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You can use DRM and html5 video, https://en.wikipedia.org/wiki/Encrypted_Media_Extensions

" This allows the use of HTML5 video to play back DRM-wrapped content such as streaming video services "

Yes, that is what is used with MPEG-DASH and HLS too. But none of the DRM systems implemented (beyond ClearKey) is used on just pure MP4 files. So while EME works in either case, nobody is doing it with the file formats natively supported. It's pretty much always in combination with https://developer.mozilla.org/en-US/docs/Web/API/Media_Sourc...

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