Traditionally, hackers are people who like to explore the way technology works. Often, in the process, they come to question the way corporations and governments control computers -- or use technology to control people. This humanitarian, explorer spirit is what holds the hacker community together. It's what motivated Alan Bradley, one of Friday's late-night speakers, to deliver his entire talk via a VOIP phone whose data stream was double-cloaked with two software tools that hid the origin of his telephone call. "This is a proof of concept that demonstrates you can engage in completely anonymous public speech," his broadcast voice said. Everyone in the room listened to an empty podium (see photo at left) that contained only a computer while Bradley explained Tron, a tool that cloaks data stored in computer memory. It's also what motivated Hunz to give a talk called "Void the Warranty!" in which he encouraged people to open up "blackbox" technologies like printers and cell phones "because it's easy and fun."