Secure Container Key File for Copyright Protection
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Solution Overview
Problem
The existing electronic music distribution (EMD) system inadequately protects copyright owners' profits, as it allows unrestricted copying of content data and lacks effective monitoring mechanisms, leading to potential loss of revenue for content providers due to unauthorized redistribution and handling of unencrypted content data.
Innovation Solution
A data providing system that manages content distribution by producing and distributing key files containing encrypted content key data and usage control policy data, allowing the data processing apparatus to decrypt and determine the handling of content data based on the decrypted usage control policy, thereby enhancing protection of copyright owners' rights and reducing monitoring load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If content data is distributed without encryption or with weak protection, then ease of operation and accessibility are improved, but copyright protection and prevention of unauthorized redistribution deteriorate
Solution Approach 1:
The system segments the content protection mechanism into multiple layers: usage control policy data is separated from content data, and the key file is divided into encrypted content key data and encrypted usage control policy data. This allows the content to be accessible while maintaining protection through the separated policy layer that controls usage rights.
Solution Approach 2:
The key file acts as an intermediary between the content data and the usage control policy. It contains encrypted usage control policy data that mediates the relationship between content providers and data processing apparatuses, enabling controlled access without direct exposure of the content to unauthorized entities.
2Reliability
If comprehensive monitoring mechanisms are implemented to protect copyright, then copyright protection is improved, but device complexity and monitoring load increase
Solution Approach 1:
The data processing apparatus autonomously decrypts the usage control policy data and determines its own handling of content data based on the decrypted policy. This self-service approach eliminates the need for complex external monitoring mechanisms while maintaining effective copyright protection through the embedded policy decisions.
Solution Approach 2:
The usage control policy data is encrypted and embedded in advance within the key file before content distribution. This preliminary action ensures that protection decisions are pre-established and automatically applied when the data processing apparatus decrypts and processes the content, eliminating the need for ongoing complex monitoring.
3Reliability
If usage control policy data is embedded in the content data, then copyright protection is improved, but ease of operation and processing complexity deteriorate
Solution Approach 1:
The system separates usage control policy data from content data by embedding the policy in the key file rather than directly in the content. This segmentation allows content to be processed independently while maintaining usage control through the separate policy layer that is applied through the key decryption process.
Data Source
AI summary
To provide a data providing system able to protect the interests of interested parties of a data providing apparatus. The content provider 101 distributes a secure container 104 storing content data encrypted using content key data, content key data encrypted using distribution key data, and encrypted usage control policy data showing handling of the content data to a SAM 1051 of a user home network 103. The SAM 1051 etc. decrypts the content key data and usage control policy data stored in the secure container 104 and determines the handling such as the purchase form and usage form of the content data based on the decrypted usage control policy data.