Hi Oliver,
Oliver Brinzing wrote
you added a new file into the zip package *after* signing the document.
Yeah, thats correct.
Oliver Brinzing wrote
[...] LO checks all files inside the zip package during opening
and if it finds a changed file or a file which is not listed in
"documentsignatures.xml" it will
invalidate the signature. 
Perhaps. As a result, LibreOffice does not only use the XML signatures but
also checks additional things. Is that correct?
Regards
Steve
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