Digital Work Protection via Device-Specific Encryption
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Solution Overview
Problem
Digital works distributed over networks face challenges in copyright infringement due to easy replication, necessitating a solution to restrict playback to authorized devices.
Innovation Solution
A digital work protection system that employs a portable recording medium with unique device information for encryption and decryption, ensuring that digital content can only be played back on the device used for recording, and includes usage condition management to limit playback permissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If digital works are distributed over a network for easy access and replication, then user convenience is improved, but copyright infringement increases
Solution Approach 1:
The system segments the digital work into encrypted data stored on the portable recording medium and device-specific unique information stored in the record/playback device. This segmentation allows the content to be distributed widely while maintaining protection through device-specific encryption keys, resolving the contradiction between ease of access and copyright protection.
Solution Approach 2:
The patent introduces an intermediary encryption mechanism that acts as a mediator between the digital work and the record/playback device. The encryption unit and decryption unit serve as intermediaries that enable authorized playback while preventing unauthorized access, thus maintaining both user convenience and copyright protection.
2Reliability
If device unique information is stored in the record/playback device for encryption, then playback protection is improved, but device complexity increases
Solution Approach 1:
The system creates a copy of the unique information in the form of encrypted data that can be transferred to the portable recording medium. This copying approach allows the protection mechanism to be maintained without requiring complex hardware modifications, as the encryption information can be replicated and stored externally.
Solution Approach 2:
The patent changes the parameter of information storage from internal device memory to external portable medium. By transforming the storage location and format of unique information, the system maintains playback protection while reducing the complexity burden on the record/playback device itself.
3Object-affected harmful factors
If encrypted information is stored on portable recording medium for device-specific playback, then copyright protection is improved, but ease of operation deteriorates
Solution Approach 1:
The record/playback device performs self-service by automatically handling the encryption and decryption processes. When the device reads from the portable recording medium, the decryption unit automatically decrypts the information using the stored unique information, eliminating the need for manual intervention and maintaining ease of operation while ensuring copyright protection.
Solution Approach 2:
The system merges the encryption function and decryption function into an integrated system that operates transparently. The encryption unit and decryption unit work together to automatically protect and restore content, combining security measures with user-friendly operation without requiring separate manual steps.
Data Source
AI summary
A system includes of a main device and a recording medium device. The main device includes a reception unit that receives a digital work from an external distribution server, an internal storage area for storing the digital work, a playback unit that plays back the digital work, and a unique information storage area for storing information that is unique to the main device. The main device also includes an encryption unit that encrypts the digital work using the unique information, a decryption unit that decrypts, using the unique information, the encrypted digital work having been read from the recording medium device, a write unit that writes the encrypted digital work into the recording medium device which is portable, and a read unit that reads the encrypted digital work from the recording medium device.