Apple isn't backing down from Nokia's charge that it infringed on 10 patents covering technology used in the iPhone. And the Finnish mobile giant isn't retreating, either, from its charges that the Cupertino, Calif.-based iPhone maker failed to license key wireless technology in the popular smartphone -- and that it's "attempting to get a free ride" from Nokia's research on GSM, 3G and Wi-Fi.

In response to last week's lawsuit, Apple (NASDAQ: AAPL) said in its latest 10-K filing with the Securities and Exchange Commission that it would "vigorously" defend itself against the charges.

For both companies, the stakes appear high: Some legal analysts estimate that damages from the suit could be worth $1 billion.

Nokia (NYSE: NOK) maintains that Apple refuses to play fair following a breakdown in negotiations over a wireless technology licensing agreement.

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