Known as Silverpush, the software is designed to monitor consumers’ television use through the use of “audio beacons” emitted by TVs, which consumers can’t hear but can be detected by the software. The letters note that the software would be capable of producing a detailed log of the television content viewed while a user’s mobile device was turned on for the purpose of targeted advertising and analytics.

Source: FTC Issues Warning Letters to App Developers Using ‘Silverpush’ Code | Federal Trade Commission