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

or

b. find out which field was altered after signature

. How can I do that?

I do not think ShowSignature can do that.


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