KeySystem: {
Fairplay: "com.apple.fps";
FairplayLegacy: "com.apple.fps.1_0";
Playready: "com.microsoft.playready";
Widevine: "com.widevine.alpha";
} = ...
Type declaration
Readonly Fairplay: "com.apple.fps"
Readonly FairplayLegacy: "com.apple.fps.1_0"
Readonly Playready: "com.microsoft.playready"
Readonly Widevine: "com.widevine.alpha"