The DMCA Is a Separate Layer
In Cox Communications v. Sony Music, the Supreme Court's contributory-liability holding and the DMCA's safe-harbor system ask related but different questions. This chapter separates those questions. It explains what section 512(a) does for a mere-conduit ISP, why repeat-infringer policies and knowledge rules exist, and why losing a safe harbor is not the same as proving that a provider infringed. That separation is the key to understanding why the Court rejected Sony's attempt to use the safe harbor as support for a knowledge-based liability rule.
The DMCA is often described too simply in two opposite ways. One description treats it as immunity for Internet companies. The other treats its conditions as evidence that an ISP serving a known infringer is itself liable. Neither description captures the statutory design. Section 512 offers limitations on liability for qualifying activities when providers meet conditions. The underlying liability question remains separate.
A bargain built from functions and conditions
Congress enacted section 512 in 1998 while the Internet was expanding beyond a small network of early users. The Copyright Office's later report describes two goals that had to coexist. Online service providers needed enough legal certainty to invest in network capacity and new services without facing potentially devastating liability for everything users did. Copyright owners needed a workable way to address widespread online infringement rather than pursuing every individual act one by one.
The compromise was not a declaration that either side always wins. Congress created safe harbors: limitations on monetary liability and other relief for providers engaged in specified activities and complying with specified conditions. For some providers, the conditions include responding to rightsholder notices. For all of the main safe harbors, the report identifies threshold obligations involving repeat-infringer policies and standard technical measures. The structure tries to exchange some protection from liability for cooperation against infringement.
The functions matter because “online service provider” covers different kinds of activity. The Copyright Office report uses “ISP” narrowly for a mere-conduit provider under section 512(a), while using “OSP” for the broader category of online service providers covered by section 512. The four principal safe-harbor categories correspond to different roles: transmitting or routing material as a conduit, temporarily caching material, storing material at a user's direction, and referring or linking users through information-location tools.
A single organization can perform more than one of those functions. A network company may provide connections and also host a website. A platform may store user material and provide search or linking features. The applicable limitation depends on the activity at issue, not merely on the company's preferred label. That function-based structure is why the notice and knowledge rules for a hosting service cannot simply be assumed to govern a mere conduit in the same way.
Section 512(a) protects qualifying transmission, routing, connection-provision, and intermediate transient storage carried out through a provider's system or network. The report identifies the prototypical example as an ISP that literally gives a user an Internet connection. That description fits the basic service Cox supplied in the Supreme Court's account.