Browser DRM Integration Cheat Sheet — EME on every browser

A one-page reference for building a content-protected web player: the EME license handshake (encrypted event → requestMediaKeySystemAccess → createSession → generateRequest → message → POST to the license server → update() → decrypt), the browser→CDM→key-system map (Chrome/Firefox = Widevine com.widevine.alpha, Edge = PlayReady com.microsoft.playready, Safari = FairPlay com.apple.fps, Clear Key = test-only), the robustness→security-level→resolution ladder (SW_SECURE_* = L3/SD, HW_SECURE_DECODE =