G'day Will (?),
In another thread it was commented in passing that "plot elements" are
copyright. The loosely-formed statement might naturally lead to an idea that you cannot describe the plot of a work. This conclusion would be false.
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Obviously it should be clear, that for the intents of describing a work for a review, you must actually describe it, and you may, just as well describe the first fifteen minutes, as the last, or the entire work. Since a review, or article, or synopsis, is not in-fact substatially similar, *even if* it gives away the entire plotline, there is no copyright infringement. The only time this would be an infringment is when, in fact, you are copying substantially someone else's plot line synopsis. Or in the case where your synopsis essentially *is the primary or motive cause* for people not to purchase the product. I don't know of actually any case where this has been shown to have occurred.
There was a case about two years ago --- my, how time flies! --- where a Wikipedian had written a mutli-sub-page retelling of the story of 2001: A Space Oddysey, interspersed with analysis of the film's themes and the significance of its special effects. Not only did it go into incredible depth of analysis, it also re-told the entire story (quoting every line of dialogue, describing of every action). There was nothing (apart from the spectacle of Kubrick's direction, of course) that could be gained from watching the film that one wouldn't also get from reading the articles.
*That's* a copyright infringement.