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Widevine CDM binaries will be downloaded on supported platforms shortly after application startup. Widevine support will then become available within a few seconds after successful installation on Windows or after the next application restart on other platforms. The CDM files will be downloaded to a "WidevineCdm" directory inside the `CefSettings.user_data_path` directory. Pass the `--disable-component-update` command-line flag to disable Widevine download and installation. Pass the `--component-updater=fast-update` command- line flag to force Widevine download immediately after application startup. See the related issue for additional usage details.
There may be instances where CEF requires changes to the source code for Chromium, Blink or third-party projects that are either not desired by those projects or that have not yet been merged into the source code versions of those projects used by CEF. To address this situation the CEF project adds a patch capability as part of cef_create_projects[.bat|sh] build step. This patch capability works as follows: 1. The CEF developer creates one or more patch files containing all required code changes and places those patch files in the "patches" subdirectory. 2. The CEF developer adds an entry for each patch file in the "patch.cfg" file. 3. When building CEF from source code the patch files are applied by the patcher.py tool via the cef_create_projects[.bat|sh] build step 4. When updating Chromium the patch_updater.py tool is used to update all patch files. See https://bitbucket.org/chromiumembedded/cef/wiki/ChromiumUpdate.md for more information about the update process.