> It uses all the bytes that will be used in signing.

I can understand that. But I need to know which bytes (or rather which
byte ranges) exactly.

> Why do you need to know it?

To calculate the document hash in an external application that does
not use iText.

It looks like the first tuple (x1, x2) in the /ByteRange [x1, x2, x3,
x4] could contain the byte range, but it includes the obj and
<</Contents bytes as well so I would like to get some first-hand
advice on getting to the range.

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