Transport Stream Payload Encryption for Smooth Playback
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Solution Overview
Problem
Conventional file-based encryption techniques for viewing content in vehicle information systems impose restrictions on encryption block size, leading to impaired presentation during fast-forward, rewind, and search operations, and prevent pre-scanning for smooth playback.
Innovation Solution
A viewing content conversion system that encrypts only the transport stream payload of the viewing content, allowing the transport stream header to remain unencrypted, enabling smooth presentation and indexing without decrypting the entire content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional file-based encryption techniques are used to protect viewing content, then data security is improved, but presentation smoothness during fast-forward, rewind, and search operations deteriorates
Solution Approach 1:
The patent segments the transport stream into two distinct parts: encrypted payload data and unencrypted header data. This segmentation allows the system to maintain security for the content while preserving accessibility for navigation operations. The headers containing timing and positioning information remain unencrypted, enabling smooth fast-forward, rewind, and search operations without requiring decryption of the entire content stream.
Solution Approach 2:
The patent extracts the header portion from the encrypted content stream and excludes it from encryption. By taking out the header data (which contains essential navigation information) from the encrypted payload, the system enables indexing and search operations to proceed without decryption overhead, while the actual content remains securely encrypted.
2Reliability
If conventional file-based encryption techniques are used to protect viewing content, then data security is improved, but the ability to pre-scan and index content for smooth playback deteriorates
Solution Approach 1:
The transport stream is segmented into encrypted payload sections and unencrypted header sections. The unencrypted headers can be scanned and indexed during content preparation without requiring decryption, significantly reducing content preparation time. The encrypted payloads remain secure while their corresponding headers provide navigation metadata for efficient playback.
Solution Approach 2:
The patent enables preliminary scanning and indexing of unencrypted header data during content loading and preparation phases. This preliminary action on the accessible header portion allows the system to create navigation indexes and metadata structures before playback begins, eliminating the need to decrypt entire content files during preparation.
3Reliability
If entire transport stream is encrypted, then data security is improved, but processing complexity and bandwidth usage deteriorate
Solution Approach 1:
The patent extracts and excludes the header portion from the encryption process, encrypting only the payload data. This reduces processing complexity by eliminating the need to decrypt and re-encrypt header data during playback operations. The unencrypted headers can be processed and transmitted with minimal overhead, reducing overall system complexity while maintaining payload security.
Solution Approach 2:
Instead of encrypting the entire transport stream, the patent applies encryption only to the necessary payload portion while leaving headers unencrypted. This partial encryption approach reduces processing complexity and bandwidth requirements compared to full encryption, while still providing adequate security for the actual content data.
Data Source
AI summary
A packetized transport stream for protecting viewing content from unauthorized access and methods for manufacturing and using same. The transport stream includes a plurality of content frames, each having a frame header and a frame payload. Each frame header includes information for handling the content frame; whereas, the frame payload includes selected viewing content for which protection from unauthorized access is desirable. By encrypting only the frame payload, the header remains unencrypted and can be applied to prepare the encrypted frame payload for presentation. The viewing content thereby can be stored in an encrypted format and can be decrypted on-the-fly as the viewing content is needed for presentation. The combination of the unencrypted frame header and the encrypted frame payload advantageously enables the viewing content to be protected against unauthorized use, copying, and dissemination without impairing the presentation of the viewing content.