Earlier this month, a Philadelphia Comcast broadband subscriber got a letter from his service provider, telling him he'd been using the Internet too much.

Keith, who asked to keep his full name private, said he'd subscribed to the service for four years and never had a complaint before. Now he was being labeled a network "abuser."

Worse, he said, Comcast refused to tell him how much downloading was allowed under his contract. A customer service representative had told him there was no specific cap, he said, adding that he might avoid being suspended if he cut his bandwidth usage in half. But even then, the lack of a hard number gave Keith no guarantee.

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