public Builder setScheme(java.lang.String value) {
        if (value == null) {
          throw new NullPointerException();
        }
        scheme_ = value;
        bitField0_ |= 0x00000001;
        onChanged();
        return this;
      }
<pre>
Required. Specify the encryption scheme.

Supported encryption schemes:

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

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

@param value The scheme to set.
@return This builder for chaining.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/Encryption.java