The precise number of websites blocked in the United Kingdom is unknown.
One known method is ISP scraping DNS of domains subject to blocking orders to produce a list of IPs to block.
The practice originated as a result of a court order applied against an incidence of copyright infringement was that taken out by the Motion Picture Association in December 2010 at the request of Hollywood studios.
The Association applied for an injunction to block access to Newz Bin2, a site which provided a search service for Use Net content, indexing downloads of copyrighted content including movies and other material shared without permission.
The application was lodged against BT, the largest Internet service provider in the United Kingdom with around six million customers.
The ENDF/B-VII.1 library is our latest recommended evaluated nuclear data file for use in nuclear science and technology applications, and incorporates advances made in the five years since the release of ENDF/B-VII.0.