Locked-Host Projection with Trusted-Network Availability

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Solution Overview

Problem

Existing computing devices face challenges in securely projecting data from a guest device onto a locked host device, as they are susceptible to unauthorized access when in untrusted networks.

Innovation Solution

A host device determines its network context and broadcasts projection availability only in trusted networks, establishes a projection connection with a guest device while locked, and projects data while maintaining security by preventing access to its own functionalities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the host device broadcasts projection availability in all networks, then the ease of operation is improved, but the security is worsened due to unauthorized access in untrusted networks

Engineering Contradiction:

Improveprojection availabilityVSAvoidunauthorized access

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating network trust levels and applying different projection availability behaviors to different network contexts. The host device evaluates network trustworthiness and selectively enables projection availability only in trusted networks, thereby maintaining security while preserving functionality where appropriate.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the host device remains locked during projection, then the security is improved, but the ease of operation is worsened due to restricted access to functionalities

Engineering Contradiction:

Improveunauthorized accessVSAvoidaccess to functionalities

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent extracts the projection functionality from the locked state restrictions. By allowing projection availability specifically during locked state through trusted networks, the system separates the projection capability from general device access controls, enabling secure projection while maintaining locked state security for other functionalities.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If the host device accepts projection requests from any device, then the adaptability is improved, but the reliability is worsened due to potential security breaches

Engineering Contradiction:

Improveprojection compatibilityVSAvoidsecurity protection

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces network trust evaluation as an intermediary layer between projection requests and device acceptance. This mediator assesses the trustworthiness of incoming projection requests based on network context, allowing the system to maintain high adaptability for trusted devices while protecting reliability by blocking suspicious requests.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4006708B1Projection via a device

Publication Date: 2025.10.29 MICROSOFT TECHNOLOGY LICENSING LLC

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AI summary

Techniques for projection via a device are described. According to various implementations, techniques described herein enable a locked host device to output data projected from another device while the host device remains in a locked state. In at least some implementations, device context for a host device (locked or unlocked) can be considered in determining whether to broadcast availability to receive projected content.