a signed pdf
2) adding a javascript code to the pdf and
3) printing the pdf to the default printer.

...
try {
PdfReader reader = new PdfReader(pdfByteArray); //pdfByteArray represents
the content of pdf file
PdfStamper stamper = new PdfStamper(reader, outputStream);
stamper.addJavaScript("this.print(false);");
stamper.close();
} catch (Exception e) {...}
...

After executing the java code the signed document is printed but the
signature is not valid. If i don't add the javascript code the pdf is
displayed by acrobat reader within the browser but the signature is also
invalid! (Error message: byte range of the signature is not valid.)

My questions:
1) How is it possible to read a signed pdf document without destroying the
signature?
2) Is there a possibility to add javascript code so that the signature keeps
valid?

Thanks for your hints,
Tom
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