DRM System with Persistent Unencrypted Content Policy
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Solution Overview
Problem
The ease with which digital duplicates can be made without losing quality poses challenges in preventing unauthorized copying and distribution of digital content, as existing technologies struggle to effectively manage rights and restrict access.
Innovation Solution
A digital rights management system that uses encrypted digital content items with decryption keys, where the decryption key is encrypted with a public cryptographic key and can only be accessed by users with the corresponding private key, and includes a policy defining circumstances for decrypting encrypted content into a persistently-unencrypted version.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital content is encrypted to prevent unauthorized copying, then security and copyright protection are improved, but user convenience and accessibility deteriorate
Solution Approach 1:
The system dynamically adjusts the state of digital content between encrypted and unencrypted forms based on licensing conditions. Content can be persistently unencrypted when authorized, providing user convenience, while remaining encrypted when protection is needed, maintaining copyright security. This dynamic state change resolves the contradiction between protection and convenience.
Solution Approach 2:
The encryption state of digital content is changed as a controllable parameter through license management. By changing the encryption parameter from encrypted to unencrypted based on licensing decisions, the system allows flexible control over content accessibility while maintaining security when required, thus resolving the contradiction between copyright protection and user convenience.
2Reliability
If digital content is kept encrypted to maintain security, then unauthorized distribution is prevented, but user satisfaction and content usability deteriorate
Solution Approach 1:
The system provides dynamic control over content encryption state, allowing content to be unencrypted during authorized use periods or under specific conditions. This resolves user dissatisfaction by enabling convenient access while maintaining security through the ability to re-encrypt or control access based on licensing terms.
Solution Approach 2:
The system performs preliminary encryption of digital content before distribution, ensuring security from the outset. Licenses are pre-configured with policies that determine when and how content can be decrypted, allowing the system to proactively prevent unauthorized distribution while planning for authorized use scenarios, thus preventing user dissatisfaction before it occurs.
3Ease of operation
If decryption keys are made accessible to users, then content accessibility is improved, but risk of unauthorized copying increases
Solution Approach 1:
The license acts as an intermediary between the decryption key and the user. Instead of directly providing the decryption key, the system uses a license with embedded policies that mediate access. The license controls under what circumstances the decryption key can be used, allowing content accessibility while preventing unauthorized copying through policy enforcement.
Solution Approach 2:
The accessibility of decryption keys is controlled by changing the state of licensing authorization. When a license grants permission, the decryption key becomes accessible; when restricted, it remains inaccessible. This parameter change in authorization state allows the system to balance content accessibility with prevention of unauthorized copying based on licensing conditions.
Data Source
AI summary
A digital rights management license provides access to a decryption key that can be used to decrypt an encrypted digital content item. The digital rights management license also includes a policy that defines circumstances in which the decryption key is allowed to decrypt encrypted content data for the purpose of creating a persistently-unencrypted version of the content data.