Universal Hub points out that three MIT students who hacked the Charlie Card system are scheduled to give a presentation at Defcon tomorrow about how they went about it. The T, while not interested in its hearing about security problems when the students first brought them to the authority, has now filed a lawsuit designed to stop the MIT students from presenting their findings at Defcon. The students insist they will not reveal information specifically targeted at hacking the CharlieCard, and the Register points out that Charlie-style RFID cards were hacked a while ago, anyway. We think the T needlessly exacerbated this situation with a lawsuit, and wouldn't be surprised if many MIT students somehow start riding for free.