DVD Decrypter is great at copying DVDs, it the DVD version of EAC, so use it to copy your concert DVDs for sure. Shit programs like Nero can actually copy bad DVDs, and not tell you. I have had a few DVDs in which the bup and ifo files were bad (not authored correctly), yet Nero went ahead and burned them anyways. DVD Decrypter will tell you if there is a problem.