Internet has been built as a decentralized network, in which no party can unilaterally decide to block the information flowing through the communications architecture. However, this founding principle of Net neutrality is now put into question by several legislative projects that seek to impose administrative filtering and blocking of websites. Whether it is online gambling, violent or pedopornographic content, but also defamation or copyright infringement, a growing number of democratic government are considering this mode of regulation of the Internet both ineffective and extremely dangerous for civil liberties.