Same issue with YouTube. Unless YouTube provides a specific download link, you cannot legally make a copy of the video, other than watch it on YouTube, as it violates the copyright holders legal rights. Even-though its free to watch. There's no such thing as personal use involving format shifting. In this case, from one digital format (streaming) to another (file). The Copyright office denied any exceptions for doing so in their last review. Look it up.
What one does on their own accord is up to them. But cannot use the Open Roads Forums to facilitate activity which can be deemed as not legal.