public Builder mergeDrmSystems(
        com.google.cloud.video.livestream.v1.Encryption.DrmSystems value) {
      if (drmSystemsBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && drmSystems_ != null
            && drmSystems_
                != com.google.cloud.video.livestream.v1.Encryption.DrmSystems
                    .getDefaultInstance()) {
          getDrmSystemsBuilder().mergeFrom(value);
        } else {
          drmSystems_ = value;
        }
      } else {
        drmSystemsBuilder_.mergeFrom(value);
      }
      if (drmSystems_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<pre>
Required. Configuration for DRM systems.
</pre>

<code>
.google.cloud.video.livestream.v1.Encryption.DrmSystems drm_systems = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/Encryption.java