In Russia ISPs are legally required to block access to "extremist" materials from the publicly available list (in Russian: http://www.minjust.ru/ru/activity/nko

In Russia ISPs are legally required to block access to "extremist" materials from the publicly available list (in Russian: http://www.minjust.ru/ru/activity/nko/fedspisok/ http://www.minjust.ru/ru/activity/nko/fedspisok/, most of entries are leaflets or books, but grep for "http" or "www"). The list is known to contain some technically-impossible-to-block entries so most ISPs probably resort to domain-level blocking by filtering DNS entries or filtering access by IP address. Some sort of gray area here. When ISP reach certain size, they also must set up a special device to allow Federal Security Service to sniff the network traffic (http://en.wikipedia.org/wiki/SORM#SORM-2 http://en.wikipedia.org/wiki/SORM#SORM-2) for law enforcement purposes. I've never seen such hardware, but contrary to anecdotal evidence, it's just a specialized passive packet sniffer, connected to mirrored port. Also, ISPs are required to keep access logs, and give them out on legal requests, but this is probably common virtually everywhere. Officially, that's all (unless I forgot something, but hopefully I didn't). I don't know whenever the level of "unofficial cooperation" were ever estimated, but I suspect it to be fairly average, compared to the rest of the world.