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https://issues.apache.org/jira/browse/PDFBOX-2395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14168732#comment-14168732
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Robert Bielecki commented on PDFBOX-2395:
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Thanks for a quick fix. We will try test it with the next PDFBox release.
/Robert Bielecki
> Signing PDF document changes documentID
> ---------------------------------------
>
> Key: PDFBOX-2395
> URL: https://issues.apache.org/jira/browse/PDFBOX-2395
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel, Writing
> Affects Versions: 1.8.7
> Reporter: Robert Bielecki
> Assignee: Andreas Lehmkühler
> Fix For: 1.8.8, 2.0.0
>
>
> 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
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