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docs: add new widevine requirements (#14024)

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Alexander Turinske 2018-11-28 02:53:42 -06:00 • committed by Cheng Zhao
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docs/tutorial/testing-widevine-cdm.md
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In Electron you can use the Widevine CDM library shipped with Chrome browser.
Widevine Content Decryption Modules (CDMs) are how streaming services protect
content using HTML5 video to web browsers without relying on an NPAPI plugin
like Flash or Silverlight. Widevine support is an alternative solution for
streaming services that currently rely on Silverlight for playback of
DRM-protected video content. It will allow websites to show DRM-protected video
content in Firefox without the use of NPAPI plugins. The Widevine CDM runs in an
open-source CDM sandbox providing better user security than NPAPI plugins.
#### Note on VMP
As of [`Electron v1.8.0 (Chrome v59)`](https://electronjs.org/releases#1.8.1),
the below steps are may only be some of the necessary steps to enable Widevine;
any app on or after that version intending to use the Widevine CDM may need to
be signed using a license obtained from [Widevine](https://www.widevine.com/)
itself.
Per [Widevine](https://www.widevine.com/):
> Chrome 59 (and later) includes support for Verified Media Path (VMP). VMP
> provides a method to verify the authenticity of a device platform. For browser
> deployments, this will provide an additional signal to determine if a
> browser-based implementation is reliable and secure.
>
> The proxy integration guide has been updated with information about VMP and
> how to issue licenses.
>
> Widevine recommends our browser-based integrations (vendors and browser-based
> applications) add support for VMP.
To enable video playback with this new restriction,
[castLabs](https://castlabs.com/open-source/downstream/) has created a
[fork](https://github.com/castlabs/electron-releases) that has implemented the
necessary changes to enable Widevine to be played in an Electron application if
one has obtained the necessary licenses from widevine.
## Getting the library
Open `chrome://components/` in Chrome browser, find `Widevine Content Decryption Module`