Block-Based Content Transmission for Secure Copy Control
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Solution Overview
Problem
Conventional content copy control systems are insecure and incomplete, as they rely on single identification information reads, are vulnerable to data manipulation, and fail to accurately count copy numbers during interrupted transfers.
Innovation Solution
A content transmitting apparatus and receiving apparatus that transmit and record digital copyrighted content in blocks, accompanied by copy control information, content identification information, and status information, ensuring secure copy control by repeating permission judgments and using validity flags to verify data integrity and completeness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single identification information read is used for copy control, then the system is simple to operate, but the copy control security is insufficient
Solution Approach 1:
The content transmission is divided into multiple content blocks, with copy control information, content identification information, and content status information transmitted separately for each block. This segmentation allows the receiving apparatus to verify each block independently, preventing unauthorized copying even if some information is captured or modified during transmission.
Solution Approach 2:
The transmitting apparatus preliminarily prepares and transmits copy control information, content identification information, and content status information together with each content block before the receiving apparatus performs copy permission judgment. This preliminary transmission of all necessary information enables the receiving apparatus to make accurate copy permission decisions without needing to request additional information later.
2Measurement precision
If copy number is counted at the head part of copying, then the copy control is simple, but incomplete copies are incorrectly counted as complete copies
Solution Approach 1:
The transmitting apparatus transmits content status information for each content block, providing feedback to the receiving apparatus about the copying progress. The receiving apparatus uses this feedback to monitor whether copying is complete by checking if all content blocks have been successfully received and verified, ensuring accurate copy number counting only when copying is truly complete.
Solution Approach 2:
The patent replaces the simple mechanical counting approach (counting at head or end) with an information-based verification system. The transmitting apparatus provides content status information that allows the receiving apparatus to verify completion through information validation rather than simple positional counting, substituting a mechanical counting system with an information verification system.
3Reliability
If identification information is read once and judged, then the transmission process is fast, but the copy control becomes vulnerable to manipulation
Solution Approach 1:
The transmitting apparatus transmits copy control information, content identification information, and content status information together with each content block in advance, before any potential manipulation can occur. The receiving apparatus uses this preliminarily transmitted information to perform copy permission judgment for each block, preventing unauthorized copying by verifying information at the point of reception rather than relying on a single prior read.
4Reliability
If copy permission is judged based on single identification information, then the judgment process is simple, but the copy control is insecure against data capture and replacement
Solution Approach 1:
The content is divided into multiple content blocks, with separate copy control information, content identification information, and content status information transmitted for each block. This segmentation allows the receiving apparatus to verify each block independently, so that capture or replacement of information for one block does not compromise the security of other blocks or the overall copy control system.
Solution Approach 2:
The content status information acts as an intermediary that links the content blocks with their corresponding copy control information. This intermediary enables the receiving apparatus to verify the integrity and completeness of each content block by checking its status information, adding a layer of verification that prevents unauthorized copying even if other information is manipulated.
Data Source
AI summary
A content transmitting apparatus and the like which execute copy control of content more securely than conventional, and can count copy number correctly according to the situation, even in the case where content transfer is interrupted are provided. The content reproducing apparatus 10 for transmitting content that is digital copyrighted work including a plurality of content blocks comprises: the content reproducing unit 11 which reads out content and the like from the DVD 30; the control unit 12 which repeats, for each of the plurality of content blocks, transmitting in parallel with the content blocks, the copy control information indicating copy permission of the content, the content identification information identifying content, and the content status information indicating status of the content blocks in the overall content; the data building unit 15; the transmission unit 16; and the like.