Electronic sell-through promises to be a new source of revenue for cable system operators, Jeff Baumgartner writes. The field already is dominated by Apple's iTunes Store, Amazon Instant Video, Google Play and other distribution channels, however. Comcast also has made a foray into the market. "We realized that we needed to move further upstream in giving customers the ability to not only rent movies but to own them," Matt Strauss of Comcast Cable said.
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