A new interface `DEREncodable` is introduced in JDK-8300911 as a preview feature. We retrofit existing classes like `AsymmetricKey` to implement it. The rendered HTML javadoc shows a preview tag on `AsymmetricKey` and claims "AsymmetricKey relies on preview features of the Java platform" and "Programs can only use AsymmetricKey when preview features are enabled". These are not true. An application can use `AsymmetricKey` without enabling preview features as long as it does not touch the `DEREncodable` type.