This invention discloses a secure recording medium having at least one of audio, video and software content, comprising a plurality of media recording disks (DVD's) with a disk security chip embedded in each the DVD, each the disk chip comprising a security key, wherein at least two of the DVD's have different disk security keys. A method for protecting access to content recorded on a media recording disk (DVD) is also disclosed.

 
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< Speed enhanced cryptographic method and apparatus

< Optimized enveloping via key reuse

> System for controlling the distribution and use of rendered digital works through watermarking

> Method of authenticating information, disk playback apparatus, and entertainment apparatus

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