A "cookie", so named because its shape recalls the shape of the cake, allows a site to remember the tastes of the user through visits and purchases which he made and decide to reuse this information. A European directive decided to limit these practices, the English legislature has provided the obligation for sites to warn the user that connects that a cookie identifies him and agrees of this acquisition of personal information, the justification for the Act is the protection of personal information that a third party data protection may thus have without the consent of the person concerned. The Act came into application in the United Kingdom on May 25, 2012. Some companies they say it technically inapplicable, both as relevant information to justify the application of the consent form and what form the consent of the user should take. They are more concerned because the entire device is subjected to penal sanctions.