Stochastic Multi-Spiral Anti-Piracy for Optical Discs
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Solution Overview
Problem
Existing anti-piracy techniques for optical media rely on maintaining the secrecy of custom copy protection processes and algorithms, which can be compromised by unauthorized manufacturers analyzing authentic discs, allowing them to replicate and mass-produce illegal copies.
Innovation Solution
Implementing a stochastic anti-piracy feature in the form of a multi-spiral structure on optical discs, created during the disc mastering process, which serves as a unique fingerprint for authentication, making it difficult to replicate due to physical limitations of manufacturing equipment, and using encrypted verification parameters for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deterministic copy protection feature is used, then the authentication process is simple and reliable, but the security is compromised because unauthorized manufacturers can discover and replicate the exact method or algorithm by analyzing authentic discs
Solution Approach 1:
The patent applies preliminary action by creating a stochastic multi-spiral structure during the disc mastering process that serves as a unique fingerprint before replication. This pre-established random physical feature cannot be predicted or replicated by unauthorized manufacturers, as it is generated once during mastering and then reproduced identically through the stamping process, providing security before the piracy threat materializes.
Solution Approach 2:
The patent uses copying by creating a master disc with a stochastic multi-spiral structure that is then replicated through the optical disc replication process. The key insight is that the stochastic feature is created once on the master and then copied identically to all pressed discs, allowing authentication without requiring the original master or knowledge of the stochastic pattern generation process.
2Object-affected harmful factors
If the copy protection method is kept secret, then security is maintained, but the complexity of the process and algorithm must be kept hidden, limiting transparency and verification
Solution Approach 1:
The patent extracts the security function from the complex stochastic pattern generation process by creating a physical multi-spiral structure that inherently contains authentication information. Instead of relying on secret algorithms, the security is embedded in the physical structure itself, which can be verified by reading the disc without needing to know how the structure was created or what the generation process was.
Solution Approach 2:
The patent introduces an intermediary - the stochastic multi-spiral structure - that mediates between the mastering process and the authentication process. This physical structure serves as a tangible representation of authentication credentials that can be read and verified without exposing the mastering process or requiring secret knowledge, acting as a bridge that enables security through transparency.
3Object-affected harmful factors
If a stochastic multi-spiral structure is created during mastering, then security is enhanced because the exact structure is hard to replicate, but the manufacturing process becomes more complex
Solution Approach 1:
The stochastic multi-spiral structure is created during the mastering process as a preliminary step before mass production. By establishing the unique fingerprint early in the manufacturing workflow, the structure is then reproduced identically through the stamping process, adding minimal complexity to mass production while maximizing security against replication.
Solution Approach 2:
The patent leverages the optical disc replication process to copy the stochastic multi-spiral structure from the master disc to all pressed discs. The stochastic feature is created once on the master and then replicated through standard optical stamping technology, maintaining manufacturing simplicity while ensuring that unauthorized replication without the master is extremely difficult.
Data Source
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AI summary
Disclosed are techniques and systems for manufacturing an optical disc having a stochastic (i.e., non-deterministic) anti-piracy feature in the form of a multi-spiral structure, and for verifying the feature on the optical disc to authenticate the disc for playback. The multi-spiral structure may be comprised of multiple partially interleaved, and partially overlapping, spiral data tracks formed in a designated area of the optical disc. A process of forming the multi-spiral structure may include forming, in the designated area, a first spiral data track with first track pitch and a second spiral data track with second track pitch that is different than the first track pitch. The multi-spiral structure may be analyzed to determine verification parameters for verifying the multi-spiral structure, and those verification parameters may be encrypted so that they may be subsequently decrypted and used to verify the multi-spiral structure on a disc reading device.