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Content Protection System with Public Key for Video-on-Demand Disclosure Number: IPCOM000015596D
Original Publication Date: 2002-Mar-24
Included in the Prior Art Database: 2003-Jun-20

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A flexible and reliable content protection scheme is crucial to the success of a Video-on-Demand system, or generally Media-on-Demand system. However how to design a secure and flexible content protection scheme which is not only applicable for traditional VOD system, but also for novel distributed VOD system in multicast, even peer-to-peer environment is still an open question. For a practical content protection scheme in VOD system, the benefits of all the participants on the value chain from content owner to VOD service provider to end user should be concerned. Firstly, for the content owners, the content protection scheme should enable them to distribute their content freely and securely to the variable service providers with an easy way to manage. Secondly, for the service provider, who appears as the content distributor, the content protection scheme should provide an alternative way to licensing all the content from content owner because it would cost too much and hard to manage. In addition, the content protection scheme should prevent the service provider from encrypting all the content again and again for different end-users’ request because the content is too huge and the process of encrypting them is time-consuming.