A federal judge on Saturday gagged three Massachusetts Institute of Technology undergraduates from publicly presenting research at Defcon demonstrating gaping holes in the electronic payment systems of one of the nation's biggest transit agencies.
The US Court system continues to demonstrate that they have no respect for the right to freedom of speech when the interests of powerful organizations are concerned. Ultimately, this injunction won't be upheld, but it won't matter, because the conference will be over. It is therefore possible for any wealthy interest to suppress any arbitrary conference proceeding in the United States without any justification.
Federal judge halts Defcon talk on subway card hacking | The Register