Let's admit it — some of it is a "pirated" content. But, this has never been challenged in court. Library registered in the Ecuador, country that doesn't have any bad law like DMCA. So, there is no way to sue that library without bombing the whole country. But ISPs in US found the way — they just block IP addresses without even telling you. To this moment there are at least 2 ISPs that block your access — Surewest and Bell. Try yourself to check if your provider is a bad guy: http://lib.rus.ec/.
Hail the censorship! Ditch the free speech! US people, welcome to North Korea!