America Online has quietly secured a patent that could shake up the competitive landscape for instant messaging software.
The patent (6449344), originally filed in 1997, and granted in September this year, gives AOL instant messaging subsidiary ICQ rights as the inventor of the popular IM Internet application. The patent covers anything resembling a network that lets multiple IM users see when other people are present and then communicate with them. The breadth of this definition could create controversy in the industry. AOL's primary competitors, Microsoft and Yahoo, have their own instant messaging services, each with millions of subscribers. With the patent, AOL could technically sue rival instant messaging services for infringement backed by the argument spelled out in the patent.
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