-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
PDFTK also leaves the files unchanged, exactly as libreoffice does, another
possibilty
could be qpdf:
> andrew@a68n:~/Documents/SCAN$ qpdf --help
>
> Usage: qpdf [ options ] { infilename | --empty } [ outfilename ]
>
> An option summary appears below. Please see the documentation for details.
>
> Note that when contradictory options are provided, whichever options are
> provided last take precedence.
>
>
> Basic Options
> -------------
>
> --password=password specify a password for accessing encrypted files
> --linearize generated a linearized (web optimized) file
> --copy-encryption=file copy encryption parameters from specified file
> --encryption-file-password=password
> password used to open the file from which encryption
> parameters are being copied
> --encrypt options -- generate an encrypted file
> --decrypt remove any encryption on the file
> --pages options -- select specific pages from one or more files
>
> If none of --copy-encryption, --encrypt or --decrypt are given, qpdf will
> preserve any encryption data associated with a file.
>
> Note that when copying encryption parameters from another file, all
> parameters will be copied, including both user and owner passwords, even
> if the user password is used to open the other file. This works even if
> the owner password is not known.
>
>
> Encryption Options
> ------------------
>
> --encrypt user-password owner-password key-length flags --
>
> Note that -- terminates parsing of encryption flags.
>
> Either or both of the user password and the owner password may be
> empty strings.
>
> key-length may be 40, 128, or 256
>
> Additional flags are dependent upon key length.
>
> If 40:
>
> --print=[yn] allow printing
> --modify=[yn] allow document modification
> --extract=[yn] allow text/graphic extraction
> --annotate=[yn] allow comments and form fill-in and signing
>
> If 128:
>
> --accessibility=[yn] allow accessibility to visually impaired
> --extract=[yn] allow other text/graphic extraction
> --print=print-opt control printing access
> --modify=modify-opt control modify access
> --cleartext-metadata prevents encryption of metadata
> --use-aes=[yn] indicates whether to use AES encryption
> --force-V4 forces use of V=4 encryption handler
>
> If 256, options are the same as 128 with these exceptions:
> --force-V4 this option is not available with 256-bit keys
> --use-aes this option is always on with 256-bit keys
> --force-R5 forces use of deprecated R=5 encryption
>
> print-opt may be:
>
> full allow full printing
> low allow only low-resolution printing
> none disallow printing
>
> modify-opt may be:
>
> all allow full document modification
> annotate allow comment authoring and form operations
> form allow form field fill-in and signing
> assembly allow document assembly only
> none allow no modifications
>
> The default for each permission option is to be fully permissive.
>
> Specifying cleartext-metadata forces the PDF version to at least 1.5.
> Specifying use of AES forces the PDF version to at least 1.6. These
> options are both off by default.
>
> The --force-V4 flag forces the V=4 encryption handler introduced in PDF 1.5
> to be used even if not otherwise needed. This option is primarily useful
> for testing qpdf and has no other practical use.
>
>
> Page Selection Options
> ----------------------
>
> These options allow pages to be selected from one or more PDF files.
> Whatever file is given as the primary input file is used as the
> starting point, but its pages are replaced with pages as specified.
>
> --pages file [ --password=password ] [ page-range ] ... --
>
> For each file that pages should be taken from, specify the file, a
> password needed to open the file (if any), and a page range. The
> password needs to be given only once per file. If any of the input
> files are the same as the primary input file or the file used to copy
> encryption parameters (if specified), you do not need to repeat the
> password here. The same file can be repeated multiple times. All
> non-page data (info, outlines, page numbers, etc. are taken from the
> primary input file. To discard this, use --empty as the primary
> input.
>
> The page range is a set of numbers separated by commas, ranges of
> numbers separated dashes, or combinations of those. The character
> "z" represents the last page. Pages can appear in any order. Ranges
> can appear with a high number followed by a low number, which causes the
> pages to appear in reverse. Repeating a number will cause an error, but
> the manual discusses a workaround should you really want to include the
> same page twice.
>
> If the page range is omitted, the range of 1-z is assumed. qpdf decides
> that the page range is omitted if the range argument is either -- or a
> valid file name and not a valid range.
>
> See the manual for examples and a discussion of additional subtleties.
>
>
> Advanced Transformation Options
> -------------------------------
>
> These transformation options control fine points of how qpdf creates
> the output file. Mostly these are of use only to people who are very
> familiar with the PDF file format or who are PDF developers.
>
> --stream-data=option controls transformation of stream data (below)
> --normalize-content=[yn] enables or disables normalization of content streams
> --suppress-recovery prevents qpdf from attempting to recover damaged
> files
> --object-streams=mode controls handing of object streams
> --ignore-xref-streams tells qpdf to ignore any cross-reference streams
> --qdf turns on "QDF mode" (below)
> --min-version=version sets the minimum PDF version of the output file
> --force-version=version forces this to be the PDF version of the output file
>
> Version numbers may be expressed as major.minor.extension-level, so 1.7.3
> means PDF version 1.7 at extension level 3.
>
> Values for stream data options:
>
> compress recompress stream data when possible (default)
> preserve leave all stream data as is
> uncompress uncompress stream data when possible
>
> Values for object stream mode:
>
> preserve preserve original object streams (default)
> disable don't write any object streams
> generate use object streams wherever possible
>
> In qdf mode, by default, content normalization is turned on, and the
> stream data mode is set to uncompress.
>
> Setting the minimum PDF version of the output file may raise the version
> but will never lower it. Forcing the PDF version of the output file may
> set the PDF version to a lower value than actually allowed by the file's
> contents. You should only do this if you have no other possible way to
> open the file or if you know that the file definitely doesn't include
> features not supported later versions.
>
> Testing, Inspection, and Debugging Options
> ------------------------------------------
>
> These options can be useful for digging into PDF files or for use in
> automated test suites for software that uses the qpdf library.
>
> --static-id generate static /ID: FOR TESTING ONLY!
> --static-aes-iv use a static initialization vector for AES-CBC
> This is option is not secure! FOR TESTING ONLY!
> --no-original-object-ids suppress original object ID comments in qdf mode
> --show-encryption quickly show encryption parameters
> --check-linearization check file integrity and linearization status
> --show-linearization check and show all linearization data
> --show-xref show the contents of the cross-reference table
> --show-object=obj[,gen] show the contents of the given object
> --raw-stream-data show raw stream data instead of object contents
> --filtered-stream-data show filtered stream data instead of object contents
> --show-npages print the number of pages in the file
> --show-pages shows the object/generation number for each page
> --with-images also shows the object IDs for images on each page
> --check check file structure + encryption, linearization
>
> The --raw-stream-data and --filtered-stream-data options are ignored
> unless --show-object is given. Either of these options will cause the
> stream data to be written to standard output.
>
> If --filtered-stream-data is given and --normalize-content=y is also
> given, qpdf will attempt to normalize the stream data as if it is a
> page content stream. This attempt will be made even if it is not a
> page content stream, in which case it will produce unusable results.
>
> Ordinarily, qpdf exits with a status of 0 on success or a status of 2
> if any errors occurred. In --check mode, if there were warnings but not
> errors, qpdf exits with a status of 3.
>
Or possibly a combination of some of the following tools:
> andrew@a68n:~/Documents/SCAN$ apropos pdf
> dvipdf (1) - Convert TeX DVI file to PDF using ghostscript and dvips
> evince-thumbnailer (1) - create png thumbnails from PostScript and PDF
> documents
> fig2mpdf (1) - creation of multilayer pdf or eps figures from fig
> files using
> latex for typesetting fix-qdf (1) - repair PDF files in QDF form
> after editing
> foomatic-ppdfile (1) - Generate a PPD file for a given printer/driver combo
> ghostscript (1) - Ghostscript (PostScript and PDF language interpreter
> and
> previewer) gs (1) - Ghostscript (PostScript and PDF language
> interpreter
> and previewer) gsnd (1) - Run ghostscript (PostScript and PDF
> engine)
> without display htdig-pdfparser (1) - parse a PDF document (wrapper script
> for htdig)
> Image::ExifTool::PDF (3pm) - Read PDF meta information
> Image::ExifTool::WritePDF (3pm) - Write PDF meta information
> Mail::SpamAssassin::Plugin::PDFInfo (3pm) - PDFInfo Plugin for SpamAssassin
> mupdf (1) - MuPDF is a lightweight PDF viewer written in portable C
> mupdf-x11 (1) - MuPDF is a lightweight PDF viewer written in portable C
> pdf-meta (1) - read and write metadata from a PDF file
> pdf2dsc (1) - generate a PostScript page list of a PDF document
> pdf2ps (1) - Ghostscript PDF to PostScript translator
> pdfdetach (1) - Portable Document Format (PDF) document embedded file
> extractor
> (version 3.03) pdffonts (1) - Portable Document Format (PDF) font
> analyzer
> (version 3.03) pdfimages (1) - Portable Document Format (PDF) image
> extractor
> (version 3.03) pdfinfo (1) - Portable Document Format (PDF) document
> information extractor (version 3.03) pdfopt (1) - Ghostscript PDF
> Optimizer
> pdfseparate (1) - Portable Document Format (PDF) page extractor
> pdftexi2dvi (1) - convert Texinfo documents to DVI or PDF
> pdftk (1) - A handy tool for manipulating PDF
> pdftocairo (1) - Portable Document Format (PDF) to
> PNG/JPEG/TIFF/PDF/PS/EPS/SVG
> using cairo pdftohtml (1) - program to convert PDF files into HTML,
> XML and PNG
> images pdftoppm (1) - Portable Document Format (PDF) to Portable
> Pixmap (PPM)
> converter (version 3.03) pdftops (1) - Portable Document Format
> (PDF) to
> PostScript converter (version 3.03) pdftotext (1) - Portable Document
> Format
> (PDF) to text converter (version 3.03) pdfunite (1) - Portable
> Document Format
> (PDF) page merger ps2ascii (1) - Ghostscript translator from
> PostScript or PDF
> to ASCII ps2pdf (1) - Convert PostScript to PDF using ghostscript
> ps2pdf12 (1) - Convert PostScript to PDF 1.2 (Acrobat 3-and-later
> compatible)
> using ghostscript ps2pdf13 (1) - Convert PostScript to PDF 1.3
> (Acrobat
> 4-and-later compatible) using ghostscript ps2pdf14 (1) - Convert
> PostScript to
> PDF 1.4 (Acrobat 5-and-later compatible) using ghostscript ps2pdfwr (1)
> -
> Convert PostScript to PDF without specifying CompatibilityLevel, using
> ghostscript
> pstoedit (1) - a tool converting PostScript and PDF files into
> various vector
> graphic formats pstotext (1) - extract ASCII text from a PostScript
> or PDF file
> qpdf (1) - PDF transformation software texi2dvi (1) -
> convert
> Texinfo documents to DVI or PDF texi2pdf (1) - convert Texinfo
> documents to DVI
> or PDF
Cannot go less mousey yet concerning this, it's kind of beyond my scope and too
expensive
right now, I mean time-consuming, so currently there is no alternative to the
libreoffice-downgrade.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
iEYEARECAAYFAlgCYDUACgkQ5+rBHyUt5wt4owCeI2Ph/LaGdQUhHV6vyAHYZPW5
8RoAoL7fN9VJC6omeuLyJvhbui4iqvRD
=QAoP
-----END PGP SIGNATURE-----
