I can set the local OS signedData on the Signature Appearance's layer 2.
To put the token date, I need to know the location of the layer and put it
into the ByteRange.
Then I can exclude the layer for time stamping and set the token date on the
layer after receiving token.
There is a exclusions variable in PdfSignatureAppearance class like below.
exclusionLocations.put(PdfName.BYTERANGE, lit);
But the layer is written after all the exclusionLocations is put.
I am going to change the itext source.
Any help would be appreciated.
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