How do you people bootleg? On the file sharing forum, there are numerour bootlegs, many of which sound half decent. But how, oh how, do you do it? Recording devices are forbidden at concerts, and I can't see how you'd get a recorder (audio or video for that matter) through security.

I'm in no mind to go out and bootleg myself, but I'm just amazed at the number of bootlegs out there, and perplexed at how they come about. Can anyone explain to me the complex art of bootlegging?