If they are going to ban the feds from attending the conference, are they going to ban the contractors who are working with the feds also? I imagine that the majority of the "security and hacking" type work is not done directly by the feds but by their contractor (e.g. in Snowden's case he was not working for the NSA but for Booz Allen Hamilton).

If they are just banning the feds then I think this is just a press stunt since it won't change a single thing.