Content Playback Device Mode Management via Deprecated State
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Solution Overview
Problem
Content owners face challenges in managing circumvented content playback devices, as TPM updates may not be supported by all devices, leading to difficulties in preventing unauthorized use, and revocation is an extreme measure that may not be effective.
Innovation Solution
Implementing a 'deprecated mode' that reduces the quality of content output until a TPM update is verified, allowing devices to transition back to full mode once updated, thereby providing a middle ground between updating and revoking devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TPM update is implemented to fix circumvention, then content protection is improved, but device compatibility deteriorates because not all devices support the update
Solution Approach 1:
The system dynamically adjusts the operational mode of playback devices based on their TPM status. Devices transition between full mode, deprecated mode, and revoked mode depending on whether they have circumvented TPMs and whether updates are applied, allowing the system to adapt protection strategies to individual device capabilities rather than applying a static update to all devices
Solution Approach 2:
The system changes the operational parameters of devices by implementing different modes (full mode, deprecated mode, revoked mode) that alter content processing and output capabilities. This allows the system to modify device behavior and protection levels without physically changing the devices or requiring universal TPM updates
2Reliability
If device revocation is implemented to prevent unauthorized use, then content protection is improved, but consumer convenience deteriorates
Solution Approach 1:
The system implements dynamic mode transitions that allow devices to move between full mode, deprecated mode, and revoked mode. This dynamic approach provides consumers with gradual transitions and opportunities to update TPMs rather than immediate revocation, maintaining convenience while improving protection
Solution Approach 2:
The system takes preliminary action by placing devices in deprecated mode before final revocation, providing a warning period and opportunity for TPM updates. This preliminary deprecation phase allows consumers to prepare and update their devices, avoiding sudden loss of functionality
3Adaptability or versatility
If deprecated mode is implemented as middle ground, then device management flexibility is improved, but system complexity increases
Solution Approach 1:
The system segments device operation into distinct modes (full mode, deprecated mode, revoked mode) with clearly defined characteristics and transitions. This segmentation simplifies management by creating discrete states rather than continuous adjustment, making it easier to track and manage device status across the ecosystem
Data Source
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AI summary
Managing modes of a content playback device for playing back content including: receiving, from a licensing authority, at least one of: a deprecation message used to transition the content playback device from a full mode to a deprecated mode; a patched message used to transition the content playback device from the deprecated mode to the full mode; and a revocation message used to transition the content playback device from the full mode or the deprecated mode to a revoked mode; outputting a first set of features of the content when the content playback device is in the full mode; outputting a second set of features of the content reduced from the first set of features when the content playback device is in the deprecated mode; disabling all features of the content so that nothing is output when the content playback device is in the revoked mode.