A web server provides media content for playback on client devices that is associated with a set of enhanced features. When enabled, each enhanced feature provides functionality associated with and supplemental to the media content. The web server performs a handshake with each of a plurality of client devices to authenticate a communication channel. The web server enables one or more of the enhanced features while delivering media content for playback on a first device if information exchanged in the handshake with the first device satisfies a first criterion. The web server delivers the media content for playback on a second device, without enabling any of the enhanced features, if information exchanged in the handshake with the second device does not satisfy the first criterion.