NEW YORK (AdAge.com) -- Using special filter systems, search engines and a crew of dogged digital gumshoes, Viacom has succeeded in having hundreds of thousands of infringing online videos removed from the Internet. Appearing at Gotham Media Ventures' recent legal seminar, the media giant's general counsel Michael Fricklas discussed that massive in-house operation. He also detailed how Viacom, which operates a slew of user-generated video sites across its many properties, systematically polices that content for copyright violations.