I was thinking about this just now, and I have a hunch it is. Can anyone think of any worthy opponents?
Obviously there’s a lot of ambiguity as to the terms here, but I think a base qualification should be that there ought to be a fairly strong sense, either on the part of the creator or the public, that the resource constitutes a discrete entity. So, “the Library of Congress”: extremely borderline. “the collected works of William Shakespeare”: somewhat borderline. “Rogett’s Thesaurus”: good to go.