The legislation of protecting copyright is valid in the sense that a copyright owner does not want their work to be reproduced and redistributed on the internet without their permission.
One of the forms in which copyright is violated is through torrent sites.
Governments around the world have considered forcing the ISPs to block popular torrent sites to try to limit copyright infringement, but will this actually work? First of all these torrent sites do not have any illegal content on them.
Think of them as the search engine for torrents.
One may find illegal files on a torrent or legal ones, but the files are not on those sites at all.
This would be blocking access to those files.
There is somewhat of a fallacy in this thinking of blocking sites because Google, Yahoo, and Bing have links to illegal torrents as well.
Would ISPs block search engines too? If search engines still existed, which they would, torrents to illegal files will still be found.
While it's not something that most people might think about, it's true that these types of files are found with a search online.
Secondly, people who really want to use those sites that are blocked will just use proxies.
This is what many do in China where the government blocks most of the internet.
A proxy can go around artificial blocks and access content.
If these methods didn't work, people sharing illegal files would just find another method.
Peer to peer movie sharing dropped considerably on torrent sites because streaming movies is just easier.
If one could not get a movie through a blocked method the internet leave 1000 others meaning the person who wants illegal content will just do something else.
While the heart of the matter is in the right place, the concept of blocking a group of listings to stop piracy is a bit short sighted.