Due to the entry into force of the Spanish law of the “Information Society Services” (LSSICE) established by Royal Decree 13/2012, it is mandatory to obtain express consent from the user in every website using non necessary cookies before the user navigates them.


Cookies and similar technologies such as local shared objects, flash cookies or pixels, are tools used by web servers to store and retrieve information about their visitors and offer a proper functioning of the site.

By using these devices, the web server is able to remember certain information related to the user, for example their display preferences, name, password, products that may be interesting for him/her, etc.


According to the EU directive, the cookies that require informed consent by the user are analytical cookies, advertising cookies and affiliate cookies. Technical cookies or cookies that are required for the functioning of the website or the services provision expressly requested by the user are excluded.


There are five big groups of cookies:

  • Analytical Cookies: they collect information on the use of the website.
  • Social Cookies: these cookies are necessary for external social media.
  • Affiliate Cookies: they allow to track visits coming from third-party sites that have an affiliation contract with the website (affiliate companies).
  • Advertising and Targeting Cookies: they collect information about preferences and personal choices of the user (retargeting).
  • Technical and Functionality Cookies: they are strictly necessary for the use of the website and the provision of the contracted service.


  • ac_cookies: strictly necessary technical cookie that contains the information about the acceptance of the cookies installation. It will expire 1 year from the last update.
  • _ga: Google Analytics cookie that enables the unique visits function. The first time a user enters the website trough a browser, this cookie will be installed. Next time the user enters the website again, this cookie will consider it is the same user. Only if the user changes the browser, he/she would be considered as a different user. This cookie will expire 2 years from the last update.
  • _gat: This cookie is associated with Google Analytics Universal. It is used to rate limit to a request. – Limitation of data collecting in high traffic websites. It expires after 10 minutes.
  • _utma: Google Analytics cookie that collects the first visit date and last visit date of the user to the website. It will expire 2 years from the last update.
  • _utmb: Google Analytics cookie that collects the time the website is visited. It will expire after 30 minutes from the last update.
  • _utmc: Google Analytics cookie used for the interoperability with the tracking code urchin.js. It is eliminated when closing the browser.
  • _utmt: Google Analytics cookie. This cookie is used to process the type of request sent by the user. It expires when finishing the session.
  • _utmv: Google Analytics cookie. This cookie is used to segment demographic data. It expires when finishing the session.
  • _utmz: Google Analytics cookie that stores the traffic source or a campaign to explain how the user got to the website. It will expire 6 months from the last update.



  1. On your computer, open Chrome.
  2. At the top right, click More and then Settings.
  3. Under “Privacy and security,” click Cookies and other site data.
  4. Click See all cookies and site data and then Remove all.
  5. Confirm by clicking Clear all.
  6. Restart your Browser.

For further information about Chrome:

Internet Explorer. Version 11

  1. Select the Tools button.
  2. Point to Safety.
  3. Select Delete browsing history.
  4. Select the Cookies and website data check box.
  5. Select Delete.
  6. Restart you Browser.

For further information about Internet Explorer:

Firefox. Version 18

  1. Open the Firefox Menu | History | Clear Recent History.
  2. Click the drop-down menu next to Time range to clear to choose how much of your history Firefox will clear (the last hour, the last two hours, the last four hours, the current day or everything).
  3. Use the check boxes to select what information you want to clear from your history: Cookies, Cache, Active logins…
  4. Click the OK button. The window will close and the items you’ve selected will be cleared from your history.
  5. Restart your Browser.

You can accept or reject cookies individually in the Firefox preferences section. History > Tools > Options > Privacy.

For further information about Mozilla Firefox:

Safari Version 5.1

  1. Launch Safari browser on your Mac.
  2. Select Safari -> Preferences
  3. Click the Privacy tab and select Manage Website Data….
  4. Select a website that is listed as using cookies, then click Remove. To remove all website data from Safari, click Remove All.

For further information about Safari:


Settings – Advanced – Cookies.
The cookies options control the way Opera handles them and therefore their acceptance or reject.

For further information about Opera:

Other browsers
Please consult your web browser’s documentation for more information.