This post inspired by https://twitter.com/BernardKeane/status/217535549731389440
So, we know that Netsweeper is used by Telstra - http://www.zdnet.com.au/telstra-logs-customer-history-for-new-filter-339340337.htm
We know that Netsweeper is used in Qatar, the UAE and Yemen ( http://en.wikipedia.org/wiki/Internet_censorship - see also http://www.guelphmercury.com/news/local/article/577673–aiding-repression-or-just-doing-business ) and these states use it to suppress free speech and access to information.
The majority of countries that implement suppression of free speech on the internet could not afford the high cost of developing such software. The only thing that makes it possible is the subsidies from companies in the free world. With Telstra using Netsweeper, they directly contribute to the development costs of this software.
In years gone past free speech was suppressed by members of secret police and guns. Now you can do a lot of that with software. Software that is made affordable because the development costs are shared with companies such as Telstra.
See also my last two posts on the topic: