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Content Protection System with Public Key for Video-on-Demand

IP.com Disclosure Number: IPCOM000015596D
Original Publication Date: 2002-Mar-24
Included in the Prior Art Database: 2003-Jun-20
Document File: 6 page(s) / 100K

Publishing Venue

IBM

Abstract

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.

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Content Protection System with Public Key for Video-on-Demand

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.

Finally, for the end-users, the content protection scheme should be transparent and easy to use.

This disclosure invents a new content protection system in order to protect the digital media contents for a distributed media-on-demand system. This system uses public key encryption algorithm. The mentioned issues would be well solved with this system.

This system supports multicast distribution in VOD, which can reduce the workload of VOD servers. Peer-to-Peer copy protection is also enabled. Simple file copy will be useless to infringe this system. The simplicity of this system also makes VOD system designer easier to implement.

This system consists of 6 major participants, they are:
1. Content owner. Content's copyright owner.
2. VOD server. The server which provides VOD service to the end users.
3. End user. The user who demands for videos.
4. User's devices. The content playback device used by end user, including both hardware and software.
5. Device manufacturers. The manufacturers who produced these devices.
6. Device authority. An authorized organization who can enforce the agreement on content

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protection between itself and device manufacturers and is trusted by both users and content owners.

The processing of content distribution can be divided into 3 parts, described as below:

Distribution Process of Content

The process of content distribution is shown in the following figure:

VOD Server

Encrypted Content

Encrypted Content

Encrypted Content

Encrypted Content

Encrypted Content

End User

Content Owner

End User

End User

Content Owner

End User

VOD Server

Encrypted Content

Encrypted Content

Encrypted Content

Encrypted Content

Encrypted C...