What does this privacy policy cover?

Zebestof takes your privacy very seriously. This Privacy Policy governs and details the main privacy principles Zebestof (“we,” “us,” “our”) applies to the data we collect and process through our services. This Privacy Policy describes how Zebestof collects, uses, shares and secures personal information through our services, and also describes your choices regarding our use and your access to your personal information.

To read the privacy policy governing our corporate website only, please click here.


1) About Zebestof’s services

Zebestof specializes in creating personalized advertisements through “Zebestof Bestofbidder”. We work with online partners to build advertisements for users who visit their websites and with publishers to display personalized advertisements.

Our aim is to deliver advertisements that you might be interested in, based on your recent browsing behavior.

Example of a “Zebestof Bestofbidder” ad: if you visit and browse on Website A, on a subsequent online visit to Website B, you will see ads personalized by your browsing history on Website A.

With our service, you should receive personalized ads that are more relevant for you than the standard advertising you would receive without Zebestof. Click here for more information on Interest Based Advertising.


2) Our Technology

We collect information via tracking cookies and similar technologies placed on a user’s browser. These technologies allow us to analyze trends, and identify users’ interests around websites. You can control the use of cookies at the individual browser level, but if you choose to disable cookies, it may limit your use of certain features or functions on a website.

Thanks to these technologies, Zebestof “tags” visitors to its partners’ websites. Users tagged by Zebestof are given a technical identifier. At no point does Zebestof collect identifying personal data such as your name or address. Zebestof only analyses pages viewed made by the visitor and pages visited of the partner for whom Zebestof is delivering ads.

Our partners’ advertisements are displayed on many websites, also known as “publishers.” These publishers may also place cookies on your browser. These cookies are there so that the publishers recognize that Zebestof has a personalized advertisement available for your browser. Their use is governed by the specific privacy policies of the publishers which can be accessed directly from their websites.


3) Data Collection and Use

We do not know who you are. We only collect and use technical data relating to your browsing navigation to display personalized advertisements.

We collect browsing information

Data collected on Zebestof network

To serve relevant ads, we have to be able to single out patterns but we never willingly store data that would allow identification of a person (such as name, surname, phone number, address, etc.). We collect data related to your browsing activity through cookies that record:

  • events related to your activity on our advertising partner’s website (such as the number of pages viewed, the products you viewed on the partner website)
  • information related to your device (device type, operating system, version)
  • non-precise information related to your geography and derived from the truncated IP address of your connection (in order to serve you ads only for products and services available in your country, region or city)
  • and events related to the Zebestof ad serving activity such as the number of ads displayed to you.


We also gather certain information automatically. This information may include browser type, referring/exit pages, the files viewed on our site (e.g., HTML pages, graphics, etc.), operating system, date/time stamp, and/or clickstream data to analyze trends and optimize our services.

We do not use or store full IP address for targeting purposes. Your full IP addresses may only be used by Zebestof for the following purposes:

  • Fraud detection purposes to help alert us to situations which could not have been caused by human behavior, such as a massive amount of clicking in a limited period of time;
  • Sales attribution
  • Marketing reports with aggregated data.

We also collect technical user identifiers from our advertising partners for serve you relevant ads based on your behaviour across environments (“ID syncing”). For that purpose we may process and store:

  • Zebestof Bestofbidder :
    • Technical IDs of our advertising partners, and/or a of your CRM ID or of your email address – we use a double hashing method based on state-of-the art technologies to ensure the non-reversibility of your information. A hash of your email corresponds to a series of characters that does not permit your identification. For example, a hash of would be 98307a5ba02fa1072b8792f743bd8b5151360556b8e5a6120fa9a04ae02c88c0.


Data collected from trusted partners

We can collect technical identifiers from third parties for the purpose of improving our ID syncing and offering you a seamless online experience. These trusted partners commit to only sharing ID syncing information that allows us to link users’ cookies and to provide an efficient choice mechanism to end-users (opt-out).

For example, the linking information sourced from our partners could be Cookie ID ABC = MD5 hashed value. Our partners may use probabilistic or deterministic methods but in all cases please note that besides the ID syncing information, no other data (whether personally identifying information or non-personal identifying information) that could be collected by our partners in the course of their services are shared with us. Moreover, we require that all our partners provide users with a simple way to opt out from the collection and use of their data.


We do not collect any identifying information

We do not know who you are. We do not know your address, your place of work, your date of birth, your email address, your phone number.

We do not collect hardware-based identifiers such as UDID or MAC Address.

We do not collect sensitive information (such as religion, political opinion, health…).

We do not create segments to specifically target children under 16 years old.

We do not process any information which could be used by Zebestof directly to determine the personal identity of users.

We collect information in order to increase the relevancy of the ads being displayed to you. The data we collect is also used for reporting purposes, to give our clients and partners more information about the performance of their advertising campaigns, and to improve performance over time.​


We may share aggregated data

We may share aggregated data on the performance of our customers’ campaigns with our subsidiaries or affiliated companies, and we may share aggregated data with our partners. Aggregated data does not permit identification of a partner and does not permit you to be directly identified. We share non-aggregated data only upon approval of our partners and in compliance with our commercial agreements. Non-aggregated data may be stored by third parties such as data-centers and hosting providers who provide their services on our behalf. These companies are authorized to use the information we provide only as necessary to provide these services to us.

We partner with Ad exchanges platforms to buy ad placements through auctions for Zebestof Bestofbidder. Before the auction we link our ID with the ad exchange platform and then participate to the auction by sending the bid price and the banner code to display.


4) Zebestof commitments and adherence

Zebestof is an early adopter to initiatives of greater transparency and control for users.

Zebestof supports initiatives of greater transparency and control for users and in particular has been an early adopter to the following initiatives:


The IAB Europe

Zebestof belongs to the IAB Europe and Zebestof conforms to the OBA Framework. The IAB Europe offers consumers an online web opt-out platform and provides general information to consumers about privacy tools.



Zebestof is a member of the European Digital Advertising Alliance (“EDAA”) and is in compliance the EDAA’s Self-Regulatory Principles. Zebestof received independent data protection EDAA certification.

EDAA was founded by a European industry coalition representing advertisers, the advertising agency sector, the direct marketing sector, the advertising network sector and the media sector.

EDAA offers consumers an online web opt-out platform and provides general information to consumers about privacy tools.


Transfers of data outside EU

When it comes to data protection and privacy, we impose an high level of requirements to all our partners across the world. Thus, should the relationship with one of our partners involve cross-border data flows outside the European Union, our partner shall formally undertake to comply with the best data protection standards by adhering without any restrictions or limitations to the Standard Contractual Clauses adopted by the European Commission.


5) Data security and retention

We retain the technical data that we collect for up to 13 months from the date of collection. Our cookies expire 30 days after they are last updated.

Legal Notice

In certain situations, Zebestof  may be required to disclose data in response to lawful requests by public authorities, including to meet national security or law enforcement requirements.

We may also disclose your information as required by law, such as to comply with a subpoena or other legal process, when we believe in good faith that disclosure is necessary to protect our rights, protect your safety or the safety of others, investigate fraud, or respond to a government request. If Zebestof is involved in a merger, acquisition, dissolution or sale of all or a portion of its assets, Zebestof reserves the right to disclose or transfer your information, and you will be notified via email and/or a prominent notice on our website of any change in ownership, uses of your personal information, and choices you may have regarding your personal information.


User Choices

If your intent is to disable Zebestof services you need to read and follow instructions of next sections.

Please also note that if you are using a Safari browser, our opt-out feature will not work properly due to Apple Intelligent Tracking Prevention feature. If you are using a Safari version higher than 11.2, please refer to the last part of this section.


Zebestof Bestofbidder

If you wish to consult, modify, rectify, download the data concerning you or simply no longer receive announcements from Zebestof on your current browser, you can connect to our dedicated platform by clicking here.

When you opt out from our dedicated platform, a cookie will be set on your browser. We have to maintain the cookie on your browser and all potential linked browsers in order to recognize you as having opted out from our service. You must opt out again if you clear that cookie from a browser, use a non-linked browser, or use a new device to access the internet. Please note that on certain browsers such as Safari, clearing web site data can also erase opt out information and will therefore require you to opt out again from our services.

Please note that if you are using an ad-blocker you may have to pause blocking or whitelist our website.


Safari 11.2 and above

If you do not want to receive ads displayed by Zebestof on a Safari browser above 11.2, you can enable the “Limit Ad Tracking” and “Ask websites not to track me” options on your device settings to disable our services (for Safari versions 11.1 and below, you can opt-out of Zebestof services as indicated above in this section).

  • To enable the “Limit Ad Tracking” option, you can go to the Advertising section of the Privacy settings of your device and turn on the “Limit Ad Tracking” option.
  • To enable the “ask websites not to track me” option, you can go to the Safari section of your device’s general settings and turn on the “ask websites not to track me” option.

Enabling these options will disable Zebestof ads and data collection both in the web environment as long as these options remain enabled. Your choice will be effective as soon as we recognize your device on our partners network.

Please note that if you update the browser or operating system of your device, or if you deactivate the “Limit Ad Tracking” or “ask websites not to track me” options, we may no longer be able to know that you have opted out.


7) Changes to our privacy policy

Please note that we may update or change this privacy policy. If we revise our privacy policy, we will post those changes to this privacy statement, and to other places we deem appropriate, so that you are aware of what information we collect, how we use it, and under what circumstances, if any we disclose it. If we make any material changes we will notify you by means of a notice on this site prior to the change becoming effective. Please click here for the latest version of the privacy policy.

Last updated : 17/04/2018


8) Contact Us

Upon request, Zebestof will provide you with information about whether we hold any of your personal information. You may access or request deletion of your personal information by contacting us as described below. We will respond to your request within a reasonable timeframe.

For any questions on this Privacy Policy or our data practices, you can contact Zebestof :


By email:, or

By mail: DPO-ZEBESTOF – 94 rue de Provence -75009 Paris – France.