Don't hide the upload button for the published version
On https://dissem.in/p/131018310/ and https://dissem.in/p/131014803/ , the "published version" upload button is not visible and we say that
Published version: archiving forbidden
I don't think it's a good idea to ever hide the upload buttons, because we don't have such precise information about individual articles, not to mention the situation of specific authors or countries where they reside. These two articles for instance are CC BY, so it's perfectly fine to archive them.
Precision of our so-called copyright guidance may or may not improve after the Sherpa/Romeo v2 API is adopted, or possibly in connection with the cataloguing of journals which respect the Plan S retention strategy.