Video Encryption and DRM Technology

Video Encryption Basics

Video encryption protects video content from unauthorized access and download. In streaming scenarios, encryption is尤为重要 as video data may be intercepted during network transmission. Without the decryption key, intercepted data cannot be played.

HLS Encryption Mechanism

HLS supports two encryption methods:

• AES-128: Encrypts each TS segment with 128-bit AES key. Players need the key to decrypt and play.
• Sample-AES: Encrypts specific samples within segments for finer control.

In M3U8 files, encryption info is specified via #EXT-X-KEY tag with METHOD, URI, and IV.

DRM Technology

DRM (Digital Rights Management) is advanced content protection that controls access permissions. Major DRM systems:

• Widevine: Google's DRM for Chrome, Android, Fire TV.
• FairPlay Streaming: Apple's DRM for Safari, iOS, Apple TV.
• PlayReady: Microsoft's DRM for Edge, Xbox.