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It’s whether the OS has hardware to make the platform “trusted.” Android does by default with Widevine, Windows does by default with TPM and Widevine, Linux does not by default.
“Trusted” here of course means, trusted by the company, not by the user. If it’s a trusted platform, it has a cryptographic key exchange space that the user does not have access to. This prevents a spoofed DRM certificate or other interception of the HD stream, which in theory prevents a stream from leaking.
“In theory” of course, because every piece of content is ripped and available DRM-free as soon as it’s released.
Yeah, I’m sure Finamp and the rest of the Jellyfin options people are recommending do the trick for most people, but I’m really happy with PlexAmp.
It also has Chromecast capability and is to my knowledge the only self-hosted option that does so. Really handy for casting to speaker systems, though I’m guessing many people just use Bluetooth for most off-device playback.