Apple has been sued in federal court by publisher John T. Colby, which is claiming trademark infringement over the use of the term “iBooks.” Bloomberg reports that Colby purchased the assets of various entities owned by New York publisher Byron Preiss, who had published more than 1,000 books under the “ibooks” name, beginning in 1999. Apple has a trademark on the term “IBOOK” as it relates to computers and once…