content-browser-media-cdm_registry_impl.cc.patch

diff --git a/content/browser/media/cdm_registry_impl.cc b/content/browser/media/cdm_registry_impl.cc
index 81936b7601aa72effc5f99a188da72f8b9469568..6886a4e834b0e51f85348758d3eadeac2846d741 100644
--- a/content/browser/media/cdm_registry_impl.cc
+++ b/content/browser/media/cdm_registry_impl.cc
@@ -9,6 +9,10 @@
 #include "content/public/common/cdm_info.h"
 #include "content/public/common/content_client.h"
 
+#if defined(BRAVE_CHROMIUM_BUILD) && defined(OS_LINUX)
+#include <algorithm>
+#endif
+
 namespace content {
 
 // static
@@ -29,6 +33,24 @@ CdmRegistryImpl::~CdmRegistryImpl() {}
 void CdmRegistryImpl::Init() {
   // Let embedders register CDMs.
   GetContentClient()->AddContentDecryptionModules(&cdms_, nullptr);
+#if defined(BRAVE_CHROMIUM_BUILD) && defined(OS_LINUX)
+  // On linux, we want to register widevine cdm to CdmRegistry when users opt
+  // in. Otherwise, widevine is initialized by default w/o user accept.
+  // So, widevine cdm is erased from |cdms_| and it is registered when users opt
+  // in. Also, we try to register it during the startup in
+  // BraveBrowserMainExtraParts::PreMainMessageLoopRun() by checking opted in
+  // prefs.
+  cdms_.erase(
+      std::remove_if(cdms_.begin(), cdms_.end(), [](const CdmInfo& info) {
+        // It would be better to use |kWidevineKeySystem| constant instead of
+        // using "com.widevine.alpha". To use constant, it requires adding
+        // widevine dependency to content module.
+        // However, using this string directly seems fine because it would not
+        // be changed and can avoid additional patching for this.
+        return info.supported_key_system == "com.widevine.alpha";
+      }),
+      cdms_.end());
+#endif
 }
 
 void CdmRegistryImpl::RegisterCdm(const CdmInfo& info) {