Strong demand for a product designed to prevent NSA-style snooping could speed online file-sharing services provider Accellion Inc’s plans to go public, CEO Yorgen Edholm said. Accellion, whose 2,000 clients include household products maker Procter & Gamble, advertising company Ogilvy & Mather and the U.S. Securities and Exchange Commission, plans an IPO in 2015, Edholm said in an interview. Founded in 1999, Palo Alto, California-based Accellion has annual revenue “closer to $50 million” than $100 million, and is growing by 50 percent or more a year, he said.