Following the departure of founders Randy Saaf and Octavio Herrera, the future for MediaDefender looked even more uncertain than it did previously. However, those concerned that their favorite anti-piracy spoofing company might drift away, fear no more. MediaDefender's parent company just acquired everyone's favorite anti-piracy tracking company, MediaSentry.
MediaDefender Buys MediaSentry | TorrentFreak

A desperate measure caused by all the recent death blows, I think.