Well, Max has said in the past that he's recieved permission to post some copywright material. If these aren't on the list, then it would appear that in these cases they have a valid complaint. In that case, the neighborly thing to do would be to remove them.

As far as "non-exhaustive", I would imagine that legal weasel-wording for "We've looked through, and found these, but want a way to yell at you again if you post up something else we don't like".

All things considered, this could have been a LOT worse. I think that they may have originally hoped that the 'cat would roll over and fold. Presented with some form of resistance, they've provided what they claimed that they were after.

M