Secure Multimedia Card Access Mode Management
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Solution Overview
Problem
Existing digital rights management (DRM) systems face issues with security data loss and illegal copying when connection between a host device and a secure multimedia card is interrupted during data transfer, leading to incomplete or missing data on both devices.
Innovation Solution
Implementing an access mode setting and checking mechanism using authorization and status bits to manage security data, ensuring that both devices maintain accurate records of data access and transfer status, preventing data loss and illegal copying by re-establishing the access mode upon reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If security data is transferred between host device and secure multimedia card during DRM operations, then digital content protection is enabled, but connection interruption during transfer causes data loss or illegal copying
Solution Approach 1:
The patent applies preliminary action by establishing access modes and authorization bits before security data transfer begins. The host device sets specific access modes (read, write, remove) and corresponding authorization bits in advance, so that when connection interruption occurs, the pre-established access control mechanisms can prevent data loss or illegal copying without requiring complex post-intervention protocols.
Solution Approach 2:
The patent implements feedback mechanisms through status bits that continuously monitor the state of security data access. When connection interruption occurs, the status bits provide feedback information about the current access state, enabling the host device to determine appropriate recovery actions. This feedback loop simplifies data management by providing clear state information without requiring complex error handling protocols.
2Reliability
If access control mechanisms are implemented to prevent illegal copying, then security is improved, but data access operations become more complex
Solution Approach 1:
The patent segments access control into distinct access modes (read mode, write mode, remove mode), each with its own authorization bit and status bit. This segmentation allows simple, mode-specific operations rather than complex permission checks for each data access request. The host device and secure multimedia card can operate with straightforward mode-specific commands while maintaining robust security through the segmented access control structure.
3Reliability
If security data is encrypted and protected with authorization mechanisms, then copyright protection is enhanced, but data management and transfer between devices become more difficult
Solution Approach 1:
The patent implements self-service mechanisms where the secure multimedia card autonomously manages its own security data using the established access modes and authorization bits. When the host device initiates a security data transfer with a specific access mode, the secure multimedia card automatically verifies the corresponding authorization bit and executes the operation without requiring complex host-side verification protocols. This self-service approach simplifies inter-device data management while maintaining strong copyright protection.
Data Source
AI summary
An apparatus and method are provided for securely managing security data between a host device and a secure multimedia card. A host device includes an access mode setting unit which sets an access mode for security data that is stored in a secure multimedia card, a transmitting and receiving unit which transmits an access request message that includes the set access mode, and an access information managing unit which receives, if connection between the host device and the secure multimedia card is separated, access information stored in the secure multimedia card, and compares the access information.