I have nothing add, although I would like to comment on the statement you made earlier in this thread that you've had your equipment confiscated once. I realize that things are different here in the US than in Europe, but I've recorded plenty of shows in Europe too. While I'm no expert on laws and such, I would say that even if I were caught trying to stealth a show in Europe, only in the extremest situation would I ever allow anyone to touch my gear. I suppose if it's a police officer that's taking my gear from me, I wouldn't have too much to say about it. However, if it's someone at the front door of a venue, there's simply no way they're getting my gear. If I have to leave quickly, then I'll leave.
I know that situations can escalate and that there's times when giving up your gear might seem like the only option. I'm just suggesting that, before it gets to that point, I would calmly (using non-confrontational verbal and body language) explain to the people you're dealing with that you'll cooperate, but NO they will not be touching my gear. Do this as you're walking towards to exit, so hopefully you'll be near or in your car by the time any situation might escalate.
Question: In Europe, since many venue's also say 'no pictures', do they have a right to confiscate your picture phone if someone decides to shoot a picture against the rules? I know Europe, and I also know that everyone has a cell phone and that everyone uses them multiple times daily!!!!