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Nielsen to use watermarks to enhance local channel rating accuracy

Engadget - While we're watching our favorite shows in HD, it's easy to forget that they live and die by ratings, and those ratings aren't always collected with the latest technology. In an effort to improve the sample size and accuracy of ratings for local TV channels, Nielsen is starting to roll out a hybrid technology consisting of watermarks and return data from supporting pay-TV provider's set-top boxes, like DirecTV and Charter.

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