Client Device Entitlement Message Comparison for Automatic Reset
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Solution Overview
Problem
Client devices with stored content and encryption keys from one subscriber or network fail to function correctly when redeployed to another subscriber or network, requiring physical intervention and potential costly maintenance, especially when a 'factory reset' is overlooked.
Innovation Solution
A system and method that reconfigures client devices by receiving and comparing entitlement messages with stored credentials, triggering a reset procedure when a new subscriber or network identifier is detected, ensuring secure and automatic reauthorization without manual refurbishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a factory reset is applied to the client device when redeployed, then the device can function correctly on the new network, but physical local intervention is required which increases maintenance cost and time
Solution Approach 1:
The client device automatically detects when it has been redeployed to a new network by comparing the incoming EMM's network identifier with its stored credentials, and autonomously triggers a factory reset without requiring physical intervention. This self-service mechanism eliminates the need for maintenance personnel to manually reset devices during redeployment.
Solution Approach 2:
The system implements a feedback loop where the client device continuously monitors incoming EMM messages for network identifier changes, compares them against stored credentials, and automatically initiates reset procedures when a mismatch is detected. This closed-loop feedback ensures the device adapts to new networks without external intervention.
2Reliability
If a factory reset is applied to the client device when redeployed, then the device can function correctly on the new network, but the reset can be forgotten resulting in costly maintenance operations
Solution Approach 1:
The client device is pre-configured with credentials including network identifiers during initial provisioning. Before processing EMM messages on a new network, the device automatically compares incoming network identifiers against stored credentials and performs the reset action in advance, ensuring readiness before content delivery begins. This preliminary action prevents delays and forgotten resets.
3Adaptability or versatility
If the client device stores credentials and content history locally, then the device can operate on a single network, but the device cannot function correctly when moved to another network or subscriber
Solution Approach 1:
The client device dynamically adjusts its operational state based on network identification. When the device detects a network identifier mismatch between incoming EMM messages and stored credentials, it automatically transitions to a reset state, clearing local content history and credentials. This dynamic adaptation allows the device to maintain reliability across different networks and subscribers.
Data Source
AI summary
The systems and method disclosed herein address introduce identifiers within the individual entitlement management messages (EMMs) addressed to that client that uniquely identify the combination of system and subscriber account to which the client is deployed, and use of them to issue automatic ‘factory reset’ behavior when the client is re-authorized for the new subscriber. In one embodiment, the EMM messages used to trigger the reset behavior are cryptographically signed specifically for the individual client to ensure that such a message cannot be maliciously sent by an untrusted third party. The facility to deliver such a message is already available within the conditional access system (CAS).