Answer: A service provider is defined as "an entity offering transmission, routing, or providing connections for digital online communications, between or among points specified by a user, of material of the user's choosing, without modification to the content of the material as sent or received" or "a provider of online services or network access, or the operator of facilities thereof." [512(k)(1)(A-B)] This broad definition includes network services companies such as Internet service providers (ISPs), search engines, bulletin board system operators, and even auction web sites. In A&M Records, Inc. v. Napster Inc., the court refused to extend the safe harbor provisions to the Napster software program and service, leaving open the question of whether peer-to-peer networks also qualify for safe harbor protection under Section 512.

There are four major categories of network systems offered by service providers that qualify for protection under the safe harbor provisions:

• Conduit Communications include the transmission and routing of information, such as an email or Internet service provider, which store the material only temporarily on their networks. [Sec. 512(a)]
  
• System Caching refers to the temporary copies of data that are made by service providers in providing the various services that require such copying in order to transfer data. [Sec. 512(b)]
  
• Storage Systems refers to services which allow users to store information on their networks, such as a web hosting service or a chat room. [Sec. 512(c)]
  
• Information Location Tools refer to services such as search engines, directories, or pages of recommended web sites which provide links to the allegedly infringing material. [Sec. 512(d)]