US Patent 12073002 Enhancing user identification with privacy protection across web servers

The technology teaches limiting sharing of visitor identity information across web sites, receiving from a visited web site server in a visitor's browser a page with a privacy script that runs in the browser and interfaces with a privacy ID server and third-party apps that seek visitor identification. The privacy script running in the browser retrieves a first party cookie including a visitor ID, forwards the cookie to the privacy ID server, receives from the privacy ID server, a site-by-app-specific ID for the visited site and one of the apps, and provides respective server site-by-app-specific IDs to respective third-party apps, without providing the visitor ID to the apps, thereby allowing tracking of the visitor on repeat visits to the visited site but not facilitating identification of the visitor across sites. Site-by-app-specific IDs for the visitor are distinct and uncorrelated for among distinct pairs of the web sites and third-party apps.