I can use iText to digitally sign a document – ONCE.

IF I try to use iText to digitally sign a document for the 2^nd time, it breaks the first signature:

   Unexpected byte range values defining scope of signed data.

   Details: byte range of signature is invalid.

An obvious reason is the fact that iText inserts the signature at the beginning of the file, hence the existing signature is shifted down – and it’s ranges become invalid. And because ranges are part of the signature digest, they can not be changed (fixed).

Is there some way to tell iText to physically place the signature at the END of the file, pretty much like the Adobe Technical Note

“Digital Signatures in the PDF Language” suggests?