This portlet warns your portals user that you are using cookies in agreement with the European Directive 2009/136/CE. According to this directive, since June 02, 2015 every public site need to alert their users and force them to accept cookie usage.

You can deploy this portlet on 6.1.x and 6.2.x Liferay installation, CE or EE. To activate this plugin you simply need to add a first property to your portal-ext.properties (and restart):
layout.static.portlets.all=cookiesnotification_WAR_cookiesnotificationportlet

If you want to customize alert message you can add a simple webcontent and configure it adding this property:
cookies.accepted.journalarticle.groupid=[web_content_group_id]
cookies.accepted.journalarticle.id=[web_content_id]