Last updated: May 21, 2018

This Cookie Statement explains how Rubicon Project and its affiliates (collectively “Rubicon Project”, “we“, “us“, and “ours“) use cookies and similar technologies in the operation of its technology platform (“Platform“).  It explains what these technologies are and why we use them, as well as your rights to control our use of them.

What are cookies?

Cookies are small data files that are placed on your computer or mobile device when you visit a publisher client’s website that uses our technology. They allow us to collect information (like your IP address or other device identifiers) from your device.

What cookies do we use?

We use a variety of cookies in connection with the Platform for several reasons. Some cookies are required for technical reasons in order for our Platform to operate. Other cookies enable us to track and target the interests of end users (“end users” or “you”) of our publisher client websites that use our technology on those websites.  We may also use cookies for advertising, analytics or other purposes.

The table below details some of the cookies most frequently used by our Platform and the purposes they perform.  All cookies are set on the domain:


Cookie Name Purpose
trp_optout Log Preferences: Cookie indicating that a user has opted-out of behavioral targeting marketing.
FPTrust Log Preferences: These cookies support the opt-out process via the Network Advertising Initiative (NAI).
Khaos Platform Operations: Internal user identifier used for analytics.
rsid Platform Operations: Session cookie that contains information about a device, including region (derived from IP address, not geolocation data), operating System, browser, etc., that is used during the ad inventory sale process.
fcap Platform Operations: Number of times we have shown an ad on a per user basis.
sput, sput_* Analytics: Contains multiple bidder identifiers (i.e., data that would be stored in multiple put_* cookies) in a smaller number of cookies.
ses* Analytics: Indicates number of times Rubicon Project has served a user an advert for this particular unit of inventory.
vis* Analytics: Indicates number of times a user action has precipitated an ad request for this particular unit of inventory.
cd Analytics: Indicates whether cookies are disabled for the device.
cimg* Analytics: Contains information about served ads (timestamp, site, internal identifiers for the publisher, buyer, advertiser, and displayed advertisement).
audit Analytics: Used to record cookie consent data.


What other similar technologies do we use?

Cookies are not the only way to recognize or track end users.  We may use other similar technologies, including:

  • “Tags and Pixels”: These are blocks of code that we and our customers may use to track your navigation of websites or apps using our technology, and your browsing behavior. We use these to synchronize information that we have collected with information independently collected by our customers and other third party advertising platforms and advertisers that are interested in providing you with ads.
  • “SDKs” or “Software Development Kits”: These are blocks of code similar to tags and pixels that are embedded into an app that allow us to track certain information relating to your use of apps using our technology.
  • Mobile device identifiers:  We also use standard device identifiers, for example the “IDFA” advertising identifier used on Apple’s iOS devices and the “Google Advertising ID” advertising identifier used on Android devices, to track your use of mobile apps.

Do third parties serve cookies or other similar technologies through our Platform?

Third parties may serve cookies on your computer or mobile device to serve advertising through our Platform, or for analytics or other purposes. These companies may use information about your visits to websites using our technology in order to provide relevant advertisements about goods and services that you may be interested in. They may also employ technology that is used to measure the effectiveness of advertisements. This can be accomplished by them using cookies or web beacons to collect information about your visits to this and other sites in order to provide relevant advertisements about goods and services of potential interest to you. The information collected through this process does not enable us or them to identify your name, contact details or other personally identifying details unless you choose to provide these.

Please see below for examples of the third parties that may use our Platform in order to serve cookies.  Note that we do not have access or control over these cookies.


Types of third party cookies


Who serves these cookies How to refuse
Essential website cookies: These cookies are strictly necessary to provide you with services available through our Platform and to use some of its features, such as access to secure areas.


White Ops Because these cookies are strictly necessary to operate the Platform, you cannot refuse them. You can block or delete them by changing your browser settings however, as described below un the heading “How can I control my cookies?”
Analytics and customisation cookies: These cookies collect information that is used either in aggregate form to help us understand how our Platform is being used and provide us with key analytics.


Moat (Oracle) If you do not wish for us to install cookies on your device for the purposes described above, you may change the settings on your browser to block or limit cookies. For more information, please see
Advertising cookies: These cookies are used by third parties to make advertising messages more relevant to you. They perform functions like preventing the same ad from continuously reappearing, ensuring that ads are properly displayed for advertisers, and in some cases selecting advertisements that are based on your interests. Third Party Technology Providers If you do not wish for us to install cookies on your device for the purposes described above, you may change the settings on your browser to block or limit cookies. For more information, please see

How can I control cookies?

You have the right to decide whether to accept or reject cookies.  You can exercise your cookie preferences by following the opt-out instructions below.

Your Opt-Out Choices

Should you wish to opt-out of the use of information about the websites you visit in order to serve targeted advertising to you using our “display” technology, you can do so using the opt-out tool on our website, at

You can also refuse or accept cookies from the Platform at any time by activating settings on your browser.  Information about the procedure to follow in order to enable or disable cookies can be found on your Internet browser provider’s website via your help screen.  You may wish to refer to for information on commonly used browsers.  Please be aware that if cookies are disabled, some website features may not operate as intended.

Additionally, you can opt-out of receiving targeted advertising that our customers may conduct using our Platform. Please review our Privacy Policy and the section headed “Your Opt-Out Choices” for further information.

Please note that opt-outs operate by placing a cookie on your device that is unique to the browser and device you use to opt-out. They may not function properly if you have configured your browser to reject certain cookies. If you change browsers or computers, or delete the cookies on your computer, you will need to opt-out again. You also can set your browser to notify you when a cookie is being set and to block most cookies, including ours.

How often will you update this Cookie Statement?

We may update this Cookie Statement from time to time in order to reflect, for example, changes to the cookies we use or for other operational, legal or regulatory reasons.  Please therefore re-visit this Cookie Statement regularly to stay informed about our use of cookies and related technologies.

The date at the top of this Cookie Statement indicates when it was last updated.

Where can I get further information?

If you have any questions about our use of cookies or other technologies, please email us at