The same problem exists in 5.4.1 version.
in I text if you want to have multiple signature you must create stamper
like this
PdfStamper stp = PdfStamper.CreateSignature(reader, output, '\0',null,
true);
but
stp.SetEncryption(chain, new int[] { PdfWriter.ALLOW_FILL_IN },
PdfWriter.ENCRYPTION_AES_128);
this code give an exception "append.mode.does.not support.changing.the
encryption.status"
so what I want is encrypt a pdf for one person and and also sign it for two
different person
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