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iText: password protect a signed pdf file

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hello friend ,

i had written a code to digitally sign a pdf document using itext jar. Once digitally signed ,signature is validated and present in all the pdf pages.

now thing is i am password protecting the pdf in which input i am giving it as signed pdf document ... once i open with the password ,signature is becoming invalid . I think since its getting protected its not able to find the PKC and keystore where i have placed it in the folder where my program is written .
Please could anyone help me out .

-->PdfEncryptor.encrypt(reader,new FileOutputStream("encrypted.pdf"),"Hello".getBytes(),"World".getBytes(),PdfWriter.AllowPrinting | PdfWriter.AllowCopy,false);
He was giving me directions and I was powerless to resist. I cannot resist this tiny ad:
SKIP - a book about connecting industrious people with elderly land owners
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