A. Permutive uses an AppNexus ID to match users to third-party audiences
While Permutive doesn't rely on third-party cookies, you are still able to build segments using third-party audiences. Furthermore, the Insights module uses third-party data to power the 'Third-Party Index' tab, which allows you to see third-party insights into your audiences.
If a user has an AppNexus ID in their browser when they visit a site where Permutive is deployed, Permutive uses this ID in order to match users to these third-party data audiences.
For more information around how AppNexus collects, uses and shares AppNexus IDs, click here.