People of dafont! This is a (somewhat poorly) digitally rendered version of a typeface called Bifur that was designed in 1929 by A. M. Cassandre. Because Klein named this font 'Cassandra', I don't think he is intending to present it as his own original design, but nonetheless he is not the one to ask for permission for use in commercial projects, as he has merely copied the design from elsewhere.
There are several versions of this font floating around the web, some free, some not, and dafont even has another version that is much closer to the original design (and much more beautiful, imo). http://www.dafont.com/bifur.font