Receiver Group Segmentation for Pirate Key Tracing
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Solution Overview
Problem
Satellite service providers face significant revenue loss due to piracy, as hackers use 'Wizard' or 'McCormack' hacks to deliver common periodic, program, and content keys to multiple receivers, making it difficult to identify and shut down compromised receivers, as these methods safeguard the compromised identity and prevent forensic tracing.
Innovation Solution
Implementing a system that uses multiple-encryption of content to deliver traceable periodic keys, allowing for the derivation of content keys through Entitlement Control Messages (ECMs), and iteratively isolating pirate receivers by dividing receiver populations into groups with specific decryption keys, enabling forensic tracing and de-authorization of compromised devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common periodic keys are delivered to multiple receivers using the Wizard hack method, then the compromised identity is safeguarded from exposure, but the ability to trace and identify pirate receivers is lost
Solution Approach 1:
The system segments the receiver population into multiple groups, each assigned a unique periodic key. By dividing the large population of receivers into smaller, traceable groups, the system maintains security while enabling identification of pirate receivers through group-level tracing when keys are compromised
Solution Approach 2:
The system implements feedback mechanisms where receivers report back their group identifiers and key reception status to the conditional access server. This feedback loop enables the server to detect when a periodic key has been compromised and trace it back to the specific receiver group, allowing for targeted deauthorization without exposing the overall system identity
2Ease of operation
If a cloned receiver uses a hacked identity to receive periodic keys, then the pirate can access content, but the service provider cannot identify which identity was compromised when keys are leaked
Solution Approach 1:
The system assigns different local qualities (unique periodic keys and group identifiers) to different receiver groups. When a key is compromised, the local quality of the affected group can be identified and traced back to specific receivers, preserving forensic information while allowing legitimate users to continue accessing content without interruption
3Object-affected harmful factors
If the service provider de-authorizes a public ID to shut down cloned receivers, then the pirate investment is invalidated, but all receivers using that ID are affected including legitimate users
Solution Approach 1:
The system segments receivers into distinct groups with unique periodic keys. When piracy is detected in one group, only that specific group can be deauthorized while other groups remain unaffected. This segmentation enables targeted punishment of pirates without disrupting legitimate users, maintaining service continuity for the majority
Solution Approach 2:
The periodic key acts as an intermediary between the service provider and receivers. By compromising or deauthorizing specific periodic keys associated with pirate groups rather than directly targeting receiver identities, the system can eliminate pirate access while preserving legitimate user access through their separate, unaffected periodic keys
Data Source
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AI summary
A method of identifying a receiver device from which pirated video decryption keys have been obtained consistent with certain embodiments involves organizing a population of receiver devices into a plurality of N groups; associating the N groups with a plurality of N decryption keys, where each of the N groups is associated with one of the N decryption keys, where the N decryption keys are used for either decryption of content or decryption of other decryption keys; causing the plurality of N decryption keys to be obtained by their associated N groups of receiver devices by direct delivery or by derivation at the receiver devices; and identifying a pirated key as being associated with one of the N groups so as to identify the receiver device from which the pirated video decryption keys have been obtained as belonging to one of the N groups. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.