| 摘要 |
A video on demand (VOD) method, consistent with the invention involves storing multipleselective encrypted VOD cotnent on a VOD server; receiving an order for the VOD contentspecifying delivery to a target decoder; determining what CA encryption system is associatedwith the order; stripping all encrypted segments from the multiple selectively encrypted contentthat are not associated witht he order to produce single selectively encrypted VOD content tothe target decoder. The multiple selectively encrypted VOD content can be created by examining unencrypted data representing digital content to identify segments of content for encryption; encrypting the identified segments fo content using a first encryption method associated with a first conditional access system to produce second encrypted segments; and replacing the identified segments of content witht he first encrypted content and the second encrypted content in the digital content, to produce the multipe selectively encrypted VOD content.
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