@trdebunked Hmm… is not an “unauthorised biography” a biography of a person without their permission/consent?
So, if applied in fiction:
* it is an unauthorised biography of a fictional character without that character's permission.
* The character itself, and the life events mentioned in that “unauthorised biography” are based on the Copyrighted work, thus making the fictional [unauthorised] biography itself also unauthorised or unlicensed.
In other words, it still falls as a fanfic. However, if this unauthorised biography of a fictional character was based on a Public Domain, or Attribution ShareAlike, work, then it is no longer a fanfic since PD, BY, BY-SA allows derivative works automatically.
It just becomes a matter of canonicity and continuity.
For example, in “Fifty Shades of Gray”, they had to pull down the original fanfic it was based on; changed the characters; and changed other aspects that might be linked to the original source material (and can potentially become an infringement issue).
So, doing an “unauthorised biography” of a fictional character, since a biography is about a person's life events, then it is unavoidable not to use that character's life events from the source material, which is a copyrighted work. Without a permission/license from the Rightsholder, then it's a fanfic because of its “copyright status”.
Did I understand what you were getting at?
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Re: existing of Copyright law. I'm for abolishing it. But since it is there, we have to work with it for now. Hence, the existing of Public Domain, Attribution (By), and ShareAlike (By-SA) for literary works.