Abstract: Methods and apparatuses that maintain one or more data stores capable of storing local data in a device for loading a resource of a domain are described. The resource may be loaded to cause one or more data access operations on the data stores. Access to usage tracking data of the device from the domain may depend on at least one of the data access operations. The data access operations may be configured to block the usage tracking data of the device from the domain. The data access operations may be performed on the data stores for the loading of the resource. A web page may be presented to a user when the resource is successfully loaded.

Abstract: Methods and apparatuses that collect tracking data items into a plurality of data stores for one or more domain in response to resources received from the domains are described. Each tracking data item may be accessible for one of the domains. Relationships of the domains may be identified among the tracking data items across multiple data stores according to the resources received. One or more of the domains may be selected according to the identified relationships to control accessibility of the tracking data items for the domains. The data stores may be updated to prohibit accessing at least a portion of the tracking data items for the selected domains.