If I am not mistaken, Bruce himself stated in a recent Swedish concert, something to the effect, that if your bootleging this. Don't just share it with your friends but share it with the world. That in my opinion is an "official" greenlight to share Maiden boots.
during a concert in zagreb(well velike gorica but who gives a fuck) in 2003(gmetid tour) before playing wildest dreams bruce said:
We have got a new album. We do we made it its all ready to go. September its released here in Croatia and its called the Dance of death. We're gonna play you a new song from it now all right to give....to give you an idea what it sounds like. Ahh any of you wanna record this song or take pictures of it and use your mobile phone send it to a friend, put on the internet that's ok with us. But please do us a favour in September if you like the record just do the honest thing and go buy it anyway cause that's cool thing to do. We'll leave it to your discretion, we'll leave it to your honesty, we'll leave it to your honour Zagreb that you'll do that kind of shit.
doesn't get any clearer than this that boots are ok as far as they're concerned