When was the last time you were frisked that intensively at a concert????Are they possibly gonna confiscate every persons Mobile Phone if they want to totally stop recording of the event!

You can get Audio recording devices now that are not much bigger than a Mobile,and even smaller Cameras.
I've been to many concerts and not taken my Video recorder for fear of it being confiscated,only to get into the venue and every man and his dog have Video equipment recording the Gigs.

Irrespective of there being warnings about illegal recording either Audiable or visually.In this day and age,just about everyone who has a video equipped Phone Films part of the Gigs of their Mobile.Never seen anyone kick them out or tell them to stop.
This is what you need Korg MR-1 1Bit Potable recorder 20 Gb H/drive, No bigger than your average Mobile Phone and discreet enough,if you were frisked you could blag them it was simply a Phone or an MP3 Player

,