So... I used to work in the "digital movie & TV selling" industry. Our product detail pages, like pretty much all our competitors, had language on the call-to-action buttons that said "purchase" (and also, as an alternative, "rent," for 48- or 72-hour viewing).

At one point, about 10 years ago, one of the major Hollywood studios came to us and required us to change that because they believed that exactly this sort of thing would happen and we would all be setting ourselves up for liability because consumers would rightfully assume that that meant they owned the movie "forever."