Robert Bielecki created PDFBOX-2395:
---------------------------------------
Summary: Signing PDF document changes documentID
Key: PDFBOX-2395
URL: https://issues.apache.org/jira/browse/PDFBOX-2395
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 1.8.7
Reporter: Robert Bielecki
When I invoke the method #setDocumentId(...) on PDDocument the document id
changes completely.
Following the standard:
Every PDF document should have an ID array in the file trailer. From the PDF
1.7 Reference, "TABLE 3.13 Entries in the file trailer dictionary":
"ID array (Optional, but strongly recommended; PDF 1.1) An array of two
byte-strings constituting a file identifier (see Section 10.3, “File
Identifiers”) for the file. ..."
In section "10.3 File Identifiers" it says:
"File identifiers are defined by the optional ID entry in a PDF file’s trailer
dictionary (see Section 3.4.4, “File Trailer”; see also implementation note 162
in Appendix H). The value of this entry is an array of two byte strings. The
first byte string is a permanent identifier based on the contents of the file
at the time it was originally created and does not change when the file is
incrementally updated. The second byte string is a changing identifier based on
the file’s contents at the time it was last updated."
See original issue:
https://joinup.ec.europa.eu/asset/sd-dss/issue/signing-pdf-document-sd-dss-changes-id-string
So if I understand well only the second element must change. Please could you
provide me with your understanding of the problem.
Thanks / Bob
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
