Disclosed are a method, a device and a system of generation of a modified digital media file based on a encoding of a digital media file with a decodable data such that the decodable data is indistinguishable through a human ear from a primary audio stream. In one embodiment, a method of an audio encoding system includes validating a user of the audio encoding system as a publisher, associating a response action to a message of the user, the response action is at least one of a call-back action, a web-form action, and a resource-page redirect action using a processor and a memory, generating a unique identifier through a hash function applied to the response action associated with the message of the user, encoding a digital media file associated with the message with a decodable data using the unique identifier such that the decodable data is indistinguishable from a primary audio stream through a human ear, and generating a modified digital media file associated with the digital media file based on the encoding of the message with the decodable data such that the decodable data is indistinguishable from a primary audio stream through the human ear.