Cookie management

When you visit a website published by a CNRS entity, information may be recorded in " Cookies " files deposited in the browser of your terminal (computer, tablet or cell phone). This page allows you to understand what a cookie is, what it is used for and how you can accept or refuse those that are not essential to the operation and management of the site.

What is a cookie?

A cookie is a small text file containing small amounts of information (including an identifier in the form of a number, (a session for example, a choice of language, a code to protect your navigation, the name of the server that deposited it and possibly an expiration date) and may be stored temporarily, subject to your choices for cookies not necessary for the operation of the site, on the hard drive of your terminal when visiting a website through your browser. Cookies are managed by your internet browser and the user can read them by right-clicking on the web page and "Inspect code".

Only the sender of a cookie can modify the information contained in it. A cookie can be either a session cookie or a permanent (or persistent) cookie.

A session cookie persists only during the browsing session and is deleted when the browser is closed. A permanent cookie is set for a specific period of time. This type of cookie remains in the terminal until it expires or until it is deleted from the computer via the browser settings or extensions.

The cookie does not identify you personally, but only the browser of your terminal. Some cookies require your prior consent before being installed on your terminal.

What are cookies for?

Mandatory cookies

These are cookies deposited exclusively by the site editor. They are essential for navigation on the site. These cookies cannot be deactivated or configured, otherwise you will no longer be able to access the site, the site's services and/or alter its display. They allow you to use the main features of the site and to secure your connection. The deposit of these cookies does not require your prior consent. Their lifetime does not generally exceed the duration of the session.

Functional cookies

These cookies are necessary for the operation of the site. The deposit of these cookies does not require your prior consent. These cookies allow :

  • To establish anonymous statistics of frequentation and use of the various elements composing the site to allow its editor to administer and improve the said site.
  • To adapt the presentation of the site to the display preferences of your terminal (language used, display resolution, operating system used, etc.) during your visits to the site, according to the hardware and software for viewing or reading that your terminal has.

The sites published by the CNRS entities use the Matomo hearing analysis tool, which complies with the RGPD specifications. The Matomo tool can deposit several cookies with a life span ranging from session time or a few tens of minutes to 11 months.


Functional cookies set by the CNRS:

  • Name: _pk_ses
    Service provided: Traffic statistics (Matomo)
    Purpose: This cookie temporarily stores the current session.
    Duration : 30 minutes
  • Name: _pk_id
    Service provided: Traffic statistics (Matomo)
    Purpose: This cookie assigns a unique identifier to the user.
    Duration : 11 months
  • Name: _pk_testcookie
    Service provided: Traffic statistics (Matomo)
    Purpose: Checks if the browser accepts cookies.
    Duration: Session
    Service provided: CSRF (cross-site request forgery) protection
    Purpose: To prevent fraud, protect the user and the reliability of the data collected by Matomo.
    Duration : Session


Third Party Cookies:

Some sites may include third-party computer applications that may place "social" and advertising, targeting and tracking cookies.

In particular, the services :

  • Consent or refusal to deposit cookies from the Axeptio tool, published by the French company Agilitation, which was chosen by the CNRS to manage cookies
  • Viewing of content by hosts such as YouTube, Dailymotion etc. for videos.
  • To share information on social networks that allow you to share content from the site with other people or to let these other people know about your consultation or your opinion concerning a content of our site.

The cookies placed by these third parties may remember the pages and websites you have visited and may collect personal data such as IP address and share it with third parties. These cookies allow advertising agencies to present you with targeted and personalized ads. Their lifespan is variable, ranging from a session time or a few tens of minutes to several years.

The CNRS site you are visiting has no control over the process used by content hosts and social networks to collect information about your browsing habits, and associated personal data they have.

You can manage the deposit of these cookies. To view certain content offered by the CNRS, you must first accept cookies from these third parties.

How do I manage the cookies set by this CNRS site?

Cookies that do not have the exclusive purpose of enabling or facilitating communication by electronic means or that are not strictly necessary for the provision of an online communication service at the express request of the user require the prior consent of the Internet user.

Tracers whose purpose is limited to measuring the anonymous audience of the site or application, to meet various needs necessary for the functioning and current administration operations of a website are not subject to consent.

To manage the cookies deposited by a CNRS site, you have several possibilities that complement each other:

  • Accept or refuse unnecessary or non-functional cookies with the Axeptio certified consent tool that is offered or being installed on most CNRS sites. On the sites concerned, a "Cookie management" widget button allows you to accept or refuse cookies requiring consent, in particular those from third-party companies. The widget provides information on the purposes of these cookies and a link to their privacy policy via a "?
  • Exercise your choices with third-party companies by consulting their privacy protection policy. You will find there the purposes of use, in particular advertising, the navigation information that they can collect thanks to the application buttons available on the consulted site and you will be able consequently to parameterize your accounts of use to accept or refuse the tracers deposited by these companies.
  • Control cookies using your browser settings. Most of these cookies can be disabled by setting your browser to only accept cookies from the sites you visit (refuse "third party sites", check the Do not track me box on most browsers) in the preferences of your browser software. In "Private Browsing" mode, cookies will only disappear when you close the browser windows on the site.

How to set up browsers?

In order to manage the cookies as closely as possible to your wishes, we invite you to configure your browser by taking into account the purpose of the cookies:

  • The web browser can be set to warn you before a cookie is set.
  • The browser can also be set to refuse all types of cookies or only third-party cookies.
  • Any cookie already installed on the computer can be deleted.
  • Each browser must be set up separately to refuse cookies.

Disable/Delete Cookies on your browser

For Internet Explorer™:

For Safari™:

For Safari™mobile:

For Chrome™:

For Firefox™:

For Opera™:

For Microsoft Edge™:


Use blockers for cookies and other trackers via browser extensions such as :


Blocking mandatory or functional cookies may disrupt your browsing and restrict the services offered.

Manage advertising cookies for certain advertisers on two professional platforms and at Google:

Disable Social Network Cookies

Setting up your smartphone

For iOS™: https: //

For Android™: https: //

Other Browsers: For more information on how to manage cookies through other browsers, please consult your documentation or online help files.

You can also consult the CNIL website to learn how to set up your browser to control the deposit of cookies on your terminal.

CNRS Data Protection Officer

If you have any questions about our cookie management policy, please contact the CNRS Data Protection Officer.