1. A method, comprising a receiving device: sending, to an intermediate server device, a request to deliver content identified by a notification received from the intermediate server device; sending, to the intermediate server device, one or more messages that are indicative of installed software of the recipient device that the recipient device uses to protect the content; and receiving the content, from the intermediate server device, if the one or more messages are indicative of software trusted to enforce a content policy associated with the content.