Sohu Tech Products

Jul 16, 2025 · Information Security

Mastering FairPlay DRM: Key Management, Prewarming, and Offline Playback on iOS

This article explains DRM fundamentals, the FairPlay workflow, key management methods using AVAssetResourceLoader and AVContentKeySession, tips for handling codec tags, and step‑by‑step guidance for downloading HLS videos with AVAssetDownloadTask and AVAggregateAssetDownloadTask on iOS.