To properly convert some PDF files in CJK (Chinese, Japanese, Korean)
languages, the poppler-data_ package has to be installed.

.. _poppler-data:
   http://poppler.freedesktop.org/poppler-data-0.4.7.tar.gz

For the Windows port:

- unpack the archive;
- rename the extracted directory to ``poppler-data``;
- put it into the same directory as the ``pdf2djvu.exe`` file.

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