Chicago – Tribune Media Services, the publisher’s entertainment information database unit, announced on Thursday that it has acquired CastTV, a video search, index and discovery platform.

Financial terms of the transaction were not disclosed.

Founded in 2006, San Francisco-based CastTV has to date raised $3.1 million in venture capital, from Draper Fisher Jurvetson, Ron Conway, Marc Andreessen and others.

Tribune plans to integrate CastTV’s service, which counts 4 million monthly unique users, with its own Zap2it.com entertainment network.