In Apple's form 10-K filed yesterday the company revealed that it will defend itself vigorously against Nokia who earlier this month took action against Apple.
Nokia claims that the iPhone breaches certain patents related to "one or more of the GSM, UMTS and 802.11 wireless communications standards" and seeks unspecified compensation or other relief.
Apple's response to the case is not yet due but intends to "defend the case vigorously."
Further reading: Apple's 2009 Form 10-K.