under the Copyright Act. Cablevision, we note, also has subscribers who use home VCRs or DVRs (like TiVo), and has significant control over the content recorded by these customers. But this control is limited to the channels of programming available to a customer and not to the programs themselves. Cablevision has no control over what programs are made available on individual channels or when those programs will air, if at all. In this respect, Cablevision possesses far less control over recordable content than it does in the VOD context, where it actively selects and makes available beforehand the individual programs available for viewing. For these reasons, we are not inclined to say that Cablevision, rather than the user, "does" the copying produced by the RS-DVR system. As a result, we find that the district court erred in concluding that Cablevision, rather than its RS-DVR customers, makes the copies carried out by the RS-DVR system.
Our refusal to find Cablevision directly liable on these facts is buttressed by the existence and contours of the Supreme Court's doctrine of contributory liability in the copyright context. After all, the purpose of any causation based liability doctrine is to identify the actor (or actors) whose "conduct has been so significant and important a cause that [he or she] should be legally responsible." W. Page Keeton et al., Prosser and Keeton on Torts § 42, at 273 (5th ed. 1984). But here, to the extent that we may construe the boundaries of direct liability
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