In 2008, the Massachusetts Bay Transportation Authority (MBTA) obtained a temporary restraining order barring three Massachusetts Institute of Technology students from showing what they claimed to be a way to get "free subway rides for life." The 10-day injunction prohibited the students from revealing vulnerabilities of the MBTA's fare card. The students were scheduled to present their findings in Las Vegas at the Defcon computer hacking conference. Are the students' actions legal? Are their actions ethical? Discuss your answer from the perspective of the students and then from the perspective of the MBTA.