Frequently Asked Questions How Do Quantcast Services Work?
If you choose to opt-out of our services, Quantcast will set a third-party “opt-out” cookie on your browser. The “opt-out” cookie will appear as “qoo” in the quantserve.com domain. The value of the “qoo” cookie will be set to a non-unique value, such as “OPT_OUT”. The presence of the cookie in your browser tells us you have opted-out. For more information on opting-out, please consult our opt-out page here. The only way we know if your browser has opted out is by the presence of the “qoo” opt-out cookie. If you delete this cookie, we will not know that you have opted out, and will no longer treat your browser as an “opted-out” browser. After you have opted-out, other cookies may remain in your browser, such as the “d” cookie (described above). When you opt-out, the d-cookie is set to a value that removes your cookie from some retargeting lists. Other cookies, such as first-party cookies, set in the publishers’ domains, may also remain in your browser.
Under European privacy law, personal data is any data that is or can be associated to an individual (such as a website or app user) enabling that individual to be singled out. For example, personal data includes ‘identified’ personal data such as names, usernames, passwords and contact information. It also includes ‘identifiable’ data such as online identifiers like cookie identifiers, device IDs and IP addresses.
Under the laws of countries outside of Europe, Quantcast may not always be regarded as collecting personal data.
Quantcast uses the information collected via the Quantcast tags, SDKs, and cookies to provide the Quantcast Measure and Advertise products.
The Quantcast Measure product helps website and app owners to understand the characteristics and demographics of the people who visit their sites and use their apps. The Quantcast Advertise product allows businesses to deliver relevant online advertising to individual users. For companies that want to advertise online, the Advertise product helps get their ads in front of the people that are most likely to find them interesting. This is also helpful to users who are provided with ads that are most useful and relevant to their interests.
We have aspired to build the Quantcast Measure and Advertise products with privacy principles such as the data minimization principle in mind, and we are committed to being transparent with users about how we collect and process their personal information.
In short, under European privacy law, the controller is the party who determines the “why” and “how” of the processing of personal data. The controller controls and is responsible for this data. An example of a controller is an employer who controls personal data about its employees.
On the other hand, a processor merely holds or processes the personal data on the instructions of the controller. The processor does not exercise responsibility for or control over the personal data. An example of a processor would be a payroll company that processes employee payroll data on behalf of an employer (controller), but has no ability to use the data for any other purposes.
The complexity of the audience measurement and real-time advertising business means that it can often be difficult to identify the role that each actor plays. However, for the purposes of European privacy law, the determining factor in identifying a controller will be the factual reality surrounding the processing of the personal data. In providing the Measure and Advertise products, generally Quantcast is acting as the controller of any personal data it processes as it generally determines the “why” and “how” of processing.
For example, for data processed by each of these two products, Quantcast designs the cookie that is set and determines both the cookie’s expiration date and how the cookie operates. In addition, when we receive data via cookies and tags, we use that data to train our algorithms to improve our services generally. Therefore, Quantcast is the controller of the data it collects via its cookies.
Our partners such as website operators and mobile application developers are considered autonomous controllers insofar as they collect personal data from users for their own purposes. We do not jointly control the personal information collected via the Measure and Advertise products with our partners.