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Use HLS when the audience watches and does not answer. Playlists are the unit a CDN can cache, so this is the path for a crowd. Expect about 6–20 seconds of latency on standard HLS. That delay is the trade for scale and for players that already speak HLS. People who need to answer stay on WebRTC. HLS segments can be encrypted with AES-128. See Security. An HLS archive is also one of the recording formats, separate from the live playlist. Plan the watch-only audience around the 6–20 second range for standard HLS.