[danneu]

Seems like this is what they're referring to:

    > Their publishers had sought damages, but said their motivation
    > was to challenge the software provider's wider business model.
    > While AdBlock Plus offers its web browser add-on to the public
    > for free, it makes money by operating a "white list" of adverts that
    > it allows to get through its filters.

For example:

    > In February, the Financial Times reported that one unnamed 
    > media company had said it had been asked to pass on the
    > equivalent of 30% of the extra revenues it would have made
    > by having ads on its platform unblocked.