Content Use Control via Certificate Revocation List Timestamp Verification
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Solution Overview
Problem
Existing content distribution systems face challenges in managing and controlling the use of contents obtained through Electric Sell Through (EST) and Manufacturing on Demand (MoD), particularly in preventing unauthorized use and ensuring copyright protection when contents are downloaded or recorded using shared terminals, as it becomes difficult to manage a large number of content providers.
Innovation Solution
An information processing apparatus and method that utilizes a certificate revocation list (CRL) to verify the validity of content-owner certificates and content certificates, comparing timestamps to determine if the content use should be restricted or prohibited, thereby ensuring that only valid content is used and preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If content is provided through download or shared terminal without strict provider management, then content accessibility and distribution flexibility are improved, but copyright protection and use control reliability deteriorate
Solution Approach 1:
The patent introduces a certificate authority (CA) as an intermediary that issues certificates to content providers and a verification mechanism that checks these certificates against a revocation list. This intermediary system enables flexible content distribution through multiple providers while maintaining reliable copyright protection through centralized certificate management and verification.
Solution Approach 2:
The patent implements preliminary verification of content provider certificates against a revocation list before content is distributed or accessed. By checking the validity of certificates in advance and maintaining a list of revoked certificates, the system ensures that only authorized providers can distribute content, thereby maintaining copyright protection reliability while allowing flexible distribution channels.
2Reliability
If certificate verification against revocation list is implemented, then copyright protection and use control are improved, but system complexity and processing time increase
Solution Approach 1:
The patent extracts the certificate verification functionality into a separate, modular component that operates independently from the main content distribution system. The verification module takes content provider certificates and revocation lists as input, performs the verification, and returns a validity result. This extraction reduces system complexity by isolating the verification logic while maintaining reliable use control.
3Measurement precision
If timestamp comparison is performed between content certificate and CRL, then accuracy of content validity determination is improved, but processing time increases
Solution Approach 1:
The patent implements a two-stage verification process: first, a quick check whether the content provider's certificate exists in the revocation list (partial verification), and second, a more thorough timestamp comparison to determine exact validity period (excessive verification). This approach achieves high accuracy in validity determination while minimizing processing time by performing the simpler check first and only proceeding to the more time-consuming comparison when necessary.
Data Source
AI summary
An information processing apparatus for controlling use of a content recorded on a disc. The information processing apparatus includes: in reference to a certificate revocation list including invalidation information of a content owner providing the content, a data verification section verifying whether content-owner identification recorded in a content-owner certificate recorded on the disc as a certificate corresponding to the content owner is included in the certificate revocation list, and if included, the data verification section comparing a content-certificate time stamp which is stored in the content certificate recorded on the disc as a certificate corresponding to the content and a CRL time stamp which is invalidation date-and-time information corresponding to the content owner stored in the certificate revocation list; and a content-use control section prohibiting or restricting use of the content if the content-certificate time stamp has date-and-time data not earlier than the CRL time stamp.