[Libreoffice-bugs] [Bug 66580] exported PDF is invalid because of forbidden custom keys in the trailer

[bugzilla-daemon at bugs.documentfoundation.org]

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

--- Comment #10 from kurt.pfeifle at gmail.com ---
(In reply to Jos van den Oever from comment #9)
> PDF documents created with version 5.1.2.2.0 on Linux 4.4 still add the key
> /DocChecksum and /AdditionalStreams to the PDF files.

Jos, the additional (proprietary) keys used by OpenOffice/LibreOffice to embed
the original OpenDocument file into the Hybrid PDF are not doing any real
h a r m:

  * As I showed in comment #6 none of the 36 tested PDF viewers has any problem
    opening and displaying a Hybrid PDF!

There are other reasons which would may  M E  want to modify the way LO creates
a Hybrid PDF:

  * N O N E  of the other PDF readers do have a way to detect that there is an
    embedded OpenDocument file in the PDF!

The reason for this is that the way OO/LO implemented this feature was that
they did it in a non-standard, "proprietary" way -- while they could have
utilized the standards-defined "embed another file into the PDF"-feature. (See
for example bug95328 and comments).

And there  A R E  good use cases to be able to detect the embeddedness of the
original OpenDocument file in a PDF even by non-OO/LO applications:

  - User(s) may not be aware of this when they open the PDF in a PDF reader.
    However, the reader may draw their attention to the fact of the original
    ODT/ODS document being embedded. After all, whoever embedded the original
    document into the Hybrid PDF most likely  W A N T E D  it to be editable.

  - Users may need/want to extract the embedded ODT/ODS file without switching 
    to LibreOffice first (which may not even be installed on their currently
    used computer system).

  - I could easily think of more use cases, why it would be good to be able to
    D E T E C T  the fact of the embedded original and editable file and also
    to  E X T R A C T  it from the PDF via a software other than OO/LO.

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