Abstract: A method for digital data distribution or broadcasting that takes advantage of non-deterministic (or “opportunistic”) unused bandwidth in dynamically optimized broadband digital broadcast systems. Digital data files received from broadcasts are stored in mass storage devices for viewing at a later time at high speed, overcoming “last mile” narrow bandwidth issues. Instead of reserving a particular communications channel or data transfer spectrum, data is opportunistically “piggybacked” onto unrelated broadcasts, using otherwise unused bandwidth within existing broadcast channels or spectrums. The broadcast source does not target the digital files at specific identifiable users or broadcast contents based on their interactive requests. Data broadcasting in accordance with the present invention may be implemented to work with any medium which allows the delivery of large files in a one-to-many fashion (i.e.