https://bugs.documentfoundation.org/show_bug.cgi?id=121133
--- Comment #20 from Michal Bozon <[email protected]> ---
I have the same problem. Signed PDF document exported by LibreOffice (Writer)
signature seems to be OK when verified e.g. by poppler pdfsig utility. However
Adobe Reader (used to make sure the exported document is correct for mainstream
users utilizing mainstream apps, or rather correct then opened in THE PDF
reader app) successfully verifies the signature, but claims that the document
was modified after signing. This does not happen e.g. for some randomly chosen
PDF document released and signed by the (our) government.
The problem is unaffected by changing "normal" to archive PDF/A (either 2b or
1b) PDF export option (other options left default).
LiberOffice version: 6.4.3.2 (build 6.4.3-1) (but it's a long-term problem, the
same problem was months or years ago)
Adobe Reader version: 11.0.10 (for Windows, running in Wine)
OS: Arch linux
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