Apple Inc.
METHOD AND SYSTEM FOR ENSURING SEQUENTIAL PLAYBACK OF DIGITAL MEDIA

Abstract:

Techniques for ensuring that media playback proceeds sequentially through media content of a digital media asset are disclosed. In one embodiment, distinct portions (e.g., segments) of a digital media asset can be separately encrypted such that on playback decoded data being output from at least one prior portion can be used to derive a cryptographic key that is used in decrypting a subsequent portion of the digital media asset.