Ad Wall circumvention and the DMCA

So a number of internet sites have started to implement an “Ad Wall” wherein they require that surfers turn off any ad blocker to view their content. So of course some people came up with software that makes the adblocking undetectable thereby circumventing the Ad Wall. When looking into the subject I came across the question of whether such software could be considered “circumventing an access control” as outlawed in the DMCA. What say you legal types and wannabes?