DRM'd video content uses the same video codecs and containers, but introduces segment encryption during the packaging phase. In most cases, this encryption is within the audio and video samples rather than on the entire segment. Most content is encrypted using MPEG Common Encryption (CENC) - though there are a couple of variants.

Decryption keys are then exchanged using one of the common proprietary DRM protocols, usually Widevine (Google), Playready (Microsoft), or Fairplay (Apple). The CDM (Content Decryption Module) in the browser is then passed the decryption key, so the browser. Can decrypt the content for playback.