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What is DRM?

DRM (Digital Rights Management) is a technology that protects digital content from unauthorized access and copying. It ensures that only authorized users can access the content and enforces the terms of use defined by content owners.

DRM vs CAS

DRM can serve similar purposes as CAS (Conditional Access System), but with key differences:

  • DRM: Requires online license verification and two-way communication
  • CAS: Typically operates over one-directional channels (like satellite or cable)

DRM in Modern Streaming

Modern DRM systems are primarily implemented in these streaming protocols:

  • HLS (HTTP Live Streaming)
  • DASH (Dynamic Adaptive Streaming over HTTP)
  • MSS (Microsoft Smooth Streaming)

While other protocols could theoretically support DRM, they typically don't implement it in practice.

Protocol-Specific DRM Implementation

DASH and MSS

  • Share similar encryption structure
  • Support content repackaging without decryption
  • Use common encryption (CENC) standard
  • Compatible with multiple DRM systems

HLS

  • Uses Apple's proprietary encryption method
  • Requires either:
    • Doubled storage for encrypted content
    • On-the-fly encryption during delivery
  • Less flexible for multi-DRM scenarios

How DRM Works

  1. Content Encryption: Original content is encrypted
  2. License Server: Manages user rights and decryption keys
  3. Client Verification: Authenticates users and devices
  4. Key Delivery: Securely transmits decryption keys
  5. Content Decryption: Authorized playback only

Common DRM Systems

  • Widevine (Google)
  • PlayReady (Microsoft)
  • FairPlay (Apple)
  • ClearKey (Basic DRM for testing)

Benefits of DRM

  • Content protection
  • Revenue security
  • Usage control
  • Rights enforcement
  • Piracy prevention

Implementation Considerations

When implementing DRM, consider:

  • Protocol compatibility
  • Multi-DRM support
  • Performance impact
  • Storage requirements
  • License management
  • User experience

DRM is essential for protecting premium content in modern streaming services, ensuring that content owners can securely distribute their media while maintaining control over its usage.

Flussonic Media Server supports the following DRM systems: EZDRM, DRM Conax, DRM Conax for Nagra, BuyDRM (KeyOS), Widevine, PallyCon, Irdeto, PlayReady, GS DRM, Solocoo