BriskBard, CEF4Delphi, WebView4Delphi, WebUI4Delphi and WebUI4CSharp

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///
// Register the Widevine CDM plugin.
//
// The client application is responsible for downloading an appropriate
// platform-specific CDM binary distribution from Google, extracting the
// contents, and building the required directory structure on the local machine.
// The cef_browser_host_t::StartDownload function and CefZipArchive structure
// can be used to implement this functionality in CEF. Contact Google via
// https://www.widevine.com/contact.html for details on CDM download.
//
// |path| is a directory that must contain the following files:
//   1. manifest.json file from the CDM binary distribution (see below).
//   2. widevinecdm file from the CDM binary distribution (e.g.
//      widevinecdm.dll on on Windows, libwidevinecdm.dylib on OS X,
//      libwidevinecdm.so on Linux).
//   3. widevidecdmadapter file from the CEF binary distribution (e.g.
//      widevinecdmadapter.dll on Windows, widevinecdmadapter.plugin on OS X,
//      libwidevinecdmadapter.so on Linux).
//
// If any of these files are missing or if the manifest file has incorrect
// contents the registration will fail and |callback| will receive a |result|
// value of CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS.
//
// The manifest.json file must contain the following keys:
//   A. "os": Supported OS (e.g. "mac", "win" or "linux").
//   B. "arch": Supported architecture (e.g. "ia32" or "x64").
//   C. "x-cdm-module-versions": Module API version (e.g. "4").
//   D. "x-cdm-interface-versions": Interface API version (e.g. "8").
//   E. "x-cdm-host-versions": Host API version (e.g. "8").
//   F. "version": CDM version (e.g. "1.4.8.903").
//   G. "x-cdm-codecs": List of supported codecs (e.g. "vp8,vp9.0,avc1").
//
// A through E are used to verify compatibility with the current Chromium
// version. If the CDM is not compatible the registration will fail and
// |callback| will receive a |result| value of
// CEF_CDM_REGISTRATION_ERROR_INCOMPATIBLE.
//
// |callback| will be executed asynchronously once registration is complete.
//
// On Linux this function must be called before cef_initialize() and the
// registration cannot be changed during runtime. If registration is not
// supported at the time that cef_register_widevine_cdm() is called then
// |callback| will receive a |result| value of
// CEF_CDM_REGISTRATION_ERROR_NOT_SUPPORTED.
///

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cefclient.exe --enable-widevine-cdm --cache-path=c:\temp\cache

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if GlobalCEFApp.StartMainProcess then
begin
  CefFastRegisterWidevineCdm(ExtractFilePath(Application.ExeName) +'cef\Widevine',OnCDMRegistrationComplete);
  ...
end;

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procedure OnCDMRegistrationComplete(result: TCefCDMRegistrationError; const error_message: ustring);
begin
  showmessage('error');
end;

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  GlobalCEFApp.AddCustomCommandLine('--enable-widevine-cdm', '');
  GlobalCEFApp.AddCustomCommandLine('--cache-path', ExtractFilePath(ParamStr(0)) + 'cef\cache');
  GlobalCEFApp.OnCDMRegistrationComplete := OnCDMRegistrationComplete;
  GlobalCEFApp.WidevinePath := ExtractFilePath(Application.ExeName) +'cef\WidevineCdm';

  if GlobalCEFApp.StartMainProcess then
  ...