https://bugs.freedesktop.org/show_bug.cgi?id=66580

          Priority: medium
            Bug ID: 66580
          Assignee: [email protected]
           Summary: exported PDF is invalid
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: [email protected]
          Hardware: Other
            Status: UNCONFIRMED
           Version: 4.1.0.0.beta2
         Component: Libreoffice
           Product: LibreOffice

PDF exported by LibreOffice contains the key /DocChecksum in the trailer
dictionary. When an ODF document is embedded, it also contains the key
/AdditionalStreams.

These keys are not defined in the PDF 1.4 specification. The specification
forbids use of custom keys in the trailer:

===
A PDF producer or Acrobat plug-in extension may also add keys to any PDF
object that is implemented as a dictionary, except the file trailer dictionary
(see Section 3.4.4, “File Trailer”). In addition, a PDF producer or Acrobat
plug-in may create tags that indicate the role of marked-content operators (PDF
1.2), as described in Section 9.5, “Marked Content.”
===

A strict PDF validator would declare PDF documents saved by LibreOffice
invalid.

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