The legal skirmishes continue to pile up for Research in Motion (RIM), as the Canadian wireless hardware and software maker filed a fourth lawsuit against rival startup Good Technology.

RIM (Quote, Company Info, News) has elevated the charges beyond concerns that Good's technology infringred on some of its own, suing the Sunnyvale, Calif. firm and one of its vice presidents for a mouthful of offenses. These include: misappropriation of trade secrets, breach of contract, tortious interference with contracts and prospective economic relations, unfair competition, unjust enrichment, breach of implied duty of good faith and fair dealing, and civil conspiracy.

Also unlike the three previous lawsuits, this one was filed in the United States Superior Court of the State of California -- not Delaware district court.