A server receives a message from a subscriber. The message includes a subscriber identifier and one or more one or more first identifying attributes associated with a first media-work played-out by the subscriber. The server performs a first-level match between the first identifying attributes and unique identifiers included in a database. In response to the first-level match indicating that the first identifying attributes do not include any of unique identifiers, the server performs a second-level match, which compares the first identifying attributes to content attributes of different media-works linked to the unique identifiers. In response to the second-level match identifying one or more matching first identifying attributes to the content attributes that are linked to a particular unique identifier included in the database, the server selects enhanced content based on the particular unique identifier, and delivers that enhanced content to the subscriber.