RAID Disk Controller Signature Verification for Piracy Prevention
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Solution Overview
Problem
Existing RAID systems face challenges in preventing piracy while allowing for the free distribution of device driver software, as strict control measures are costly and inconvenient, especially when multiple versions of hardware and software need to be managed.
Innovation Solution
A method where a disk controller initializes by writing a signature to a scratchpad register indicating authorized product features, and only allows access to features matching this signature, ensuring that unauthorized use is prevented without restricting the distribution of device driver code.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strict control measures are implemented to prevent piracy of device driver software, then piracy prevention is improved, but distribution convenience and user flexibility deteriorate
Solution Approach 1:
The device driver is segmented into two parts: a kernel module that loads freely, and a feature authorization module that checks hardware signatures. This segmentation allows free distribution while preventing unauthorized feature access, resolving the contradiction between piracy prevention and distribution convenience
Solution Approach 2:
A signature stored in the hardware device acts as an intermediary between the device driver and authorized features. The driver checks this signature to determine permitted operations, enabling piracy prevention without restricting distribution of the driver code itself
2Adaptability or versatility
If multiple versions of hardware and software are produced to offer different feature sets, then product adaptability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
A single device driver is made universal by incorporating signature-checking capability that works with multiple hardware versions. The driver adapts to different feature sets by reading hardware signatures rather than requiring separate driver versions, reducing manufacturing complexity while maintaining product adaptability
Solution Approach 2:
The system uses signature parameters stored in hardware to dynamically determine which features are authorized. Rather than producing multiple hardware/software versions, the system changes the signature parameter to control feature access, simplifying manufacturing while maintaining versatility
Data Source
AI summary
An apparatus, computer program product, and method for preventing piracy in combined hardware/software products, and specifically in RAID storage systems is disclosed. In a preferred embodiment of the present invention, when a hardware device (a disk controller, in a preferred embodiment) is initialized, the device executes firmware that directs it to write a signature to a storage location (scratchpad register) in the device, where the signature corresponds to a set of product features authorized for use with the hardware device. When application code executing on the host computer system attempts to access a feature (e.g., through device driver code), the stored signature is read from the hardware device. The code implementing the feature is allowed to execute only if the signature that is read from the hardware device matches a feature level of the product in which that feature is authorized.