Abstract: A network computer system provides logic to cause a client compute device to perform operations in connection with the client compute device rendering a publisher's webpage. The operations performed by the client compute device include retrieving rules from a collection of rules, each rule of the collection being associated with at least one of a plurality of third-party digital content identifiers, each third-party digital content identifier uniquely identifying a corresponding third-party digital content; detection of execution of a third-party tag on the client compute device, including identifying a digital content identifier that is utilized in execution of the third-party tag; matching the digital content identifier of the executing third-party tag to one of the retrieved rules; and implementing a security or compliance operation with respect to the third-party tag based at least in part on the matched rule.