protected static String createSubsetPrefix(){
  StringBuilder s=new StringBuilder("");
  for (int k=0; k < 6; ++k) {
    s.append((char)(Math.random() * 26 + 'A'));
  }
  return s + "+";
}

protected static String createSubsetPrefix ( ) { StringBuilder s = new StringBuilder ( "" ) ; for ( int k = 0 ; k < 6 ; ++ k ) { s . append ( ( char ) ( Math . random ( ) * 26 + 'A' ) ) ; } return s + "+" ; }
creates a unique subset prefix to be added to the font name when the font is embedded and subset .
