Watermark Client Access Control for Broadcast Data
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Solution Overview
Problem
Current broadcast communication systems lack clear security models for managing access to watermark data by resident applications in media receiver devices, particularly in scenarios where broadband connectivity is intermittent or not configured properly, leading to limitations in information retrieval and access control policies.
Innovation Solution
A watermark client on the media receiver device determines eligible resident applications to access watermark data by using a whitelist based on URL matching, application origin, and application manifests, allowing dynamic permission management without the need for explicit policies, leveraging broadcast channels to construct access policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If watermark data is embedded in broadcast streams to enable direct content delivery to end users, then content providers can deliver information without broadcaster interference, but security models for managing access to watermark data by resident applications are lacking
Solution Approach 1:
The system performs preliminary actions by embedding authorization codes and URL information in watermark data before broadcast, and pre-establishing security policies that define which applications can access watermark data. This allows the system to proactively manage access control rather than reactively handling security issues when applications attempt to access watermark data.
Solution Approach 2:
The patent introduces an intermediary security layer between the watermark data and resident applications. This intermediary validates application eligibility based on stored policies, URL matching, and application origin verification, thereby mediating access control without requiring direct trust between content providers and all applications.
2Quantity of substance
If broadband connectivity is required for data retrieval, then comprehensive data can be obtained, but access fails in scenarios where broadband connectivity is intermittent or not configured properly
Solution Approach 1:
The system performs preliminary actions by embedding URL information and authorization codes directly in the watermark data during content creation. This allows the system to have data retrieval pathways prepared in advance, enabling applications to access information through multiple channels (broadband or broadcast) depending on availability, rather than requiring broadband to be pre-configured.
Solution Approach 2:
The patent implements dynamic adaptability where the system can switch between broadband and broadcast channels for data retrieval based on connectivity conditions. The watermark client can dynamically adjust its data acquisition strategy, using broadcast streams when broadband is unavailable and broadband when available, thereby maintaining data retrieval capability across varying connectivity scenarios.
3Reliability
If explicit access policies are implemented for watermark data, then security control is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary action by pre-defining security policies and authorization codes during content creation and broadcast setup. These policies are stored in advance and automatically applied when applications request watermark data, eliminating the need for complex runtime policy decision-making and reducing system complexity while maintaining security.
Solution Approach 2:
The watermark client implementation includes self-service capabilities where the system automatically verifies application eligibility, checks URL matching, and enforces access control policies without requiring external policy management infrastructure. This self-service approach simplifies the system by embedding policy enforcement directly in the watermark processing logic.
4Adaptability or versatility
If multiple applications can access watermark data, then user interactivity is enhanced, but unauthorized access risks increase
Solution Approach 1:
The patent introduces an intermediary validation layer that sits between multiple applications and the watermark data. This intermediary checks application eligibility criteria, verifies URL matching, and confirms application origin before granting access. This mediator enables multiple authorized applications to access watermark data while blocking unauthorized access attempts.
Solution Approach 2:
The system applies local quality control by implementing different access permissions for different applications based on their specific eligibility criteria. Rather than a blanket allow or deny policy, the system evaluates each application's origin, its relationship to the broadcast stream, and URL matching locally, granting access only to those that meet the specific criteria for that particular watermark data.
Data Source
Figure 1A
Figure 1B~1C
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AI summary
Methods, devices, systems, and non-transitory process-readable storage media for a watermark client executing on a media receiver device to manage access to data related to watermark data from broadcast streams. An embodiment method performed by a processor of the media receiver device may include operations for receiving a broadcast stream from a broadcast channel, identifying watermark data within the received broadcast stream, obtaining data via a wide area network based on the identified watermark data, receiving a request for the obtained data from a resident application executing on the media receiver device, and determining whether the resident application is eligible to access the obtained data.