Previously: Apple Legal sends letter to Lodsys claiming that Apple has licensed Lodsys patents on behalf of all iOS third-party developers. Lodsys answers stating that Apple is misunderstanding the license at hand, and starts filing lawsuits against seven small iOS developers.
Today, Apple filed a motion to intervene in the matter. From Foss Patents:
Apple’s proposed defense against Lodsys’s claims is exclusively related to the assertion that the alleged infringements are covered by an existing license agreement in Apple’s favor (which I’m pretty sure harks back to when Lodsys’s patents belonged to Intellectual Ventures). (…) Apple does not raise any other affirmative defenses, such as claiming that the patents are invalid or that they don’t read on the accused products.
(…) But for Apple’s own proposed participation as an intervenor it makes sense to focus on the theory of exhaustion (meaning that Lodsys can’t get paid twice for a licensed use of the patents in question). In connection with that particular defense theory, Apple has by far the strongest basis for asking to be admitted as an intervenor.
More info on Foss Patents.