Content Playback Apparatus Key Generation for Virtual Package Assembly
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Solution Overview
Problem
Existing content playback systems for virtual packages fail to ensure that all components of a virtual package are assembled as intended by the creator, leading to potential unauthorized playback and copyright protection issues, as parts of the package can be played without the complete set of elements.
Innovation Solution
A content playback apparatus that decrypts encrypted content only when the second key is obtained using information recorded on a recording medium, ensuring that the virtual package is assembled correctly, using a key generation unit to generate a third key from key generation information based on a second key, and a decryption unit to decrypt the content using this third key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital content is encrypted and protected using existing copyright protection techniques, then copyright protection is improved, but the ability to play partial content without the complete virtual package is enabled
Solution Approach 1:
The patent segments the copyright protection mechanism into two independent parts: (1) content encryption using a first key stored on the recording medium, and (2) key generation using a second key obtained from external key generation information. This segmentation allows the content to be encrypted for protection while the key generation process ensures that only complete virtual packages can be decrypted and played, preventing unauthorized partial playback.
Solution Approach 2:
The patent introduces key generation information as an intermediary element between the content encryption and decryption processes. The first key encrypts the content, but the second key (obtained through key generation information from external sources) is required to generate the actual decryption key. This intermediary mechanism ensures that both components of the virtual package must be present and properly assembled to enable playback, thereby preventing unauthorized access while maintaining copyright protection.
2Ease of operation
If content is encrypted with a first key stored on the recording medium, then decryption capability is provided, but the system cannot verify whether the virtual package is assembled correctly
Solution Approach 1:
The patent applies preliminary action by requiring the user to obtain key generation information from external sources before the actual decryption can occur. The system pre-arranges that the second key must be generated through a specific process using external key generation information, ensuring that the virtual package is assembled correctly before decryption is permitted. This preliminary verification step ensures proper package assembly while maintaining ease of operation for authorized users.
3Ease of operation
If a simple encryption scheme is used, then ease of playback is maintained, but copyright protection is insufficient against unauthorized copying
Solution Approach 1:
The patent extracts the copyright protection function from the content itself and places it in the key generation process. The content is encrypted with a first key that can be easily obtained from the recording medium, maintaining ease of playback. However, the second key required for decryption is extracted from external key generation information, creating a stronger protection mechanism that prevents unauthorized copying while maintaining user convenience for authorized playback.
Data Source
AI summary
A content playback apparatus prevents related content recorded on separate media that make up a virtual package from being played separately, thereby restricting playback of the content to only when the virtual package is assembled as intended by the creator, and protecting copyright of the content. A key obtaining unit obtains a second key, with use of key management information recorded on a recording medium on which related content relating to the encrypted content is also recorded. An information obtaining unit obtains the encrypted content and key generation information that relates to generation of the first key, from a source other than the recording medium. A key generation unit generates the first key with use of the second key and the obtained key generation information. A decryption unit decrypts the encrypted content with use of the first key.