MMT DRM Mapping for Low-Latency ATSC 3.0 Media Samples
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Solution Overview
Problem
Existing technologies lack efficient methods for digital rights management (DRM) operations in ATSC 3.0 broadcasting systems, particularly in handling out-of-order delivery modes and low latency scenarios, which are crucial for seamless media delivery and protection.
Innovation Solution
The implementation of MPEG Media Transport (MMT) based DRM operations in ATSC 3.0 systems, where a processor identifies DRM processing information in broadcast streams, associates it with media samples, and decodes these samples based on the identified information, enabling efficient DRM management even in out-of-order delivery modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional DRM methods are used in ATSC 3.0 broadcasting systems, then media delivery can be protected, but the system cannot efficiently handle out-of-order delivery modes and low latency scenarios
Solution Approach 1:
The patent segments DRM processing information into individual information elements, each associated with a specific media sample. This segmentation allows the receiver to process DRM information for each media sample independently, enabling efficient handling of out-of-order delivery without requiring complete DRM datasets before processing individual samples.
Solution Approach 2:
The patent applies preliminary action by embedding DRM processing information in advance within the broadcast stream itself, rather than requiring separate DRM operations. The DRM processing information is prepared and included with each media sample during encoding, allowing immediate processing upon receipt without additional latency.
2Productivity
If DRM processing information is embedded with each media sample, then out-of-order delivery can be handled efficiently, but the broadcast stream complexity increases
Solution Approach 1:
The patent merges DRM processing information directly with corresponding media samples within the same broadcast stream. By combining the media data and its associated DRM information into a unified structure, the system eliminates the need for separate DRM data transmissions and simplifies the overall stream architecture despite the added information elements.
Solution Approach 2:
The information element structure is designed to be universal, serving multiple functions: it carries DRM processing information, identifies associated media samples, and enables both in-order and out-of-order delivery handling. This multi-functional design reduces the need for separate specialized structures for different delivery modes.
3Loss of time
If DRM processing information is identified for each media sample, then low latency decoding is achieved, but the processing overhead increases
Solution Approach 1:
The patent extracts only the essential DRM processing information needed for each media sample, rather than processing complete DRM datasets. By taking out only the critical elements required for immediate decoding, the system achieves low latency processing while minimizing the computational overhead associated with DRM operations.
Data Source
AI summary
A decoding device includes a communication interface and a processor operably coupled to the communication interface. The communication interface receives at least a portion of a broadcast stream including media data, which includes media samples. The processor identifies information elements containing DRM processing information in the broadcast stream. Each information element is associated with a respective one media sample of the media data. For each information element, the processor also identifies the one media sample that is associated with the information element. The processor further identifies, based on the information element, the DRM processing information for the one media sample. In addition, the processor decodes the one media sample based on the DRM processing information.