We're often asked if we can prevent piracy by offering an option that does not allow users to download video files, and streams them over HLS (HTTP Live Streaming). Notably, Gumroad offers this as a feature.
The issue with this feature is that it does not offer any protection to your content whatsoever. "Streaming Only" mode does not, in fact, protect the videos from being pirated. Users can use most free video downloader browser extensions that will read an HLS stream and download the videos locally on your computer.
Currently, ArtStation does not have a "streaming only" feature because it does not offer the protection that sellers are really looking for.