Am 12.05.2021 um 16:27 schrieb Ranjeet Kuruvilla:
https://apache.googlesource.com/pdfbox/+/trunk/examples/src/main/java/org/apache/pdfbox/examples/signature/ShowSignature.java
I am using 2.0.23 and Preflight 2.0.23.
It is possible to sign a document and then change a field (check or
uncheck a checkbox for example).
I want to either
a. make it impossible to change a value after even one signature has
been given
use certification signature ( SigUtils.setMDPPermission() ). While
saving incrementally will still be possible, Adobe will complain
(depending on the value used)
or
b. find out which field was altered after signature
If it is saved normally, then the signature verification will fail; if
you save incrementally, PDFBox can't tell, but Adobe will mention it.
Tilman
. How can I do that?
I do not think ShowSignature can do that.
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