Persistent Household Key for Media Content Sharing
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Solution Overview
Problem
Existing digital video recorder (DVR) systems fail to allow seamless transfer and playback of recorded content across different devices due to device-specific encryption keys, preventing content sharing or migration to new devices within the same subscriber account.
Innovation Solution
Implementing a shared household key tied to a subscriber's account, enabling any device associated with that account to encrypt and decrypt media content, allowing content to be played back across multiple devices without the need for device-specific keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device-specific encryption keys are used to protect recorded content, then content security is improved, but content sharing and device migration become impossible
Solution Approach 1:
The encryption key system is segmented into two distinct components: a persistent household key stored on the server that enables content sharing across devices, and device-specific keys that provide local security. This segmentation allows the system to simultaneously achieve both content security through device-specific authentication and content sharing through the persistent household key mechanism.
Solution Approach 2:
The persistent household key acts as an intermediary between the content and multiple devices. Instead of requiring direct device-specific key matching for content access, the household key serves as a mediator that enables authorized devices to access and share content within the same household, thus resolving the contradiction between security and sharing.
2Reliability
If device-specific encryption keys are used, then content protection is improved, but device replacement and content migration become difficult
Solution Approach 1:
The system performs preliminary actions by provisioning devices with the persistent household key in advance through automated enrollment processes. When a new device is added to the household, it is pre-configured with the persistent key, enabling immediate content access and migration without manual key transfer or complex re-encryption processes.
Solution Approach 2:
The persistent household key is copied and distributed to multiple devices within the same household. This copying mechanism enables content migrated from one device to another to be automatically decrypted and accessed, as both devices possess the same persistent key, thus facilitating easy device replacement while maintaining content protection.
3Ease of operation
If automated key provisioning is implemented, then device setup ease is improved, but system complexity increases
Solution Approach 1:
The key provisioning system operates autonomously through self-service mechanisms. When a device is added to the household, it automatically enrolls and receives the persistent household key without requiring manual intervention from users or administrators. The system self-manages key distribution, storage, and renewal, thereby simplifying user operations while managing the underlying complexity through automated processes.
Data Source
AI summary
A method of enabling media recording compatibility between client devices, comprising provisioning a first client device associated with a subscriber identifier with a household key also associated with the subscriber identifier, receiving a media content stream at the first client device, the media content stream having been encrypted by a content provider, decrypting the media content stream at the first client device, creating a recording with the first client device by digitally recording a portion of the media content stream, encrypting the recording with the household key at the first client device, saving the recording to a memory device, and loading the recording onto a second client device that has also been provisioned with the household key, the second client device also being associated with the subscriber identifier, such that the second client device uses the household key to decrypt and play back the recording.