private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
          getWidevineFieldBuilder();
          getFairplayFieldBuilder();
          getPlayreadyFieldBuilder();
          getClearkeyFieldBuilder();
        }
      }
<pre>
Defines configuration for DRM systems in use.
</pre>

Protobuf type {@code google.cloud.video.transcoder.v1.Encryption.DrmSystems}
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/Encryption.java