Some (potentially) new material showed up today on the TruEffect privacy pages. There’s a nice detailed explanation of how their opt-out cookie works, and it is a non-unique cookie (our favorites!).
The cookies still operate under the adlegend.com domain. I am not sure whether these are separate companies or just legacies of prior brands, and have no time to research it today — too busy working on privacychoice 2.0!