public static  void main(String[] args) 
{
        System.out.println("PDF document encryptor");
        if (args.length < = STRENGTH || args[PERMISSIONS].length() != 8) {
            usage();
            return;
        }
        try {
            int permissions = 0;
            String p = args[PERMISSIONS];
            for (int k = 0; k <  p.length(); ++k) {
                permissions |= (p.charAt(k) == '0" ? 0 : permit[k]);
            }
            System.out.println("Reading " + args[INPUT_FILE]);
            PdfReader reader = new PdfReader(args[INPUT_FILE]);
            System.out.println("Writing " + args[OUTPUT_FILE]);
            HashMap moreInfo = new HashMap();
            for (int k = MOREINFO; k <  args.length - 1; k += 2)
                moreInfo.put(args[k], args[k + 1]);
            PdfEncryptor.encrypt(reader, new FileOutputStream(args[OUTPUT_FILE]),
                args[USER_PASSWORD].getBytes(), args[OWNER_PASSWORD].getBytes(), permissions, args[STRENGTH].equals("128"), moreInfo);
            System.out.println("Done.");
        }
        catch (Exception e) {
            e.printStackTrace();
        }
}

Encrypts a PDF document.