Content Management Server for Cross-Device Transfer
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Solution Overview
Problem
The difficulty in exchanging contents between devices of different types, such as recording medium type devices and downloading type devices, due to differences in content distribution mediums, hinders seamless content management and usage across various devices.
Innovation Solution
A content management system that employs digital signatures and a server-based verification process to authenticate recording medium and device identifiers, allowing downloading type devices to access and download contents stored on a network database if the user possesses both types of devices, ensuring secure and authorized content transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital signatures and server-based verification are implemented to enable content exchange between different device types, then content compatibility and accessibility are improved, but system complexity and security verification overhead increase
Solution Approach 1:
A server acts as an intermediary between recording medium type devices and downloading type devices. The server receives encrypted content from the former, verifies digital signatures, and distributes authorized content to the latter. This mediator approach enables content exchange between incompatible device types without requiring direct integration between them, thus improving adaptability while managing system complexity through centralized coordination.
Solution Approach 2:
The server is designed with multi-functional capabilities: it serves as a content repository, a verification authority, an encryption/decryption hub, and a distribution platform. By consolidating these functions in a single universal system, the patent avoids the need for multiple specialized systems, thereby improving content compatibility across device types while controlling overall system complexity.
2Reliability
If digital signatures are used to authenticate content and prevent unauthorized use, then security and content protection are improved, but processing time and computational overhead increase
Solution Approach 1:
Digital signatures are applied to content in advance during the encryption process at the recording medium type device. The server performs verification of these pre-applied signatures before content distribution. This preliminary application of authentication mechanisms avoids the need for repeated authentication operations during content playback or usage, thereby improving content protection while reducing processing time during actual content consumption.
3Reliability
If encryption keys are stored securely to prevent forgery, then security is improved, but key management complexity and storage security requirements increase
Solution Approach 1:
The patent extracts the key management function from individual devices and centralizes it in the server. Recording medium type devices encrypt content using keys, but the server maintains and manages the master encryption keys and verification credentials. This extraction approach improves security by creating a centralized secure vault for key management while reducing key management complexity at the device level, as devices only need to handle local encryption/decryption operations.
Data Source
AI summary
A receiver (38) receives, from a mobile device of a first type adapted to read a content from a recording medium and run the content, a first device identifier identifying the mobile device of the first type and a recording medium identifier identifying a recording medium loaded in the mobile device of the first type, along with a digital signature generated using an encryption key secretly stored in the mobile device of the first type. A signature verification unit (40) verifies the authenticity of the digital signature. A voucher issuance unit (52) issues a voucher to a mobile device of a second type adapted to acquire a content by downloading the content and to run the content accordingly and mapped into the mobile device of the first type, so that the mobile device of the second type is capable of downloading a content.