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The cable television industry’s answer to the increasing threat from Internet video sites such as YouTube and Hulu focuses on a clear-cut strategy: Make cable subscriptions portable to any Internet accessible device such as a laptop computer or even a mobile phone for no additional charge. Experts at Wharton say the move is a promising early step in meeting the Internet video challenge but they expect more such experimentation ahead. See acast.com/privacy for privacy and opt-out information.