The logic is primarily based on filtering rules that may be applied on the message content, message header, service requester, and so on to decide the best service provider at run time.
该逻辑主要基于筛选规则，可以将这些筛选规则应用于消息内容、消息头、服务请求者等等，以在运行时决定最恰当的服务提供者。
Zango contended that immunity was meant to cover only Internet service providers, not companies that provide access to tools for filtering content.
Zango辩称法律规定的免责权只对网络服务提供商适用，而并不对提供内容过滤软件的公司适用。
Simple filtering relies on predefined groups, or classes, of visitors to determine what content is displayed or what service is provided.
简单过滤依赖于预先定义的群组或级别，由用户决定显示哪些内容和提供哪些服务。
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