A Dallas-area digital marketing and SEO specialist has responded to a federal lawsuit filed against him last month by the law firm Eberstein Witherite that claimed he devised and installed a series of "digital backdoors" into the firm's websites to divert potential client information to himself. In a response filed last week, Qamar Zaman denied Eberstein Witherite's allegations and filed a countersuit requesting a declaratory judgment that Eberstein Witherite owns none of the website copyrights,...