There are plenty of non-fungible goods of this sort that are purely the result of legal constructions. The simplest example is the same movie available from two

There are plenty of non-fungible goods of this sort that are purely the result of legal constructions. The simplest example is the same movie available from two different vendors with separate digital rights systems. If I have purchased rights from one, it does not give me the right to consume the media from the other, even though it is arguably the same work. This means I can multiply the number of non-fungible versions of the same product by making it available on N different competing DRM systems.