Packet Transmitter Encrypting AV Data for IP Network Transmission
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Solution Overview
Problem
Conventional Digital Transmission Content Protection (DTCP) methods are unable to transmit MPEG-TS signals over Ethernet and wireless LAN networks using IP packets, failing to provide digital copyright protection for contents distributed between devices in a home network, and struggle with trick playback functionality.
Innovation Solution
A packet transmitter apparatus that encrypts AV data using DTCP and transmits it over IP packets, employing HTTP and RTP protocols, with features like authentication, encryption mode determination, and timestamp addition to ensure secure and compatible signal transmission between devices, supporting trick playback and various storage formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DTCP method is used for content protection, then copyright protection is improved, but compatibility with IP networks and trick playback functionality deteriorates
Solution Approach 1:
The patent introduces an intermediary encryption information header between the MPEG-TS signal and IP packets. This header contains DTCP encryption information and serves as a mediator that enables secure transmission over IP networks while maintaining compatibility with existing network infrastructure. The intermediary layer allows DTCP-protected content to coexist with standard IP packet transmission.
Solution Approach 2:
The patent segments the transmission process into distinct components: MPEG-TS signal encryption, encryption information header addition, and IP packet transmission. By separating these functions, the system can maintain DTCP protection while adapting to IP network requirements, enabling both secure transmission and network compatibility simultaneously.
2Reliability
If encryption information headers are added to encrypted data, then copyright protection is improved, but processing load increases
Solution Approach 1:
The encryption information header is prepared and added in advance during the encryption process at the transmission end. By performing this preliminary action, the receiving end only needs to extract and process the header information for decryption, significantly reducing the processing burden compared to encrypting every packet individually.
3Reliability
If authentication processing is performed, then security is improved, but transmission time increases
Solution Approach 1:
Authentication processing is performed in advance before the actual content transmission begins. The authentication key exchange and verification are completed preliminarily, allowing the main content transmission to proceed without repeated authentication interruptions, thus minimizing the impact on overall transmission time.
Data Source
AI summary
To provide a packet transmitter apparatus which can transmit contents protected by a content protection technique such as DTCP or the like, using packets such as IP packets which have become widespread.The packet transmitter apparatus includes a transmitting condition setting management unit (404) which extracts at least one of charge information, playback control information and copy control information of AV data from the inputted non-AV data or AV data and generates, based on the extracted information, encryption mode information indicating an encryption mode which becomes a condition at the time of transmitting the AV data; an encrypted data generation unit (406) which generates encrypted data by encrypting, based on the transmitting condition, the inputted AV data and adding encryption information headers based on the encryption mode information to the encrypted AV data; and a packet generation unit (403) which generates packets by adding packet headers to the generated encrypted data. The transmitting condition is to be determined as a combination of input terminal information, data format information and attribute information.