I've read official and sorta-semi-official adaptations and books that were set in other folk's IP universes but they were perfectly upfront about it. And of course I read fanfiction. LOTS of it, have even written some too. So I pretty much know it when I see it. Couple years back though I got a bit thrown off by one book, an M/M paranormal mystery romance. Less than 10 pages in it was quite obvious that the author, whose name I did NOT recognize from fandom circles and so wasn't expecting it of them, had written a very thinly disguised story based on a 90s TV series, The Sentinel. Had I bought the book instead of borrowing it I'd have been disappointed because frankly, it did not work as well with the serial numbers filed off as they say.
And no, I did not manage to track down the fanfic it was based on, which was probably the better version.
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