@java.lang.Override
    public com.google.protobuf.ByteString getSchemeBytes() {
      java.lang.Object ref = scheme_;
      if (ref instanceof java.lang.String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        scheme_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<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