DRM Binding Key Segmentation for Content Security
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Solution Overview
Problem
Current digital rights management (DRM) systems have security weaknesses, leading to unauthorized copying and distribution of digital content, which limits content providers' offerings and complicates user experience.
Innovation Solution
A DRM system that binds digital content to specific devices using unique access keys generated from a binding key and content key, employing asymmetric cryptography and public key infrastructure (PKI) for secure authentication and encryption, ensuring only authorized devices can access and play the content, with features like two-way authentication and revocable certificates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DRM systems are used to control digital content, then content security is maintained to some extent, but security weaknesses allow unauthorized copying and distribution
Solution Approach 1:
The DRM system segments the access control mechanism by separating the binding key (stored securely on authorized devices) from the content key (used to encrypt content). This segmentation ensures that even if the content key is compromised, the binding key remains protected, preventing unauthorized copying while maintaining content security.
Solution Approach 2:
The system employs asymmetric cryptography where the binding key and content key serve different functions with asymmetric relationships. The binding key is used to derive access keys for specific devices, while the content key encrypts the content. This asymmetric structure creates security weaknesses resistance because compromising one key does not automatically compromise the other.
2Reliability
If DRM systems limit content access to prevent unauthorized copying, then security is improved, but content providers limit their offerings and user experience becomes complicated
Solution Approach 1:
The binding key serves multiple functions: it authenticates devices, derives content access keys, and enables flexible content distribution. This multi-functionality allows content providers to offer diverse content types and access models without compromising security, as the same binding key infrastructure supports various content delivery scenarios.
Solution Approach 2:
The binding key acts as an intermediary between the content provider and the user's device. It enables secure key derivation without requiring the content provider to directly manage individual device security, thus simplifying the content provider's role while maintaining strong security and enabling versatile content offerings.
3Reliability
If DRM systems use complex authentication mechanisms, then security is enhanced, but ease of operation deteriorates
Solution Approach 1:
The system implements self-service authentication where the user's device automatically uses its binding key to derive content access keys without requiring manual intervention. This self-service mechanism maintains strong security through cryptographic authentication while preserving ease of operation, as users simply need to have the authorized device without needing to understand or configure security settings.
Data Source
AI summary
The present invention relates to digital rights management (DRM) for content that may be downloaded and bound to a storage device. The storage device may be an intelligent storage device, such as a disk drive, or network attached storage. In addition, the storage device is capable of performing cryptographic operations and providing a root of trust. In one embodiment, the DRM employs a binding key, a content key, and an access key. The binding key binds the content to a specific storage and is based on a key that is concealed on the storage. However, the binding key is not stored on the storage with the content. The content key is a key that has been assigned to the content, for example, by a trusted third party. The access key is determined based on a cryptographic combination of the content key and the binding key. In one embodiment, the content is encrypted based on the access key and stored in encrypted form in the storage device.