@java.lang.Override
    public java.lang.String getScheme() {
      java.lang.Object ref = scheme_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        scheme_ = s;
        return s;
      }
    }
<pre>
Required. Specify the encryption scheme, supported schemes:
- `cenc` - AES-CTR subsample
- `cbcs`- AES-CBC subsample pattern
</pre>

<code>string scheme = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@return The scheme.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/Encryption.java