Content Individualization via Multi-Key Encryption Segmentation
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Solution Overview
Problem
The Advanced Access Content System (AACS) sequence key mechanism for content distribution faces inefficiencies in inserting forensic watermarks, leading to capacity overhead and complex video encoding processes, as it requires clip separation and drive seeks, which are not straightforward and result in unnecessary data duplication.
Innovation Solution
A method for content individualization using file formatting and encryption, where a source data set is encrypted with multiple keys, and the encrypted segments are combined to form a final encrypted data set, allowing playback devices to decrypt only authorized segments, while watermarks are used to identify playback devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the AACS sequence key mechanism uses seamless connection and branching with N different segments to insert forensic watermarks, then tracing capabilities are improved, but data duplication increases and capacity overhead occurs
Solution Approach 1:
The content is divided into multiple segments (first part, second part, third part) that are encrypted separately with different keys. Each segment contains a portion of the forensic watermark information, allowing the system to trace playback devices without duplicating entire clips multiple times.
Solution Approach 2:
The patent combines multiple encrypted segments (first encrypted data set, second encrypted data set, third encrypted data set) into a single final encrypted data set. This merging approach consolidates the forensic watermarking information across segments, eliminating the need for separate duplicated clips while maintaining tracing capabilities.
2Measurement precision
If the AACS sequence key mechanism requires clip separation and drive seeks for inserting forensic watermarks, then tracing capabilities are improved, but device complexity and process complexity increase
Solution Approach 1:
The content is divided into multiple segments (first part, second part, third part) that are encrypted separately with different keys. Each segment contains a portion of the forensic watermark information, allowing the system to trace playback devices without duplicating entire clips multiple times.
Solution Approach 2:
The encryption mechanism serves multiple functions simultaneously: it provides security encryption, inserts forensic watermarks, and enables device tracing all within a single unified process. This eliminates the need for separate clip separation and drive seek operations.
3Measurement precision
If the AACS sequence key mechanism puts clips on the disc several times encrypted under different variant keys, then tracing capabilities are improved, but data duplication and capacity overhead increase
Solution Approach 1:
The content is divided into multiple segments (first part, second part, third part) that are encrypted separately with different keys. Each segment contains a portion of the forensic watermark information, allowing the system to trace playback devices without duplicating entire clips multiple times.
Solution Approach 2:
The patent combines multiple encrypted segments (first encrypted data set, second encrypted data set, third encrypted data set) into a single final encrypted data set. This merging approach consolidates the forensic watermarking information across segments, eliminating the need for separate duplicated clips while maintaining tracing capabilities.
Data Source
AI summary
Content individualization, including: encrypting a first part of a source data set using a first key creating a first encrypted data set; encrypting a second part of the source data set using a second key creating a second encrypted data set; encrypting the second part of the source data set using a third key creating a third encrypted data set; and combining the first encrypted data set, the second encrypted data set, and the third encrypted data set to form a final encrypted data set. Key words include watermarking and content individualization.