Video DRM and licensing

Design the DRM and content-protection system for a premium SVOD service that must satisfy studio licensing (Widevine, FairPlay, PlayReady) across browsers, mobile, and TVs. Content is encrypted once but must play on all device DRMs, license requests peak at millions per hour around a popular premiere, and you must support concurrent-stream limits and offline downloads. Design the encryption/packaging approach, the license server, and how you enforce per-account stream limits without adding playback latency.