Virtual File System Directory Name Calculation for HD UHD Content
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Solution Overview
Problem
Current systems fail to reliably distinguish and acquire the correct subsequent data for HD and UHD content from a reproducing device, leading to potential errors in content reproduction due to shared disk root certificates and hash values.
Innovation Solution
A data processing unit applies conversion functions to the root certificate configuration data to calculate unique directory names for HD and UHD content, allowing the system to selectively retrieve the appropriate subsequent data from the local storage unit, constructing a virtual file system that accurately differentiates between HD and UHD content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hash values are calculated from disk root certificates to identify subsequent data recording areas, then subsequent data can be acquired from the local storage unit, but HD and UHD content cannot be reliably distinguished because they share the same root certificate and produce identical hash values
Solution Approach 1:
The patent segments the identification process by separating the root certificate-based identification (common to both HD and UHD) from the content version identification. It introduces a new segmentation criterion: the video stream resolution characteristic. The reproducing device now identifies subsequent data by combining both the root certificate match and the resolution match, effectively segmenting the previously unified identification space into distinct HD and UHD pathways.
Solution Approach 2:
The patent adds another dimension to the identification process by introducing video stream resolution as a secondary identification criterion alongside the root certificate hash value. Instead of relying solely on the one-dimensional root certificate approach, the system now operates in a two-dimensional identification space: (root certificate, video stream resolution). This dimensional expansion allows differentiation between HD and UHD content that share the same root certificate.
2Ease of manufacture
If the same root certificate is used for both HD and UHD disks, then content authentication is simplified, but the reproducing device cannot determine which subsequent data corresponds to the mounted disk
Solution Approach 1:
The patent implements a feedback mechanism where the reproducing device actively compares the video stream's resolution characteristics against the resolution information stored in the subsequent data management information. This feedback loop ensures that only subsequent data matching both the root certificate and the video stream resolution are selected, providing a self-verifying system that automatically adapts to the mounted disk type without requiring complex manufacturing changes.
Solution Approach 2:
The patent performs preliminary action by pre-storing resolution information in the subsequent data management information during the data preparation phase. This advance preparation of resolution metadata allows the reproducing device to quickly compare and identify matching subsequent data without requiring real-time complex analysis, thereby simplifying the runtime identification process while maintaining reliability.
3Quantity of substance
If subsequent data for different content versions are stored in the same directory, then storage space is optimized, but incorrect subsequent data may be reproduced
Solution Approach 1:
The patent changes the selection parameters for subsequent data by introducing resolution-based filtering in addition to the traditional root certificate-based selection. The reproducing device now evaluates multiple parameters (root certificate hash value and video stream resolution) to determine which subsequent data to reproduce, ensuring that even when multiple versions coexist in the same storage location, the correct version is selected based on the combined parameter match.
Data Source
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AI summary
A virtual file system (VFS) is constructed by reliably acquiring subsequent data corresponding to an information recording medium from a local storage unit, and thus, data reproduction is executed. A data processing unit configured to read out and reproduce data recorded in the information recording medium, and data stored in the local storage unit which is different from the information recording medium, is provided. The data processing unit executes processing of selecting data associated with the information recording medium from the local storage unit, as reproduction target data, executes directory name calculation processing in which a conversion function corresponding to a version of the information recording medium is applied to configuration data of a root certificate recorded in the information recording medium, at the time of performing the processing of selecting the reproduction target data, and selects data which is recorded in a directory having a calculated directory name from the local storage unit, as the reproduction target data.