Apple has been on a suing-spree recently. They filed an aggressive patent infringement lawsuit against Samsung in the recent past for blatantly copying the iPhone, iPad (both at software and hardware level) as well as HTC for infringing on software architecture and user-interface patents.
At a shareholders meeting, Sony's CEO Howard Stringer blamed recent attacks on several of the company's properties on several steps it took to "defend Sony's intellectual property", presumably referring to the lawsuit Sony started against George Hotz for releasing a "jailbreaking" tool for the PlayStation 3.
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