Digital Cinema Distribution System with Back Channel Authentication
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Solution Overview
Problem
The distribution of digital cinema content faces challenges due to large file sizes, which can result in transmission failures and security vulnerabilities, particularly in the absence of a back channel for retransmission and the high value of the content necessitates secure encryption to prevent unauthorized access and copying.
Innovation Solution
A motion picture distribution system comprising a central computer, an exhibitor computer, and a communication channel with a back channel, where the central computer compresses, encodes, and encrypts the digital content, and the exhibitor computer decrypts, decodes, and decompresses it only after authentication, using a smartcard for decryption and employing RAID arrays for file redundancy, along with conditional access systems for security and enhanced error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If digital cinema content is transmitted via satellite or terrestrial distribution methods, then the distribution reach and speed are improved, but the risk of unauthorized reception and copying increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing encryption and authentication mechanisms before transmission. The content is encrypted with keys distributed only to authorized exhibitors through secure key management systems, preventing unauthorized reception and copying before they can occur during distribution via satellite or terrestrial networks
Solution Approach 2:
The patent uses conditional access systems and key management intermediaries between the content source and exhibitors. These intermediaries control decryption keys and authentication credentials, allowing fast distribution while preventing unauthorized access by mediating between the transmitted content and the exhibitor's playback system
2Device complexity
If large digital cinema files are transmitted without a back channel, then transmission simplicity is improved, but the reliability of delivery deteriorates
Solution Approach 1:
The patent implements feedback through a back channel that allows exhibitors to send acknowledgments and status information back to the distribution system. This enables verification of successful reception, reporting of transmission errors, and coordination of key distribution, significantly improving delivery reliability while maintaining relatively simple forward transmission paths
Solution Approach 2:
The system performs preliminary actions by pre-distributing encryption keys and authentication credentials through the back channel before content transmission. This allows the main content transmission to remain simple while ensuring reliability through pre-configured security and error handling capabilities at the exhibitor end
3Reliability
If encryption is applied to protect digital cinema content, then security against piracy is improved, but the processing complexity and time required for decryption increase
Solution Approach 1:
The patent segments the security system into multiple components: content encryption, key management, authentication, and conditional access. Each component operates independently with optimized processing, reducing overall complexity while maintaining strong security. The segmentation allows parallel processing of different security functions without bottlenecking the entire system
Solution Approach 2:
The system uses cryptographic copying where encryption keys are distributed to multiple authorized exhibitors without compromising the original content security. Each exhibitor receives a copy of the decryption key through secure channels, enabling independent decryption without increasing central processing complexity or reducing security
4Loss of time
If digital cinema files are stored at exhibitor locations for later playback, then transmission timing flexibility is improved, but the risk of unauthorized copying increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing watermarks and tracking mechanisms in the distributed content that enable identification and tracing of unauthorized copies. Authentication credentials are tied to specific exhibitor locations and playback equipment, preventing theft and unauthorized copying even when content is stored locally for flexible timing
Solution Approach 2:
The conditional access system acts as an intermediary that controls the relationship between stored content and playback. Even though content is stored at exhibitor locations, the intermediary authentication system must verify credentials before allowing decryption and playback, maintaining security while enabling timing flexibility
Data Source
AI summary
A motion picture distribution system, the system including a central computer, an exhibitor computer, a communication channel, and a back channel. The central computer is located at a central site and configured to distribute a digital version of the motion picture. The exhibitor computer is located at an exhibitor location that is remote from the central site. The exhibitor computer is configured both to receive the digital version of the motion picture from the central computer, and to display the motion picture. The communication channel is configured to facilitate the electronic transfer of the digital version of the motion picture from the central computer to the exhibitor computer. The back channel is coupled between the central computer and the exhibitor computer, and configured to allow for the transfer of information between the exhibitor computer and the central computer.