Optical Disc Copyright Protection via Unique Sub-Information

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Solution Overview

Problem

Current information recording and reproducing systems face challenges in securely protecting copyrighted content, as existing methods are vulnerable to illegal reproduction and copying, particularly when illegitimate devices ignore verification processes or lack essential encryption keys.

Innovation Solution

The system generates and records second sub-information unique to each information recording medium, distinct from main and first sub-information, using stamper unique information and disc identification information, making it difficult to reproduce content without legitimate access and enhancing copyright protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If content information is recorded based on media identifiers that differ for each information recording medium and content identifiers, then copyright protection is improved, but it becomes impossible to record content data which should be common for each stamper

Engineering Contradiction:

Improvecopyright protectionVSAvoidcontent data commonality

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent segments information into three distinct types: main information (content data), first sub-information (encryption keys), and second sub-information (verification data). This segmentation allows common content data to be recorded across multiple media while maintaining unique verification mechanisms for each medium, resolving the contradiction between copyright protection and content commonality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary verification mechanism using second sub-information that is generated based on both stamper unique information and medium unique information. This intermediary element enables the system to verify copyright protection while allowing the same main information to be reproduced across multiple media from the same stamper.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If computation values of medium identification information are used for copyright protection, then reproduction control is improved, but the system becomes vulnerable to illegal reproduction when verification processes are ignored

Engineering Contradiction:

Improvereproduction controlVSAvoidillegal reproduction vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-recording second sub-information on each information recording medium during the manufacturing process. This verification data is prepared in advance and embedded in the medium, enabling the reproducing device to perform verification before reproduction occurs, thereby preventing illegal reproduction attempts.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the reproducing device reads the second sub-information from the medium, verifies it against the main information and first sub-information, and based on this verification result, determines whether to permit reproduction. This closed-loop feedback system significantly reduces vulnerability to illegal reproduction.

Inventive Principle:

Principle #23Feedback

3Reliability

If individual keys are recorded in each stamper for encryption, then copyright protection is improved, but manufacturing efficiency decreases as only one optical disc can be manufactured per stamper

Engineering Contradiction:

Improvecopyright protectionVSAvoidmanufacturing efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent makes the stamper universal by recording second sub-information that is generated based on both stamper unique information and medium unique information. This allows a single stamper to manufacture multiple optical discs, each with individual verification capabilities, thereby maintaining copyright protection while significantly improving manufacturing efficiency.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the parameter of verification data by generating second sub-information that incorporates both stamper unique information (constant across multiple discs) and medium unique information (variable for each disc). This parameter change enables multiple discs to be manufactured from one stamper while maintaining individual verification and copyright protection.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8254233B2Information recording device, information reproducing device, and information recording medium

Publication Date: 2012.08.28 PANASONIC HOLDINGS CORP

AI summary

An information recording device, an information reproducing device, and an information recording medium securely protect copyright of main information, and prevent illegal access to the recorded main information. The information recording device includes a medium unique information generating section that generates second sub information by data-converting stamper unique information based on disc identification information that differs for each optical disc after transferring main information and first sub information from a stamper having the main information and the first sub information recorded thereon onto an optical disc, and a medium unique information recording section that records the second sub information on the optical disc having recorded thereon in advance the main information and the first sub information in a form different from the forms of the main information and the first sub information.