With more than $400 million in projected gross sales for 2011, Eventbrite is getting big enough that it has to worry about fending off the criminals. In the above clip of Founder Stories with Chris Dixon , Julia Hartz discusses Eventbrites' digital shield, while her partner in crime Kevin Hartz describes a new box-office iPad app the ticketing site recently rolled out. The husband and wife team also discuss, well, being a husband and wife team. Says Juila, "We learned a really valuable lesson early on from Michael and Xochi Burch who funded Bebo ... they said divide and conquer, never work on the same project at the same time. We have actually followed that to a tee for the last five years."