Gemstar-TV Guide has filed a federal patent infringement lawsuit against Diego's Moxi program guide, alleging that their TV listings are too similar to their own. Of course, Moxi has also filed an antitrust lawsuit against Gemstar. As usual, Gemstar wanted Moxi to license the program guide tech from them, and when Moxi refused, lawyers entered the picture, echoing TiVO v. Echostar on the lawsuit front. Because Charter is one of the major cable providers using Moxi technology, they are included in the lawsuit -- although surely not just to get some bigger bucks out of any potential settlement. We'll keep you updated on the lawsuit as we know more.