Hi Steve, you added a new file into the zip package *after* signing the document. I *guess* (did not check the source code) 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. Regards Oliver _______________________________________________ LibreOffice mailing list LibreOffice@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/libreoffice