It's often difficult to get an official policy out of a band and it's always best to ask at the gig. Bands are usually quite likely to allow taping on the night, but will not commit to an official comment via their management.
Those that do have official policies often have rules attached, for example:
And bands often find that if they've gone to the effort to officially explain their feelings their rules are usually followed and patrolled agressively by fans.
What's Walken's policy? My policy as the "official Walken gig recorder" (tm) is if you want to tape us please come and see us before the gig and ask, and if you have taped, we must get a copy.
"We could have probably squeezed out a couple more records but the collective personality of this group became so dysfunctional," Patton says. "This band was poisoned by one person's petty jealousy and insecurity, and it led us to a slow, unnatural death. And I'm at peace with that, because I know I tried all I could."
To those at the gig who are now selling their blood soaked t-shirts and ticket stubs on eBay, and those demanding their money back, you're all going to hell.
Updated news [antimusic.com].
NBC 4's reporter on the scene, David Wayne, initially reported that two members of the band, including Dimebag, were shot and killed and the gunman also died on the scene. (updated) However, it was later learned that Dimebag was the only band member murdered. Two fans, Nathan Bray and Erin Halk as well as the band's head of security, Mayhem (Jeff Thompson) were also murdered. Chris Paluska from the band's management company and the group's drum tech Cat (John Brooks) were both injured. Paluska is reportedly in critical but stable condition and Brooks is expected to be discharged from the hospital on Friday.
Wikipedia impresses me again with a biography of Nathan Gale already with far more information than any official news item.