1) Apple tries to shield the iOS developers using its previous licensing agreement.
2) Someone else tries to get the patents invalidated. Several companies whose clients were targeted by Lodsys have filed preemptive lawsuits requesting declaratory judgements that Lodsys' patents are invalid, and some independent developers led by former Apple engineer Mike Lee have formed a legal defense fund to fight Lodsys and other patent trolls. Even if Apple believes the patents wouldn't stand up to reexamination, it is suspected that the secret terms of the license agreement with Intellectual Ventures prohibits Apple from attempting to have the patents invalidated.
1) Apple tries to shield the iOS developers using its previous licensing agreement.
2) Someone else tries to get the patents invalidated. Several companies whose clients were targeted by Lodsys have filed preemptive lawsuits requesting declaratory judgements that Lodsys' patents are invalid, and some independent developers led by former Apple engineer Mike Lee have formed a legal defense fund to fight Lodsys and other patent trolls. Even if Apple believes the patents wouldn't stand up to reexamination, it is suspected that the secret terms of the license agreement with Intellectual Ventures prohibits Apple from attempting to have the patents invalidated.