public static void unwrap(final String sourcePdfFile) throws FileNotFoundException, IOException
    {
        if (StringUtils.isBlank(sourcePdfFile))
        {
            throw new IllegalArgumentException();
        }

        Path sourcePath = Paths.get(sourcePdfFile);
        if (Files.exists(sourcePath))
        {
            List<Path> listPdfFiles = null;

            if (Files.isDirectory(sourcePath))
            {
                listPdfFiles = MoreFiles.listPdfFiles(sourcePath);
            }
            else if (Files.isRegularFile(sourcePath))
            {
                listPdfFiles = new ArrayList<>(Arrays.asList(sourcePath));
            }
            else
            {
                System.err.println("Verzeichnis oder Datei existiert nicht: " + sourcePdfFile);
                return;
            }

            for (Path path : listPdfFiles)
            {
                System.out.println("Unwrap .. " + path.getFileName());
                LangUtils.removePDFHeader(path.toString());
                MoreFiles.renameFile(path.toString(), MoreFiles.removeExtension(path.toString(), "pdf"));
            }
        }
    }