past paper N-Screen

0. Problem

(1) Explain the concept of N-Screen service and the types of services provided.
(2) Describe the types and details of development technologies related to N-Screen.
(3) Analyze the N-Screen market from both user and policy perspectives.

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1. Introduction

① Concept / Definition

• N-Screen refers to a multi-device content access model where the same content or service can be seamlessly accessed, synchronized, and shared across multiple screens such as TVs, PCs, tablets, and smartphones.
• The “N” in N-Screen means “multiple” — not limited to two or three devices, but any number of screens.
• Users can start watching or working on one device and continue from the exact point on another without interruption.

② Purpose

• Provide ubiquitous media access regardless of device type or location.
• Enable personalized, cross-platform content delivery for improved user experience.
• Increase content consumption and service stickiness for providers.

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2. Main Body

(1) N-Screen Service Concept & Provided Services

Concept:

• Device Continuity: Switching between devices while maintaining content state.
• Multi-device Synchronization: Real-time update of content status across devices.
• Cross-platform Accessibility: Support for multiple OS and device types.

Typical Services:

1. Video Streaming Continuity (e.g., start watching a movie on TV, continue on smartphone).
2. Cloud-based Document Editing (e.g., Google Docs, Microsoft 365).
3. Game Progress Synchronization across console, PC, and mobile.
4. Integrated Messaging & Notifications synced across devices.
5. Smart Home Control Panels accessible from any device.

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(2) Related Development Technologies – Types & Details

Technology Type	Description	Example
Cloud Storage & CDN (Content Delivery Network)	Centralized storage and distributed delivery for low-latency, high-availability content streaming.	AWS S3 + CloudFront, Akamai
Cross-Platform Frameworks	Enables development across multiple device types and OS with a single codebase.	React Native, Flutter
Adaptive Streaming	Dynamically adjusts video quality based on bandwidth and device.	MPEG-DASH, HLS
User Authentication & SSO	Single sign-on across devices to ensure seamless service access.	OAuth 2.0, OpenID Connect
Data Synchronization Protocols	Keeps user data and states consistent across devices.	WebSockets, MQTT
DRM (Digital Rights Management)	Protects copyrighted content across devices.	Widevine, PlayReady
Device Handoff & Context Awareness	Detects active devices and transfers sessions.	Apple Handoff, Chromecast Casting API

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(3) Market Analysis – User & Policy Perspectives

User Perspective:

• Benefits:

  • Convenience and flexibility — media and services available anytime, anywhere.
  • Personalized and consistent experience across devices.

• Concerns:

  • Data privacy — risk of data exposure during synchronization.
  • Device compatibility — limitations with older or unsupported devices.
  • Network dependency — poor performance in low-bandwidth environments.

Policy Perspective:

• Data Protection Regulations: Compliance with GDPR, CCPA, and local privacy laws.
• Content Licensing: Clear cross-platform rights for copyrighted materials.
• Interoperability Standards: Encouraging adoption of open protocols for fair competition.
• Net Neutrality Considerations: Preventing unfair prioritization of certain N-Screen services.
• Security Policies: Mandating encryption and secure authentication for multi-device services.

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3. Conclusion

Child-Friendly Summary
N-Screen is like magic for your videos, games, or documents — you can start them on your TV, switch to your tablet, and then finish on your phone without starting over. It’s like your content follows you around.

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One-Glance Summary Table

Section	Key Points
Concept	Multi-device seamless content access and synchronization
Services	Video continuity, cloud editing, gaming sync, messaging, smart home control
Technologies	Cloud/CDN, cross-platform dev, adaptive streaming, SSO, DRM, device handoff
User View	Convenience, personalization, but privacy & compatibility concerns
Policy View	Data protection, licensing, interoperability, net neutrality, security mandates

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