1. An apparatus, comprising: at least one processor; and a memory including first executable instructions which, when executed, cause the at least one processor to: instruct a media provider to associated second executable instructions with media; and access data from a media device, the data sent in response to the media device executing the second instructions, the second instructions to cause the media device to: collect a media identifier indicative of media presented at the media device; encrypt a user identifier that identifies the user of the media device, the encrypting of the user identifier based on a first encryption key corresponding to a first database proprietor having first user information associated with the user identifier; encrypt a device identifier that identifies the media device, the encrypting of the device identifier based on a second encryption key corresponding to a second database proprietor having second user information associated with the device identifier; send the media identifier in association with an impression identifier to the at least one processor; send the encrypted user identifier and the impression identifier to a first server associated with the first database proprietor; and send the encrypted device identifier and the impression identifier to a second server associated with the second database proprietor.