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。

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Filtering and antivirus companies always seem one step behind the rapidly evolving methods of clever spammers.

邮件过滤以及反病毒公司似乎总是比那些狡猾的垃圾邮件提供者晚一步采取行动。

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Current approaches aren't working; even though home users and many companies started filtering their email two years age, the overall amount of junk mail has ballooned exponentially.

目前采用的方法都不可行。虽然两年前家庭用户以及许多公司用户都已开始使用邮件过滤功能，但垃圾邮件的总量还是呈几何指数增长。

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Many filtering companies rely on analysing the text on webpages for keywords or trigger phrases in close proximity to each other.

BBC: Net filters fail the children

Many companies use filtering software, produced by companies such as SurfControl and WebSense, which uses a watchlist of sites and stops employees reaching any website on the banned list.

BBC: The problems of finding filth

But even with this new tool, YouTube's filtering makes media companies work too hard to find and delete their content from the site, argues Gregory Rutchik, the founding attorney of the Arts and Entertainment Law Group.

FORBES: YouTube's Filter Fails to Please