@java.lang.Override
    public Builder toBuilder() {
      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
    }
<pre>
Required. Specify the encryption scheme.

Supported encryption schemes:

- `cenc`
- `cbcs`
</pre>

<code>string scheme = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for scheme.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/Encryption.java