If I was an attorney in this case, I think that I would press that it is the "I" rather than the "AP" that matters, and get into the area of cases where a UI, rather than an API, has been litigated. Wilmer Hale, a firm of note in this area, has a possibly useful page at http://www.wilmerhale.com/publications/whPubsDetail.aspx?publication=878 --dan