If you own a monkey and the monkey paints abstract art, the copyright holder is the monkey, not you. That is what the copyright law says. absurd as that may be. The creator is the owner. In this case the creator was the person doing the taping (unless it was a contracted work for hire). Therefore Landmark cannot be the copyright owner. Therefore they could not legally copyright register the creation. Without a copyright registration they cannot sue anyone for copyright infringement.

Therefore if the purpose of Landmark is not to find out who to sue for infringement, then they have no legitimante need for the names. Indeed the DMCA is being used for an illegitimate purpose, it would seem. After all the “copyright” argument is bogus.